Correct order of resonance stabilization in $H_{2} C O_{3}$ and $C O_{3}^{2 -}$ is:

C O_{3}^{2 -} > H_{2} C O_{3}

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C O_{3}^{2 -} < H_{2} C O_{3}

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C O_{3}^{2 -} = H_{2} C O_{3}

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None of these

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Solution

The correct option is A $C O_{3}^{2 -} > H_{2} C O_{3}$
Carbonate ion $(C O_{3}^{- 2})$ has greater resonance stabilization than carbonic acid.

Carbonate ion resonance structures:

Carbonic acid does not have resonance structures.

So, the correct option is A.

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