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(A) $1$. $SO_3$ reacts with concentrated $H_2SO_4$ to form oleum $(H_2S_2O_7)$ and does not release oxygen gas.$2$. $PbO_2$ reacts with concentrated $

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$SO_3$

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(A) $1$. $SO_3$ reacts with concentrated $H_2SO_4$ to form oleum $(H_2S_2O_7)$ and does not release oxygen gas.$2$. $PbO_2$ reacts with concentrated $H_2SO_4$ to release oxygen: $2PbO_2 + 2H_2SO_4 \rightarrow 2PbSO_4 + 2H_2O + O_2 \uparrow$.$3$. $MnO_2$ reacts with concentrated $H_2SO_4$ to release oxygen: $2MnO_2 + 2H_2SO_4 \rightarrow 2MnSO_4 + 2H_2O + O_2 \uparrow$.$4$. $CrO_5$ (chromium peroxide) is unstable and decomposes in the presence of acid to release oxygen: $4CrO_5 + 6H_2SO_4 \rightarrow 2Cr_2(SO_4)_3 + 6H_2O + 7O_2 \uparrow$.

Which of the following compounds does not liberate oxygen gas on warming with concentrated $H_2SO_4$?

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