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From the list of the following salts — 

AgCl, MgCl2 , NaHSO4 , PbCO3 , ZnCO3 , KNO3 , Ca(NO3 )2 State the salt which on heating, evolves a brown coloured gas.

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On heating this salt, a brown-coloured gas is evolved is Ca(NO3 )2

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