1. Write a balanced the chemical equation for the following and identify the substance which is a) reduced b) oxidized c) oxidising agent d)reducing agent.
hydrogen sulphide reacts with Sulphur dioxide getting Sulphur and water.
2. Give reasons for the following
A) When copper turnings are added to Silver Nitrate solution the solution becomes blue in colour after some time.
B) silver chloride should be stored in coloured bottles.
C) Red litmus paper turns blue you when touched with aqueous solution of magnesium oxide.
Answers
Answer:
When the gases sulphur dioxide and hydrogen sulphide mix in the presence of water, the reaction is as shown. Here, hydrogen sulphide is acting as: SO2+2H2S→2H2O+3S
Copper on being dipped in Silver Nitrate solution forms Copper Nitrate (it displaces Silver due to their position in the reactivity series). The Copper Nitrate formed is blue in colour in water(thus the solution turns blue from colourless).
Silver chloride is a light-sensitive chemical compound andit easily undergoes photolytic decomposition reaction. Silver chloride decomposes into silver and chlorine gas when exposed to sunlight. Hence Silver chloride is stored in dark-colored bottles.
(a) On exposure to air, aluminium forms a hard protective layer of aluminium oxide (Al2O3) which prevent further oxidation. (b) Magnesium oxide is an oxide of a metal, so, it is basic in nature. Due to its basic character it turns red litmus blue when touched with its aqueous solution.
Explanation: