How many of the following does not react...

How many of the following does not react with dil HCl, Cu, Ag, `Na_(2)CO_(3), NaHCO_(3),Na_(2)HPO_(4), Na_(3)PO_(4), Mg, K, KHO, KH_(2) PO_(3), NH_(3), KCl`

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The correct Answer is:

3

dil. HCl doesnot react with Cu & Ag & KCl

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