1.

State one observation for each of the following: 1. Excess ammonium hydroxide solution is added to lead nitrate solution. 2. Bromine vapours are passed into a solution of ethyne in carbon tetrachloride. 3. A zinc granule is added to copper sulphate solution. 4. Zinc nitrate crystals are strongly heated. 5. Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.

Answer»

1. Insoluble chalky white ppt of lead hydroxide is obtained. 

2. Reddish brown colour of bromine water disappears.

3. The blue colour of copper sulphate solution disappears. 

4. Reddish brown fumes of nitrogen dioxide a colourless gas that rekindles a glowing splint are released. In the test tube, a ppt is left which is yellow when hot and white when cold. 

5. Insoluble reddish brown ppt obtained



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