An acid with molecular formula $C_{7} H_{6} O_{3}$ forms three types sodium salts, i.e., $C_{7} H_{5} O_{3} N a, C_{7} H_{4} O_{3} {N a}_{2}$ 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 B Three
$C_{7} H_{6} O_{3}$ has three hydrogen atoms attached to oxygen which are replacable by $N a$ . So it is tribasic acid.

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