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(i) Write the balanced equations for the...

(i) Write the balanced equations for the reactions when ammonium sulphate is heated with a mixture of nitric oxide and nitrogen dioxide.
(ii) Aqueous ammonia is added dropwise to a solution of copper sulphate till is in excess.

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(i) `(NH_4)_2 SO_4 + NO + NO_2 overset (Delta) rarr 2 N_2 + 3 H_2 O + H_2 SO_4`
(ii) Ammonia gives deep-blue colour with copper sulphate due to formation of a complex.
`CuSO_4 + 2 NH_2 OH rarr Cu(OH)_2 + (NH_4)_2 SO_4`
`Cu(OH)_2 + 2 NH_4 OH + (NH_4)_2 SO_4 rarr [Cu(NH_3)_4] SO_4 + 4 H_2 O`.
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