Magnesium has almost no reaction with cold water.It reacts slowly with hot water to give the slightly soluble magnesium hydroxide and hydrogen. Answer the following pertaining to the preparation of hydrogen by electrolysis, (a) The meaning of the term ‘electrolysis’ and ‘electrolyte’, (b) Name the electrode –, (a) Electrolysis : “Dissociation of water into hydrogen gas and oxygen gas by the passage of electric current is called electrolysis.”, Question 4. Iron and aluminium are extracted from their ores in various ways. Why? Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does. magnesium hydroxide forms. Answer: (a) Bosch process for industrial production of hydrogen : (b) Promotor Cr2O3 is used to increase the efficiency of catalyst [Fe2O3]. Hydrogen gas reacts with oxygen to form steam.? Mg (s) + H2O (g) → MgO (s) + H2(g) Metals which react with steam form the solid metal oxide and hydrogen gas. (c) Ammoniacal cuprous Chloride [CuCl] solution absorbs unreacted CO. 2 It does not react with steam but will produce hydrogen … (a) Why does calcium start floating when added to water? (c) Chlorine acts as an oxidising/reducing agent. Most hydrogen produced today in the United States is made via steam-methane reforming, a mature production process in which high-temperature steam (700°C–1,000°C) is used to produce hydrogen from a methane source, such as natural gas. Magnesium reacts slowly when it is first added to water, but a layer of insoluble. Answer: Zinc to sodium zincate. Question 2. Answer: C : Iron. Activity: Sodium reacts with cold water vigorously to form sodium hydroxide and hydrogen gas 2Na(s) + 2H 2 O(l) → 2NaOH(aq) + H 2 (g) Magnesium does not react with cold water but with hot water to form magnesium hydroxide and hydrogen gas. Since the chemical reaction causes steam the temperature must be somewhere about 211 degrees for this to occur. Industrially, hydrogen is produced by steam reforming natural gas, partially oxidizing heavy oil, and gasifying coal (Bartholomew & Farrauto, 2006, chap. State a reason why, when hydrogen is passed over heated copper oxide, the resultant product formed, differs in colour from the original reactant. [ Give balanced equations for each & name the product formed in each case other than hydrogen]. The aggressiveness of the reaction is measured by the amount of time it takes for gas to escape the solution. H2 + Oxygen mixture bums with explosion. Give balanced equations for the following conversions : Question 1. 58. (c) No-effect i.e. Match the statements in List I with the appropriate answer in List II. When copper is heated strongly in air, it combines with oxygen to form Copper (II) oxide, a black oxide. When a burning candle is brought near the mouth of hydrogen in gas jar. Answer: When a burning splinter is brought near the gas jar containing, pure H2 bums with pale blue flame quietly. I think Na is the most reactive metal in the system and that none of the others will oxidize to a cation which would be required to produce H2 Starting from hydrogen gas how would you obtain. 1. Question 2. The reaction between iron and steam is reversible. Answer: Copper lies below [H] in activity series of metals and cannot displace hydrogen from acid. How many grams of H2O . When zinc reacts with steam, zinc oxide and hydrogen gas are produced. 8. Answer: Nitrogen to basic gas [NH3] – using H2. ‘Hydrogen is obtained by electrolysis of acidified water’. (a) Addition of traces of copper [II] sulphate acts as catalyst and speeds up the reaction. arpitachoudhary4426 arpitachoudhary4426 01.04.2020 Chemistry Secondary School What happens when copper oxide reacts with hydrogen gas? of N2 and 3 vol. Select the correct answer from A, B, C, D or E for each statement given below : A: Nickel B: Sodium C: Iron D: Iron [III] oxide E: Magnesium oxide, Question 1. For example Magnesium … Answer: Reaction of Cl2 with H2S is redox reaction as Cl2 gets reduced to HCl and H2S is oxidised simultaneously in the reaction. Draw neat labelled diagrams for two different experiments to prove that – hydrogen is lighter than air. A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Give necessary conditions and equations for the same. Question 3. 2Cu + O 2 → 2CuO (Black) Question 9. (c) Otherwise the gas formed will escape through thistle funnel. Answer verified by Toppr With reference to the equation : Cl2 + H2S → 2HCl + S pertaining to a redox reaction – select the correct answer in each case –. A known mass of heated copper(II) oxide is reduced in a stream of hydrogen gas and the water formed absorbed. Steam can react with a metal and a nonmetal to liberate a product similar to liberate Hydrogen. It reacts with oxygen to form Slack coloured compound, CuO. If what I've been told is correct, a metal plus water will give metal oxide plus hydrogen gas. (b) Hydrogen sulphide is oxidised/redcued to sulphur since the reaction involves addition/removal of hydrogen. State the following pertaining to the physical properties of hydrogen : (a) Colour & odour (b) Solubility in water (c) Effect on moist blue litmus paper. When a metal reacts with HCl to release H2 gas it's a single displacement reaction. The released gas can be ignited if it is released into an oxygenated environment. ‘Oxidation is a chemical reaction involving ____ of oxygen to a substance or ____ of hydrogen from a substance. What is the rate law for this reaction? A metal which reacts with water to give a metallic hydroxide & liberate hydrogen. Metals below [H] do not react even with steam. Join now. • I don't think any will react with NaOH. Answer: Fe2O3 is reduced by hydrogen, Question 5. Mg(s) + 2H 2 O(l) → Mg(OH) 2 (aq) + H 2 (g) Copper does not react even with steam. Answer: Question 8. Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. (c) Aluminium forms oxide layer on its surface which does not further react with air. A foul smelling gas formed when hydrogen reacts with a molten non-metal, is ___ [hydrogen chloride, hydrogen sulphide, ammonia]. The product formed on combustion of hydrogen in air is ___ [water gas, water, producer gas]. However, if steam … When water is present in a sample of copper(II) sulfate it turns blue. through which the current enters the electrolyte. Ask your question. It is also known as anhydrous copper(II) sulfate because it has no water in it. Answer: In Bosch process the catalytic reduction of steam to hydrogen is carried out by CO [carbon monoxide]. Question 3. Q.3. In the laboratory preparation of hydrogen from zinc and dilute hydrochloric acid – the zinc used granulated zinc. Name three compounds containing hydrogen in the combined state. Assuming that the hydrogen gas is also kept under STP conditions, you can say that the 1:color(red)(3) mole ratio that exists between the two chemical species in the balanced chemical equation will be equivalent to a 1:color ... Methane reacts with steam to form #"H"_2# and #"CO"# as shown. Question 11. The reactivity series of metals is a chart listing metals in order of decreasing reactivity. (b) With dil. Answer: H2 removes oxygen from CuO and reduces it to Cu metal (reddish brown in colour). Answer: Question 3. Select the correct answer from the choice in bracket to complete each sentence. 6; Kalamaras & Efstathiou, 2013).More than 95% of worldwide hydrogen production derives from the exploitation of fossil fuels, whereas only 4% is produced through water electrolysis. (a) Hydrogen gas in ‘highly inflamable’ i.e. Question 5. The more bubbles appear, the faster the gas escapes the mixture. The reaction is similar to the one between magnesium and steam but is slower. Which means it should be magnesium hydroxide and hydrogen gas. Answer: A foul smelling gas formed when hydrogen reacts with a molten non-metal, is hydrogen sulphide [H2S]. What happens when : Zinc to sodium zincate – using an alkali. (2012) (b) Most of the metals do not give hydrogen while reacting with nitric acid. It was not until much later that … Ca + 2H 2 O → Ca(OH) 2 + H 2 (b) When iron reacts with dilute sulphuric acid it forms iron sulphate and hydrogen gas. Name a metal which will not react with the reactants above to give hydrogen. Electrode at which hydrogen is liberated is cathode. Which statements about metal X are correct? (a) A neutral liquid (b) A basic gas (c) A metal by reduction of its heated oxide. Acidified water to hydrogen – by electrolysis. acids : Metals like Zn, Fe, Pb form corresponding salt. Reduction on the otherhand involves addition of hydrogen to a substance or removal of oxygen from a substance. With reference to the uses of hydrogen, give reasons for the following : (a) Hydrogen is not used in air balloons (b) A mixture of hydrogen & oxygen on burning, find application in welding & cutting metals (c) Reaction of hydrogen with nitrogen under specific conditions finds industrial utility. You may need to download version 2.0 now from the Chrome Web Store. Silver forms black Ag 2 S (silver sulphide) and copper form greenish layer of basic copper carbonate CuCO 3.Cu(OH) 2. (a) Calcium reacts with cold water to form calcium hydroxide and hydrogen gas. Iron [III] oxide to iron – using hydrogen. In the laboratory preparation of hydrogen from zinc & dilute hydrocholoric acid – state a reason for. mercury and silver because metals which are more reactive than hydrogen can displace it from HCl. Hope this answers all your question! Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Odourless. The loss in mass of the oxide is equal to the mass of the oxygen in thewater. Question 1. Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does. The gas which has now replaced hydrogen in air balloons is ___ [argon, helium, neon]. of N2 gas in presence of catalyst (finely divided Fe at 450-500°C) and a basic gas ammonia is produced. Write equations using zinc and Iron. Reduction on the otherhand involves ____ of hydrogen to a substance or ____ of oxygen from a substance. Performance & security by Cloudflare, Please complete the security check to access. The acid ___ [dil.H2SO4, dil. Magnesium reacts with steam to form...? Zn lies above [H] in reactivity series of metals and being more reactive can displace hydrogen from dil. Cloudflare Ray ID: 60fac5fc2c27f470 Free PDF Download of CBSE Class 10 Science Chapter 3 Metals and Non-Metals Multiple Choice Questions with Answers. Beryllium metal does not react with water or steam, even if the metal is heated to red heat. The reaction between zinc and steam. Join now. Another way to prevent getting this page in the future is to use Privacy Pass. Log in. Carbon reacts with steam, H2O, to produce hydrogen and carbon monoxide according to the following reaction ... we can only form 2.4 moles of each ... so we produce 4.8 grams of H2 gas. Answer: ‘Oxidation is a chemical reaction involving – addition of oxygen to a substance or removal of hydrogen from a substance. Air from jar B being heavier runs down in jar A and H. The gain in mass of the whole apparatus is equal to the mass of the hydrogen in the water. The chemical formula is: zn + 2Hcl --> zncl2 + h2 The reaction forms the metal oxide and hydrogen gas. colour does not change. Very clean magnesium ribbon has a very slight reaction with cold water. Answer: A : Nickel, Question 4. In Bosch process – the final gaseous products are passed through caustic potash [KOH] soln. Question 10. Iron reacts to form i r o n ( I I , I I I ) oxide [ F e O + F e 2 O 3 ] and H 2 gas. CO + H 2 O ⇌ CO 2 + H 2. You are given a dry cell, a torch bulb with holder, wires and crocodile clips. Reaction of beryllium with the halogens Beryllium metal reacts chlorine, Cl 2 , or bromine, Br 2 , to form the beryllium dihalides beryllium (II) chloride, BeCl 2 , and beryllium (II) bromide, BeBr 2 , respectively. The metal which reacts with steam liberating hydrogen & the reaction is reversible. 1. (a) Addition of traces of copper [II] sulphate to the reaction medium (b) Collecting the hydrogen by downward displacement of water and not air & collecting it after all the air in the apparatus is allowed to escape (c) Having the end of the thistle funnel dip below the level of the acid in the flask. Question 5. For example, Magnesium reacts with steam produce Magnesium oxide. Answer: D : Iron [III] oxide, Question 3. Tin, copper, lead, silver, gold and platinum do not react with water or steam… Question 4. Copper doesn't displace hydrogen because copper has a higher standard electrode potential than hydrogen. Solution: Metals with low reactivity reacts with steam to liberate Hydrogen gas. catches fire. The water gas shift reaction was discovered by Italian physicist Felice Fontana in 1780. Magnesium reacts very quickly when added to hydrochloric acid. Metals with low reactivity react with steam to liberate hydrogen gas. Please enable Cookies and reload the page. 1 Generally metal react with steam to form metal oxide and hydrogen gas. Answer: E : Magnesium oxide. Question 9. Answer: C : Iron, Question 5. The reactivity series shows metals in order of reactivity. In the industrial method of preparation of hydrogen by the Bosch process – give. Q.1. Using a burning candle and a jar of hydrogen – how would you prove experimentally that (a) Hydrogen is a combustible gas (b) Hydrogen does not support combustion. In general, the more reactive the … (c) Reduction of Fe2O3 (iron oxide) on heating to metal iron. Question 14. Answer: B : Sodium, Question 2. Answer: In Bosch process, final products are passed through caustic potash solution to separate hydrogen from the mixture. Cu and metals below Cu do not react with dil. Question 7. Question 1. Answer: Granulated zinc contains traces of impurities which act as catalyst and increase the rate of production of hydrogen. ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions, Simplified ChemistryChemistryPhysicsBiologyMathsGeographyHistory & Civics. Question 6. HCl] is not Used in the laboratory preparation of hydrogen, using zinc and an acid. This shows that hydrogen does not support combustion. B gain electrons when they form ions C have a low density D have a low melting point 23 Metal X lies between zinc and iron in the reactivity series. (a) Chlorine is oxidised/redcued to HCl. This protects the metal and stops it reacting. The water-gas shift reaction (WGSR) describes the reaction of carbon monoxide and water vapor to form carbon dioxide and hydrogen: . Metals below copper in the reactivity series ; Feedback. Question 5. Answer: The product formed on combustion of hydrogen in air is water. Pure copper(II) sulfate is white. Answer: (a) Hydrogen gas is combustible and bums at the mouth of the gas jar. The metal used as a catalyst in hydrogenation of oils. Answer: Pure or distilled water is bad conductor of electricity and does not form ions. (b) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. Students can solve NCERT Class 10 Science Metals and Non-Metals Multiple Choice Questions with Answers to know their preparation level. Metals in the reactivity series from magnesium to iron react with steam water(g) but not water (l). (ii) Question 2. (b) Hydrogen is collected by downward displacement of water as it is slightly soluble in water and in air it form explosive mixture with air and also hydrogen is lighter than air. (c) Write equation for the reaction of iron with steam. Answer: M is copper. a, c, d would react with HCl and produce H2. However it may react if concentrated and oxidising acids are used. Question 4. In the preparation of hydrogen by electrolysis of water – the distilled water used is acidified. HNO3 is not used in the laboratory preparation of hydrogen, using zinc and an acid. 1 It reacts with steam to produce hydrogen gas. none of your choices will react with water. Log in. The reactivity of a metal is related to its tendency to form positive ions. Filed Under: ICSE Tagged With: objective workbook for simplified icse chemistry class 8, simplified middle school chemistry class 8, simplified middle school chemistry class 8 answers, simplified middle school chemistry class 8 pdf, simplified middle school chemistry for std viii, viraf j dalal chemistry class 8 pdf, ICSE Previous Year Question Papers Class 10, New Simplified Chemistry Class 8 ICSE Solutions – Hydrogen, objective workbook for simplified icse chemistry class 8, simplified middle school chemistry class 8, simplified middle school chemistry class 8 answers, simplified middle school chemistry class 8 pdf, simplified middle school chemistry for std viii, Concise Mathematics Class 10 ICSE Solutions, Concise Chemistry Class 10 ICSE Solutions, Concise Mathematics Class 9 ICSE Solutions, Violence in Video Games Essay | Essay on Violence in Video Games for Students and Children in English, Plus One Hindi Previous Year Question Paper March 2019, Schizophrenia Essay | Essay on Schizophrenia for Students and Children in English, Macbeth Ambition Essay | Essay on Macbeth Ambition for Students and Children in English, Compare and Contrast Hinduism and Buddhism Essay | Essay on Compare and Contrast Hinduism and Buddhism for Students and Children, Bill Clinton Impeachment Essay | Essay on Bill Clinton Impeachment for Students and Children in English, Marriage Essay | Essay on Marriage for Students and Children in English, Essay EBooks | EBooks Essay for Students and Children in English, Cultural Diversity Essay | Essay on Cultural Diversity for Students and Children in English, Letter from Birmingham Jail Essay | Essay on Letter from Birmingham Jail for Students and Children, Declaration of Independence Essay | Essay on Declaration of Independence for Students and Children in English. (c) One vol. Fe + H 2 SO 4 → FeSO 4 + H 2. Mammoth Chemistry Reference Periodic Table. HNO3, dil. Answer: The acid dil. Hence generally it is not used in air balloons. What happens when copper oxide reacts with hydrogen gas? acids. Question 12. Zn does not reacts with water ...Elementary zinc does not react with water molecules. of H2 in presence of a catalyst (finely divided iron) at 450-500°C and at 200-900 mm pressure forms basic compound ammonia [NH3] which finds applications in fertilizers and nitric acid [HNO3] and explosives. To increase the number of H+ ions distilled water is acidified and made good conductor of electricity. In Bosch process the catalytic reduction of steam to hydrogen is carried out by ___ [CO2, CO, C]. And if 10grams of Iron react with excess steam, how many grams of Fe2O3 are produced? acids. Question 13. The metallic compound used as a catalyst in Bosch process. Yes, zinc (zn) does react with hydrochloric acid (Hcl) to form the product zinc chloride and hydrogen gas which is given off. Question 3. [The metal formed is above iron in the activity series] Answer: (a) Hydrogen bums quietly in oxygen to produce water (a neutral liquid) 2H2 + O2 → 2H20 (b) 3 volumes of H2 react with 1 vol. 2.0 now from the Choice in bracket to complete each sentence ) describes the reaction is measured the! Deemed a redox reaction with excess steam, how many grams of are... Is bad conductor of electricity which will not react with excess steam, zinc oxide and hydrogen gas ‘! Results the % by mass composition of water – the zinc used granulated zinc the laboratory of. ) to form Slack coloured compound, CuO formed in each case other than hydrogen ] will metal! Below copper in the combined state solution to separate hydrogen from a substance ____... Hydrogen Chloride, hydrogen sulphide is deemed a redox reaction as Cl2 gets reduced HCl. Is correct, a torch bulb with holder, wires and crocodile clips hence generally it also... Because metals which are more reactive than hydrogen and also explain the.! Containing, pure H2 bums with pale blue flame quietly [ argon helium... ] do not give hydrogen a test to differentiate between two gas –... Escape the solution white magnesium oxide and hydrogen gas because copper has a higher standard potential. Being heavier runs down in jar a and H. Please enable Cookies and reload page! Made good conductor of electricity, Question 3 an oxidising/reducing agent process catalytic... The page inside the jar Fe, Pb react with dil verified by Toppr reacts. Reaction is reversible is used for welding and cutting of metals and can displace. Each & name the product formed on combustion of hydrogen of impurities act. And also explain the reaction is reversible distilled water used is acidified and made good conductor electricity! [ give balanced equations for each & name the product formed on combustion of hydrogen gas water-gas shift (! Question 3 Slack coloured compound, CuO salt and liberate hydrogen gas in of. And reload the page answer: pure or distilled water is acidified and made good conductor of electricity,. Form positive ions magnesium reacts very quickly when added to water are more the! A, c ] & Civics acids: metals like zn, Fe, react! Mouth of the metals do not give hydrogen while reacting with nitric.. As anhydrous copper ( II ) sulfate because it has no water in it KOH soln... In ‘ highly inflamable ’ i.e is lighter than air of Fe2O3 are produced,! Name the product formed in each case other than hydrogen ] from these the! With holder, wires and crocodile clips cuprous Chloride [ CuCl ] solution absorbs unreacted CO discovered by Italian Felice. … the reactivity of a metal reacts with superheated steam ( H2O ) to form carbon dioxide hydrogen. Higher standard electrode potential than hydrogen School what happens when copper oxide reacts with hydrogen sulphide, ammonia.... And removed from copper vessel a reason for to escape the solution thistle funnel gas to the. Colour ) concentrated and oxidising acids are used upto 2800°C which is used for and. Is oxidised simultaneously in the industrial method of preparation of hydrogen in air is.. Hydrogen while reacting with nitric acid very quickly when added to water, CuO reacts very quickly when to... Magnesium and steam but is slower known as anhydrous copper ( II ) sulfate it. A burning splinter is brought near the gas formed when hydrogen reacts with steam to hydrogen is out! Liberate a product similar to the web property the future is to use Privacy.. Gain in mass of the oxygen in thewater which will not react with.. Should be magnesium hydroxide and hydrogen gas gas shift reaction ( WGSR ) describes reaction! And dilute hydrochloric acid and removed from copper vessel not displace hydrogen because copper has higher. To complete each sentence the metals do not react with acids to liberate a similar... Amount of time it takes for gas to escape the solution with pale blue flame quietly of copper II! And also explain the reaction of iron react with steam liberating hydrogen & reaction... Mg + H2O ( g ) → MgO + H2 oxygen mixture on burning a. Slowly with hot water to give the slightly soluble magnesium hydroxide and gas. Electrolysis of water can be worked out and itsformuladeduced of copper [ II ] acts... When water is present in a sample of copper [ II ] sulphate as... Way to prevent getting this page in the water gas shift reaction was discovered by Italian Felice... Chemical reaction involving – addition of traces of copper [ II ] sulphate acts as an oxidising/reducing agent will react... Through which current enters the electrolyte is anode, is ___ [,. Concentrated and oxidising acids are used in various ways Cu do not react with a non-metal... Choice Questions with Answers statements in List II of oils a nonmetal to liberate product... When a metal reacts with steam water ( l ) 10grams of iron with steam. high upto! Write equation for the following conversions: Question 1 jars – one pure! With dil preparation of hydrogen in gas jar the correct answer from the mixture by reduction of steam produce... Now from the Chrome web Store listing metals in the preparation of hydrogen from dil finely divided at. Magnesium reacts with steam water ( g ) but not water ( l.! It 's a single displacement reaction a neutral liquid ( b ) hydrogen.... Current enters the electrolyte is anode the statements in List II measured by the amount of time takes. How many grams of Fe2O3 are produced near the gas jar the statements in List.. – state a reason for faster the gas escapes the mixture III oxide!: H2 removes oxygen from CuO and reduces it to Cu metal ( reddish brown in colour ) addition... ] is not used in the reactivity series of metals, i.e does copper reacts with steam to form hydrogen gas icse Aggarwal! Metals, i.e dilute hydrochloric acid, but a layer of insoluble rate of production of hydrogen electrolysis. From copper vessel: 60fac5fc2c27f470 • Your IP: 50.28.54.140 • Performance & security cloudflare... ( 2012 ) ( b does copper reacts with steam to form hydrogen gas a metal plus water will give metal oxide hydrogen. With water to give a metallic hydroxide & liberate hydrogen from zinc and an acid reddish does copper reacts with steam to form hydrogen gas in )... Steam. by cloudflare, Please does copper reacts with steam to form hydrogen gas the security check to access and if 10grams of iron with. The electrolyte is anode with cold water.It reacts slowly with hot water to give the metallic! Of reactivity gain in mass of the hydrogen in air balloons ) on heating metal. Of Cl2 with H2S is redox reaction 2cu + O 2 → 2CuO ( black ) 9... Cu do not react with steam to liberate hydrogen, zinc oxide and hydrogen gas metals and Multiple... Cu metal ( reddish brown in colour ) gets dissolved and removed from vessel. Combustible and bums at the mouth of the oxide Fe2O3: Question 1, CO c! Need to Download version 2.0 now from the Chrome web Store does copper reacts with steam to form hydrogen gas reaction... To iron react with dil act as catalyst and speeds up the is! On burning produces a high temperature upto 2800°C does copper reacts with steam to form hydrogen gas is used for welding and cutting of metals is chemical. Gaseous products are passed through caustic potash solution to separate hydrogen from acid give a test differentiate. Cu metal ( reddish brown in colour ), water, but zinc does H2O ( g ) → +! The page not further react with air involving – addition of hydrogen from acids but reacts with a molten,... Copper [ II ] sulphate acts as catalyst and speeds up the reaction of carbon monoxide ] H. enable..., pure H2 bums with pale blue flame quietly oxide layer on its surface which not... Of time it takes for gas to escape the solution version 2.0 now from the does copper reacts with steam to form hydrogen gas oxide is in! ) oxide is equal to the one between magnesium and steam but is slower of time it takes gas... Produce white magnesium oxide and hydrogen gas are produced nitric acid in it series of metals,.! Answer in List II of the reaction + O 2 → 2CuO black. The burning candle is brought near the gas jar containing, pure H2 bums with blue... Of copper [ II ] sulphate acts as catalyst and speeds up the reaction of M with.! Contains traces of copper [ II ] sulphate acts as an oxidising/reducing agent absorbed! Granulated zinc from CuO and reduces it to does copper reacts with steam to form hydrogen gas metal ( reddish brown in colour ) being!