Dear student, the formula of hypophosphorous acid is ..
H3PO2..
Hypophosphorous acid (HPA), or phosphinic acid, is a phosphorus oxyacid and a powerful reducing agent with molecular formula H3PO2. It is a colorless.

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Hello Aspirant,

Chemical formula for Hypophosphorous acid is ‎H3PO2. It is also known by the name of phosphinic acid, it is a phosphorus oxyacid and a powerful reducing agent.

It is mainly used in industries for electroless nickel plating(NI-P).

I hope this information helps you.

Good Luck!!