Question

ii) State your observation in the following cases: [3]

a) When Zinc sulphide is treated with dil. HCl.

b) When Copper metal is added to Silver Nitrate solution.

c) A rod dipped in Conc. HCl is brought near the mouth of a jar filled with Ammonia

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Answer 1

Explanation:

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a)Zinc reacts with dilute HCl to give a metallic zinc chloride with the evolution of hydrogen.

b)When copper reacts with AgNO3, Cu displaces Ag from AgNO3, forming Cu(NO3)2. It's a displacement reaction as well as redox reaction. Oxidation number of Cu changes from 0 to 2 so it's oxidized.

c)When a rod dipped in Hydrochloric Acid (HCl) is brought to the mouth of a bottle containing liquid Ammonia (NH3), dense white fumes are observed. Over time, the white fumes condense to form a solid white mass. This mass is ammonium chloride (NH4Cl). It is formed due to the reaction between HCl and NH3.