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Test for Ammonia

On adding dil...

Question

On adding dilute Hcl acid to compound A, a gas B, with burning sulphur smell is produced which turns lime water milky.when NaOH solution was added to solution of compound A, a light blue precipitate was formed which was insoluble in excess sodium hydroxide solution.identify the cation in compound A

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Solution

The solution is as follows:

1. The compound A is CuSO₄.

2. The reactions are as follows:

CuSO₄(aq) + 2 HCl (aq) $\to$ CuCl₂(aq) + SO₃ (g) + H₂O(l)
SO₃(g) + Ca(OH)₂(aq) $\to$ CaSO₄(s) + H₂O(l)

Also,

CuSO₄(aq) + 2 NaOH (aq) $\to$ Cu(OH)₂ (s) + Na₂SO₄(aq)

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