Question: 7 - 7 2 On adding HCl to all the following salts it form a gas and a precipitate except a . N a 2

7-72 On adding HCl to all the following salts it form a gas and a precipitate except a.Na2S2O3 b)HgNO2 c.Pb(HCO3)2 d.Na2CO3
7 - 7 2 On adding HCl to all the following salts

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