Anion which is protonated by dil. $H_{2} {SO}_{4}$ but produce volatile product only with cone. $H_{2} {SO}_{4}$ (not with dil. $H_{2} {SO}_{4}$ )

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$C_{2} O_{4}^{2 -}$

${PO}_{4}^{3 -}$

${SO}_{4}^{2 -}$

${CO}_{3}^{2 -}$

answer is A.

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Detailed Solution

$C_{2} O_{4}^{2 -}$ anion is protonated dilute sulphuric acid but it produces volatile product only with the concentrated sulphuric acid. Because dilution decreases the chances of volatility.

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