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Identify the salts P & Q from the observ...

Identify the salts P & Q from the observations given below: i] On performing the flame test salt P produces a lilac coloured flame & its solution gives a white precipitate with silver nitrate solution, which is soluble in ammonium hydroxide solution. ii] When dilute HCl is added to a salt Q, a brisk effervescence is produced and the gas turns lime water milky. When `NH_4 OH` solution is added to the above mixture [after adding dilute HCI], it produces a white precipitate which is soluble in excess `NH_4OH` solution.

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