Question

H3PO2 can give only 2 hydrogen ions
when dissociated

why please answer with explanation

Answer 1

H3PO2 has one free OH bond the basicity is known to be 1. It is not 3 as we normally know that number of hydogens is the basicity in a given chemical formula actually that is always true with few exception such as H3PO2 and H3PO3 have respectively 1 and 2 as their basicity.we all know that for an acid the basicity is defined as the number of OH bonds

Answer 2

You question is wrong.

On dissociation ,it can only give one hydrogen which is attached with oxygen.

by seeing the structure,you can easily think it by your own.

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