Give balanced equations for the following conversions : Question 1. CO2 dissolves in KOH leaving behind hydrogen. The aggressiveness of the reaction is measured by the amount of time it takes for gas to escape the solution. State a reason why, when hydrogen is passed over heated copper oxide, the resultant product formed, differs in colour from the original reactant. State the following pertaining to the physical properties of hydrogen : (a) Colour & odour (b) Solubility in water (c) Effect on moist blue litmus paper. The gas which has now replaced hydrogen in air balloons is ___ [argon, helium, neon]. Copper is unreactive and will not react with acids to liberate hydrogen gas. Since the chemical reaction causes steam the temperature must be somewhere about 211 degrees for this to occur. Question 3. Tin, copper, lead, silver, gold and platinum do not react with water or steam… Join now. The reaction between zinc and steam. Generally metal react with steam to form metal oxide and hydrogen gas. Hydrogen gas reacts with oxygen to form steam.? Answer: Fe2O3 is reduced by hydrogen, Question 5. Fe + H 2 SO 4 → FeSO 4 + H 2. In the laboratory preparation of hydrogen from zinc & dilute hydrocholoric acid – state a reason for. Log in. (c) Otherwise the gas formed will escape through thistle funnel. (a) Calcium reacts with cold water to form calcium hydroxide and hydrogen gas. In the preparation of hydrogen by electrolysis of water – the distilled water used is acidified. Why? 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. (write) Balance this chemical reaction. Metals below copper in the reactivity series ; Feedback. magnesium hydroxide forms. CO + H 2 O ⇌ CO 2 + H 2. A metal which reacts with water to give a metallic hydroxide & liberate hydrogen. (a) Balanced equations for the first two main steps in the production of hydrogen (b) The reason for use of addition of a promoter to the catalyst in the final step (c) The name of the solution which absorbs the unreacted carbon monoxide. of N2 gas in presence of catalyst (finely divided Fe at 450-500°C) and a basic gas ammonia is produced. Question 4. And if 10grams of Iron react with excess steam, how many grams of Fe2O3 are produced? Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does. Performance & security by Cloudflare, Please complete the security check to access. Zn, Fe and Pb react with steam and form corresponding oxides. Ca + 2H 2 O → Ca(OH) 2 + H 2 (b) When iron reacts with dilute sulphuric acid it forms iron sulphate and hydrogen gas. When water is present in a sample of copper(II) sulfate it turns blue. Answer: A : Nickel, Question 4. Iron reacts with superheated steam(H2O) to form hydrogen gas and the oxide Fe2O3. The reaction forms the metal oxide and hydrogen gas. Answer: ‘Oxidation is a chemical reaction involving – addition of oxygen to a substance or removal of hydrogen from a substance. (c) No-effect i.e. The metal used as a catalyst in hydrogenation of oils. Magnesium reacts slowly when it is first added to water, but a layer of insoluble. (b) Hydrogen extinguishes the burning candle when pushed inside the jar. Question 10. a) dilute sulphuric acid (b) dilute hydrochloric acid . Answer: Nitrogen to basic gas [NH3] – using H2. Question 1. The chemical formula is: zn + 2Hcl --> zncl2 + h2 In Bosch process – the final gaseous products are passed through caustic potash [KOH] soln. 1 It reacts with steam to produce hydrogen gas. Iron [III] oxide to iron – using hydrogen. Your IP: 50.28.54.140 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. The reaction between iron and steam is reversible. Question 14. Q.4. 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 6. Question 1. acids : Metals like Zn, Fe, Pb form corresponding salt. (b) With dil. Question 5. (c) Aluminium forms oxide layer on its surface which does not further react with air. HNO3 is not used in the laboratory preparation of hydrogen, using zinc and an acid. (b) Hydrogen sulphide is oxidised/redcued to sulphur since the reaction involves addition/removal of hydrogen. Answer: The product formed on combustion of hydrogen in air is water. Ask your question. Answer: In Bosch process the catalytic reduction of steam to hydrogen is carried out by CO [carbon monoxide]. Question 12. Write equations using zinc and Iron. Steam can react with a metal and a nonmetal to liberate a product similar to liberate Hydrogen. Zn does not reacts with water ...Elementary zinc does not react with water molecules. This protects the metal and stops it reacting. However it may react if concentrated and oxidising acids are used. 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The acid ___ [dil.H2SO4, dil. What happens when : (ii) Question 2. Metals below [H] do not react even with steam. Answer: H2 removes oxygen from CuO and reduces it to Cu metal (reddish brown in colour). When a metal reacts with HCl to release H2 gas it's a single displacement reaction. Which means it should be magnesium hydroxide and hydrogen gas. Electrode at which hydrogen is liberated is cathode. A foul smelling gas formed when hydrogen reacts with a molten non-metal, is ___ [hydrogen chloride, hydrogen sulphide, ammonia]. 1. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. If what I've been told is correct, a metal plus water will give metal oxide plus hydrogen gas. Question 3. Cu and metals below Cu do not react with dil. Answer: The acid dil. Iron and aluminium are extracted from their ores in various ways. Hence it is redox reaction. You may need to download version 2.0 now from the Chrome Web Store. In the laboratory preparation of hydrogen from zinc and dilute hydrochloric acid – the zinc used granulated zinc. Copper does not displace hydrogen from dilute hydrochloric acid, but zinc does. Question 5. Please enable Cookies and reload the page. Answer: M is copper. Hydrogen is obtained by displacement from . Answer: (a) Hydrogen gas is combustible and bums at the mouth of the gas jar. Log in. Metals in the reactivity series from magnesium to iron react with steam water(g) but not water (l). (2012) (b) Most of the metals do not give hydrogen while reacting with nitric acid. 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. 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 The water-gas shift reaction (WGSR) describes the reaction of carbon monoxide and water vapor to form carbon dioxide and hydrogen: . Select the correct answer from the choice in bracket to complete each sentence. (a) Addition of traces of copper [II] sulphate acts as catalyst and speeds up the reaction. (b) Slightly soluble in water. Acidified water to hydrogen – by electrolysis. When a burning candle is brought near the mouth of hydrogen in gas jar. In Bosch process the catalytic reduction of steam to hydrogen is carried out by ___ [CO2, CO, C]. The metallic compound used as a catalyst in Bosch process. Answer: In Bosch process, final products are passed through caustic potash solution to separate hydrogen from the mixture. mercury and silver because metals which are more reactive than hydrogen can displace it from HCl. Match the statements in List I with the appropriate answer in List II. HNO3, dil. How many grams of H gas? Industrially, hydrogen is produced by steam reforming natural gas, partially oxidizing heavy oil, and gasifying coal (Bartholomew & Farrauto, 2006, chap. 8. This shows that hydrogen does not support combustion. Nitrogen to a basic gas – using hydrogen. Question 3. Cloudflare Ray ID: 60fac5fc2c27f470 Answer: (a) Bosch process for industrial production of hydrogen : (b) Promotor Cr2O3 is used to increase the efficiency of catalyst [Fe2O3]. Get the answers you need, now! 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. Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture. The loss in mass of the oxide is equal to the mass of the oxygen in thewater. (b) Tamarind contains acid which reacts with basic copper carbonate and product gets dissolved and removed from copper vessel. Pure copper(II) sulfate is white. Solution: Metals with low reactivity reacts with steam to liberate Hydrogen gas. Which statements about metal X are correct? Answer: Reaction of Cl2 with H2S is redox reaction as Cl2 gets reduced to HCl and H2S is oxidised simultaneously in the reaction. You are given a dry cell, a torch bulb with holder, wires and crocodile clips. Another way to prevent getting this page in the future is to use Privacy Pass. • Question 9. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Answer: C : Iron, Question 5. 1 … 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. Answer: The gas which has now replaced hydrogen in air balloons is helium. through which the current enters the electrolyte. Answer: Granulated zinc contains traces of impurities which act as catalyst and increase the rate of production of hydrogen. Mammoth Chemistry Reference Periodic Table. Name a metal which will not react with the reactants above to give hydrogen. Identify M and black coloured product and also explain the reaction of M with oxygen. Question 13. Reduction on the otherhand involves ____ of hydrogen to a substance or ____ of oxygen from a substance. Answer: D : Iron [III] oxide, Question 3. Answer: Zinc to sodium zincate. The metal which reacts with steam liberating hydrogen & the reaction is reversible. Hence generally it is not used in air balloons. A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. none of your choices will react with water. When zinc reacts with steam, zinc oxide and hydrogen gas are produced. Question 2. 58. 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. of N2 and 3 vol. Magnesium reacts with steam to form...? Silver forms black Ag 2 S (silver sulphide) and copper form greenish layer of basic copper carbonate CuCO 3.Cu(OH) 2. For example Magnesium Question 5. MCQ Questions for Class 10 Science with Answers was Prepared Based on Latest Exam Pattern. Answer: Copper lies below [H] in activity series of metals and cannot displace hydrogen from acid. Question 4. Answer: C : Iron. Answer: When a burning splinter is brought near the gas jar containing, pure H2 bums with pale blue flame quietly. (a) Colour and odour of hydrogen gas colourless. (a) Hydrogen gas in ‘highly inflamable’ i.e. Q.1. Copper doesn't displace hydrogen because copper has a higher standard electrode potential than hydrogen. (c) Chlorine acts as an oxidising/reducing agent. For example, Magnesium reacts with steam produce Magnesium oxide. It is also known as anhydrous copper(II) sulfate because it has no water in it. Answer: Question 3. Mg (s) + H2O (g) → MgO (s) + H2(g) Metals which react with steam form the solid metal oxide and hydrogen gas. (b) Hydrogen and oxygen mixture on burning produces a high temperature upto 2800°C which is used for welding and cutting of metals. Mg(s) + 2H 2 O(l) → Mg(OH) 2 (aq) + H 2 (g) Copper does not react even with steam. Starting from zinc how would you obtain hydrogen using, (a) Steam (b) A dilute acid (c) An alkali. Name three compounds containing hydrogen in the combined state. Zn lies above [H] in reactivity series of metals and being more reactive can displace hydrogen from dil. I don't think any will react with NaOH. The gain in mass of the whole apparatus is equal to the mass of the hydrogen in the water. Beryllium metal does not react with water or steam, even if the metal is heated to red heat. Q.5. (a) A neutral liquid (b) A basic gas (c) A metal by reduction of its heated oxide. (a) Why does calcium start floating when added to water? A known mass of heated copper(II) oxide is reduced in a stream of hydrogen gas and the water formed absorbed. (c) Write equation for the reaction of iron with steam. To increase the number of H+ ions distilled water is acidified and made good conductor of electricity. Metal are Cu, Hg, Ag, Pt and Au. Hope this answers all your question! It reacts with oxygen to form Slack coloured compound, CuO. 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. 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 has almost no reaction with cold water.It reacts slowly with hot water to give the slightly soluble magnesium hydroxide and hydrogen. (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. Hydrogen - Hydrogen - Production and applications of hydrogen: The most important industrial method for the production of hydrogen is the catalytic steam–hydrocarbon process, in which gaseous or vaporized hydrocarbons are treated with steam at high pressure over a nickel catalyst at 650°–950° C to produce carbon oxides and hydrogen: CnH2n+2 + nH2O → nCO + (2n + 1)H2; … Question 7. • 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. Answer verified by Toppr ‘Hydrogen is obtained by electrolysis of acidified water’. Answer: B : Sodium, Question 2. The released gas can be ignited if it is released into an oxygenated environment. (c) One vol. The reactivity series shows metals in order of reactivity. The reactivity series of metals is a chart listing metals in order of decreasing reactivity. Water gas to hydrogen – industrially. Electrode through which current enters the electrolyte is anode. 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. The reaction of chlorine with hydrogen sulphide is deemed a redox reaction. acids. (a) Chlorine is oxidised/redcued to HCl. 9. Reduction on the otherhand involves addition of hydrogen to a substance or removal of oxygen from a substance. HCl] is not Used in the laboratory preparation of hydrogen, using zinc and an acid. Answer: To obtain hydrogen using : (a) Steam : Metals above [H] in activity series of metals, i.e. The metal which reacts with steam liberating hydrogen & the reaction is reversible. Magnesium burns in steam to produce white magnesium oxide and hydrogen gas. In general, the more reactive the … With reference to oxidation & reduction reaction – complete the statement given by filling in the blanks with only the words (a) Addition (b) Removal. Question 2. Answer: CO2 is removed by dissolving the mixture obtained in water under pressure By passing the mixture through water or KOH [Caustic Potash Solution] 2KOH + CO2 → K2CO3 + H20 Residual gas left is HYDROGEN. Yes, zinc (zn) does react with hydrochloric acid (Hcl) to form the product zinc chloride and hydrogen gas which is given off. (c) An alkali : Zn, Pb react with concentrated alkali on boiling to give the corresponding metallic salt and liberate hydrogen. The water gas shift reaction was discovered by Italian physicist Felice Fontana in 1780. Odourless. Draw neat labelled diagrams for two different experiments to prove that – hydrogen is lighter than air. (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. How many grams of H2O . Question 4. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. H2 + Oxygen mixture bums with explosion. a, c, d would react with HCl and produce H2. From these results the % by mass composition of water can be worked out and itsformuladeduced. Mg + H2O (g) → MgO + H2. 2Cu + O 2 → 2CuO (Black) Question 9. Question 2. Magnesium reacts very quickly when added to hydrochloric acid. arpitachoudhary4426 arpitachoudhary4426 01.04.2020 Chemistry Secondary School What happens when copper oxide reacts with hydrogen gas? However, if steam … colour does not change. What is the rate law for this reaction? When copper is heated strongly in air, it combines with oxygen to form Copper (II) oxide, a black oxide. (c) Reduction of Fe2O3 (iron oxide) on heating to metal iron. Free PDF Download of CBSE Class 10 Science Chapter 3 Metals and Non-Metals Multiple Choice Questions with Answers. acids. With reference to the equation : Cl2 + H2S → 2HCl + S pertaining to a redox reaction – select the correct answer in each case –. The product formed on combustion of hydrogen in air is ___ [water gas, water, producer gas]. Answer: Question 8. It was not until much later that … [ Give balanced equations for each & name the product formed in each case other than hydrogen]. Answer: E : Magnesium oxide. Answer: A foul smelling gas formed when hydrogen reacts with a molten non-metal, is hydrogen sulphide [H2S].

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