Q6 of 37 Page 23

Following reaction is used for the preparation of oxygen gas in the laboratory. Heat

2KClO3(s) 2KCl(s) + 3O2(g)


Which of the following statement(s) is (are) correct about the reaction?

Since the reaction involves the breaking down of a single reactant molecule into multiple products, it is a decomposition reaction. Moreover it involves the absorption of heat, so it is also an endothermic reaction.

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4

A reddish brown coloured metal used in electric wires, when powdered and heated strongly in an open China dish, its colour rums black. When hydrogen gas is passed over this black substance, it regains its original colour. Based on this information, the metal and black coloured substances are

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When dilute sulphuric acid is added to pieces of iron sulphide, hydrogen sulphide gas is produced and soluble ferrous sulphate is formed. The type of chemical reaction involved is

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A metal 'M' reacts with an acid according to the equation.

M + H+→ M3+ + H2.


Which of the following is correct for metal M?

 8

Which among the following statement (s) is/are true? Exposure of silver chloride to sunlight for a long duration turns grey due to

(i) the formation of silver by decomposition of silver chloride.


(ii) sublimation of silver chloride.


(iii) evolution of chlorine gas from silver chloride. (iv) oxidation of silver chloride.