Plz answer me the questions...

Dear student,

2.When concentrated Nitric acid is added to Copper to give a green solution Cu(NO3)and a brownish gas NO2.

Cu + 4HNO3 ----> Cu(NO3)2 + 2NO2 + 2H2O.

3.When hydrogen sulphide gas is passed through lead acetate solution,then lead sulphide will be formed.lead sulphide is a black coloured product.

Pb(CH3COOH)2 + H2S ----> PbS + 2CH3COOH

4.when dilute hydrochloric acid is added to lead nitrate solution,a white precipitate of lead chloride is formed.

Pb(NO3)2 + 2HCl ----> PbCl2 + 2HNO3

Regards,

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