Question 16. That will tell you why copper reacted with the acid. x Do all metals react with acid to produce hydrogen gas? Question 1. Answer: OXIDATION : “Addition of oxygen or removal of hydrogen is called oxidation. So, as soon as hydrogen gas is formed in the reaction between a metal and dilute nitric acid, the nitric acid oxidisesthis hydrogen to water. 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: Copper does not displace hydrogen from the acid. Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid. By comparison, copper cannot displace hydrogen from HCl because it's less reactive than hydrogen. Answer: Question 1. Then consider that 2 g of Hydrogen gas (1 mole) would take up approx 22.4 litres of space.
Reason (R): Hydrogen is below copper in the electrochemical series. (c) Otherwise gas produced will escape through thistle funnel. Reduction : Addition of hydrogen or removal of oxygen is called reduction. (c) The lower end of the thistle funnel should dip below the level of the acid in the flask. Iron forms a pale green compound. Copper is also known as noble metal along with gold, silver, etc. (b) Hydrogen chloride : Hydrogen and chlorine. Copper is not easily oxidized as are the reactive alkaline metals and alkaline earth metals you are referring to. Hydrogen chloride is available commercially as an anhydrous gas or as aqueous solutions (hydrochloric acid). Answer: Manufacture of H2 from steam : From natural gas : Natural gas is obtained from petroleum wells and consists mainly CH4 (methane). Copper does not reacts with dilute sulphuric acid, liberating hydrogen b ecause copper is lower in the electromotive series than hydrogen, or more fundamentally, because the magnitude of the change in Gibbs free energy when a single atom of elemental hydrogen ionizes is greater than the magnitude of the change in Gibbs free energy when a single atom of elemental copper ionizes. The same can be understood by looking at the activity series of metals. This is due because energy barriers have to be overcome before the reaction can take place. Answer: When powdered zinc reacts with sodium hydroxide it produces hydrogen. Hydrogen gas and iron chloride are produced. Hydrogen is collected by the downward displacement of water and not air even though – it is lighter than air. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. (a) Sodium zincate from zinc (b) Sodium plumbite from lead (c) Sodium aluminate from aluminium. ! Question 3. Answer: Question 2. Give balanced equations for the following conversions. Hydrogen can be placed in group 1[1A] as it forms a positive ion as in HC1 like alkali metals H, Question 2. (a) Metals do not liberate hydrogen gas with nitric acid because nitric acid is a strong oxidizing agent. As its electrode (reduction) potential is higher than that of hydrogen, pure copper cannot displace hydrogen from such acids. Question 2. (1988) Explain briefly how hydrogen is manufactured on a large scale, from steam. Copper does not react with hydrochloric acid. 1].e Give a reason why hydrogen can be placed in group 1 [1A] and group 17 [VIIA] of the periodic table. Answer: Preparation of H2 from potassium hydroxide. No. Question 1. (b) Zinc granules give hydrogen gas; along with zinc chloride; when they react with hydrochloric acid. Write the equation for each of the above metals which react with Water. Copper lies below [H] in activity series of metals and cannot displace hydrogen from acid. (a) Sodium with cold water (b) Calcium with dilute sulphuric acid (c) Lead with dilute hydrochloric acid. Question 4. This is the cause that copper does not react with dilute hydrochloric acid and consequently does not liberate hydrogen gas while zinc does. This similarity in electron structure makes them similar in many characteristics. Copper(I) oxide dissolves in concentrated ammonia solution to form the colourless complex [Cu(NH 3) 2] +, which is easily oxidized in air to the blue [Cu(NH 3) 4 (H 2 O) 2] 2+. Thus hydrogen gas is left over. As a constituent of : proteins, carbohydrates, fats, acids, alkalis, petrolium products and organic substances. The balanced equation is = 2Al(s) + 6HCl(aq) -----> 2AlCl3(aq) + 3H2(g). Give examples of oxidising and reducing agents in the gaseous, liquid and solid form. Zinc reacts with hydrochloric acid to produce hydrogen gas because it's more reactive than hydrogen, and thus displaces the latter from an acid. When did sir Edmund barton get the title sir and how? A metal below iron but above copper in the activity series of metals which has no reaction with water. Magnesium gives hydrogen gas with dilute nitric acid. “The reaction between steam and red-hot iron is a Reversible Reaction.” What is meant by this statement. Answer: Element reacts with water violently at room temperature is potassium. Why copper does not react with dilute HCl acid like dilute HNO 3 acid? A gaseous reducing agent which is basic in nature. (c) With lead dil. Answer: See Q. Q3. of hydrogen to form a salt + hydrogen gas. Copper doesn't displace hydrogen because copper has a higher standard electrode potential than hydrogen. It dissolves in hydrochloric acid to give solutions of CuCl − 2. Copper fall below hydrogen … Ans. Thus, when hydrochloric acid is used in place of sulphuric acid, zinc chloride is formed instead of zinc sulphate; along with hydrogen gas and the reaction takes place at the same rate. Give reasons for the following : (a) The complete apparatus is air-tight. (1984) How can you obtain hydrogen from sodium hydroxide [not by electrolysis]. State the reactant added to hydrogen to obtain the respective product in each case. CuCl + CO + 2H2O → CuCl. Question 1. Compare the combustibility of –. Copyright © 2021 Multiply Media, LLC. (a) As sodium is very reactive and reacts with water violently, darts on the surface of water and collection of hydrogen becomes difficult. (It's your homework I'm not going to give you that.) CO is removed by dissolving mixture in ammonical CuCl solution. Question 74. Select from A to G the reactant added, to give the products 1 to 5, in the preparation of hydrogen gas. Hope it helps!! This is due because energy barriers have to be overcome before the reaction can take place. Zinc granules are preferred rather than pure zinc as impurity copper present in it has a catalysing effect and speeds up the rate of the reaction. Question 2. 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. (a) Boiling water using a divalent metal (b) Steam using a trivalent metal (c) Steam using a metal – and the reaction is reversible. 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. (1993) Account for the following facts : Question 1. Applied to hydrogen and chlorine can be separated by passage through a porous pot earth metals you are to... ( c ) in hydrogenation of oil & coal: ( c ) Otherwise gas will. Use of hydrogen, pure copper can not displace hydrogen from sodium hydroxide [ not by electrolysis generally by! Naoh + ____ answer: Use of hydrogen air forms an explosive mixture with.. 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