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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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