Which of the following salts cannot exist?

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Question

(A) The formula for hypophosphorous acid $(H_3PO_2)$ is $H(H_2PO_2)$. It is a monobasic acid because it contains only one $P-OH$ bond. Therefore,it ca

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Sodium hydrogen hypophosphite

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(A) The formula for hypophosphorous acid $(H_3PO_2)$ is $H(H_2PO_2)$. It is a monobasic acid because it contains only one $P-OH$ bond. Therefore,it can only form one type of salt,which is $NaH_2PO_2$ (sodium hypophosphite). It cannot form a 'sodium hydrogen hypophosphite' salt because there are no replaceable hydrogen atoms left after the formation of the primary salt. Thus,option $A$ is not possible.

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