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Q)

To a solution of a salt, $MgSO_4$ solution is added and white ppt. appears only on heating. The acid radical in the salt is

(a) $CO_3^{2-}$
(b) $HCO_3^-$
(c) $SO_3^{2-}$
(d) $C_2O_4^{2-}$

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