(C) The reaction with dilute $H_2SO_4$ releases a colorless gas. $SO_3^{2-} + 2H^+ \rightarrow H_2O + SO_2 \uparrow$. $SO_2$ gas turns baryta water $[

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(C) The reaction with dilute $H_2SO_4$ releases a colorless gas. $SO_3^{2-} + 2H^+ \rightarrow H_2O + SO_2 \uparrow$. $SO_2$ gas turns baryta water $[Ba(OH)_2]$ turbid due to the formation of $BaSO_3$: $Ba(OH)_2 + SO_2 \rightarrow BaSO_3 \downarrow + H_2O$. $SO_2$ is a reducing agent and reduces acidic dichromate solution (orange) to $Cr^{3+}$ (green),effectively decolorizing the orange color: $Cr_2O_7^{2-} + 3SO_2 + 2H^+ \rightarrow 2Cr^{3+} + 3SO_4^{2-} + H_2O$.

Class 12 Chemistry Principles Related to Practical Chemistry Wet Test for Acid Radical

Medium

$A$ substance reacts with dilute $H_2SO_4$ to release a colorless gas,which turns baryta water $[Ba(OH)_2]$ turbid and decolorizes an acidic solution of dichromate. The presence of which of the following is indicated by this reaction?

A
$CO_3^{2-}$
B
$S^{2-}$
C
$SO_3^{2-}$
D
$NO_2^-$

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Wet Test for Acid Radical

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White heavy precipitates are formed when $BaCl_2$ is added to a clear solution of compound $A$. Precipitates are insoluble in dilute $HCl$. Then,the compound $A$ is

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Assign $A, B, C, D$ from the given type of reaction.
$BaSO_4 \downarrow + dil. HCl$ $(Excess)$ $\longrightarrow$ No reaction

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$A$ substance reacts with dilute $H_2SO_4$ to release a colorless gas,which turns baryta water $[Ba(OH)_2]$ turbid and decolorizes an acidic solution of dichromate. The presence of which of the following is indicated by this reaction?

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$P_{(Coloured \ Solution)} + BaCl_2 \to Q \downarrow_{(White)} + R_{(Coloured \ Solution)}$
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