1.

State one appropriate observation for each of the following: 1. Concentrated sulphuric acid is added drop wise to a crystal of hydrated capper sulphate. 2. Copper sulphide is treated with dilute hydrochloric acid. 3. Excess of chlorine gas is reacted with ammonia gas. 4. A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution. 5. Electricity is passed through molten lead bromide.

Answer»

1. The blue colour of the solution changes to white.

2. A gas evolved which has the smell of rotten eggs.

3. A yellow coloured explosive is formed.

4. Curdy white ppt. observed which is soluble in NH4OH.

5. Reddish brown vapours of bromine are evolved.



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