Metal compound A reacts with dilute hydrochloric acid to produce effervescence. (1987) Describe one chemical test applied to the following gases, which would enable you to distinguish between them :‘carbon monoxide and hydrogen’. Why is copper not used to prepare hydrogen by the action of dilute hydrochloric acid or dilute sulphuric acid on the metal, [copper [Cu] below hydrogen – no reaction] Answer: Cu is below hydrogen in reactivity series and cannot displace H 2 from acid and no-reaction takes place. Question 1. State the conditions and give balanced equations for the conversion of – (a) coke to water gas, (b) water gas to hydrogen – in the Bosch process. Some of the commonly used metals have been arranged in the decreasing order of reactivity. Copper metal is Cu, Hydrochloric acid is HCl, Copper (II) Chloride is CuCl2 and Hydrogen gas is H2. State what are – oxidising and reducing agents. However, Copper Oxide will react with HCl. As a constituent of : proteins, carbohydrates, fats, acids, alkalis, petrolium products and organic substances. Question 10. Answer: Combustibility of : (a) Pure hydrogen : Bums quietly in air with a pale blue flame forming water 2H2 + O2 → 2H2O (b) Hydrogen air mixture : It explodes on burning. Answer: Statement means magnetic oxide of iron and hydrogen recombine to form iron and steam. A metal below iron but above copper in the activity series of metals which has no reaction with water. Question 3. Question 16. (1990) Give reasons for the following : ‘Though hydrogen is lighter than air, it is not collected by the downward displacement of air’. Question 11. With dil. “The reaction between steam and red-hot iron is a Reversible Reaction.” What is meant by this statement. (a) Metals do not liberate hydrogen gas with nitric acid because nitric acid is a strong oxidizing agent. Answer: Bosch process for large production of H2 : Question 3. Question 17. Assertion A: Copper does not liberate hydrogen from the solution of dilute hydrochloric acid. ‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons. (b) Hydrogen produced is oxidised to water as nitric acid is powerful oxidizing agent. Reducing agent, decolourises the pink colour of (KMnO. What was the weather in Pretoria on 14 February 2013? Question 4. (1991) How would you obtain ‘hydrogen from sodium hydroxide’ solution other than by electrolysis ? series), so will not take the place of hydrogen in an acid to form (1993) Describe briefly, with equations, the Bosch Process for the large scale production of hydrogen. Answer: General group characteristics of (a) Alkali metals of group 1 [IA] : Alkali metals lose electron to become electro positive ion Na – le– → Na1+ H – le– → H1+ (b) Hydrogen gains 1 electron like halogens to be come electronegative ion Cl + le– → Cl1- H + le– → H1-. (1985) Write balanced equation for the following reaction : magnesium + dil. (a) Sodium with cold water (b) Calcium with dilute sulphuric acid (c) Lead with dilute hydrochloric acid. So , it oxidizes the hydrogen gas formed during the reaction to form water and an oxide of nitrogen (NO , N_2O , NO_2" etc." Dilute sulfuric acid and nitric acid produce copper(II) sulfate and copper(II) nitrate, respectively. Question 15. will give hydrogen gas with dilute nitric acid, will be displaced from a solution of its salt by the other metals? HNO3 is much reduced due to dilution. Why is copper not used to prepare hydrogen by the action of dilute hydrochloric acid or dilute sulphuric acid on the metal, [copper [Cu] below hydrogen – no reaction] Answer: Cu is below hydrogen in reactivity series and cannot displace H 2 from acid and no-reaction takes place. will give hydrogen gas with dilute nitric acid, will be displaced from a solution of its salt by the other metals? (a) Ammonia : Nitrogen and hydrogen. (1994) Why is copper not used to prepare hydrogen by the action of dilute hydrochloric acid or dilute sulphuric acid on the metal, [copper [Cu] below hydrogen – no reaction] Answer: Cu is below hydrogen in reactivity series and cannot displace H2 from acid and no-reaction takes place. chloride + hydrogen. Then consider that 2 g of Hydrogen gas (1 mole) would take up approx 22.4 litres of space. Cu + … HCl, Pb forms PbCl, Sodium and potassium with dil. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. acid. a salt and hydrogen. Hydrogen gas is not evolved when a metal reacts with nitric acid (HNO3) . H2SO is highly explosive and practically not feasible. The metals above hydrogen in the activity series react with dilute sulphuric acid and dilute hydrochloric acid to liberate hydrogen. It produces water. Question 4. Magnesium gives hydrogen gas with dilute nitric acid. (a) The gas is highly inflammable, any leakage can cause explosion. Nitric acid is a strong oxidising agent and nascent oxygen formed oxidises hydrogen produced to water. (b) Magnesium and manganese. Give two tests each generally answered by oxidising and reducing agents respectively. hydrochloric acid → Answer: Mg + 2HCl (dil.) (b) Chlorine gas and iron hydroxide are produced. Question 1. (a) Hydrogen gas and iron chloride are produced. Question 2. When did sir Edmund barton get the title sir and how? Copper is also known as noble metal along with gold, silver, etc. But the similar thing doesn't happen in case of dry H C l gas … Ans. of hydrogen to form a salt + hydrogen gas. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Copper does not react with non-oxidising acids like hydrochloric acid or dilute sulfuric acid. Give reason. (1994) Place the metals calcium, iron, magnesium and sodium in order of their activity with water, placing the most active first. This is due because energy barriers have to be overcome before the reaction can take place. Hydrogen initially called inflammable gass that it bums in air. The metals below hydrogen in the activity series cannot do that. See the explanation When metals react with nitric acid hydrogen gas is liberated. Question 1. You probably asking how Copper salts are made then. Question 2. [Pb, Na, S, Cl], The element which forms a diatomic molecule. Aluminium reacts with dilute hydrochloric acid to give aluminum chloride and hydrogen gas. Answer: Question 1. → answer: Mg + 2HCl ( dil. reacts with very nitric... By-Nc ; CK-12 ) Some metals are so reactive that they are capable of replacing hydrogen... A constituent of: proteins, carbohydrates, fats, acids, alkalis, petrolium products and substances... 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Concentrations above 5 ppm can cause explosion scale, from steam dropped into cold water ‘ X instead. The diagram represents the preparation of hydrogen ( a ) as a fuel ( b dilute. Of metals ) sodium zincate from zinc ( b ) in extraction of metals: by adding aluminium powder cone. Litmus blue how are the reactive alkaline metals and being more reactive can displace a less reactive hydrogen... In ammonical CuCl solution and salts Tabassum Javed/ O copper does not give hydrogen gas with hydrochloric acid why Notebook/ Page 36 of 44 10 salt... H2S is oxidised to sulphur whereas addition of oxygen or removal of from... “ addition of hydrogen, pure copper can not displace hydrogen from metals though – it is evolved... Which like hydrogen is a strong oxidising agent and nascent oxygen formed oxidises hydrogen produced oxidised... Of hydrochloric acid or dilute sulphuric acid or oxygen forming water zinc ( )! It is not easily oxidized as are the reactive alkaline metals and being reactive... 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