An acid with molecular formula $C_{7} H_{6} O_{3}$ forms three types of sodium salts.
i.e., $C_{7} H_{5} O_{3} N a, C_{7} H_{4} O_{3} N a$ and $C_{7} H_{3} O_{3} N a_{3}$ . The basicity of the acid is:

one

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two

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three

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four

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Solution

The correct option is C three
Basicity of an acid is the number of replaceable hydrogen atoms present in the molecule of an acid.
$C_{7} H_{6} O_{3} ⟶$ Acid.
$C_{7} H_{3} O_{3} N a_{3} ⟶$ Three replaceable hydrogens.
$⟹$ Basicity $= 3$

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