1.

State one observation for each of the following : (i) Excess ammonium hydroxide solution is added to lead nitrate solution. (ii) Bromine vapours are passed into a solution of ethyne in carbon tetrachloride. (iii) A zinc granule is added to copper sulphate solution. (iv) Zinc nitrate crystals are strongly heated. (v) Sodium hydroxide solution is added to ferric chloride solution at first a little and then in excess.

Answer»

(i) A white ppt of lead hydroxide. 

(ii) A colourless solution is obtained and brown colour of bromine vapours disappears.

(iii) A red metal starts precipitating and the blue colour of the copper sulphate solution fades due to the formation of colourless zinc sulphate. 

(iv) A reddish brown gas is liberated. 

(v) A reddish brown ppt. of ferric hydroxide is formed which remains insoluble in excess of sodium hydroxide.



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