Which of the following statement(s) is (are) | vedclass

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(A, B, D) When $NaCl$ and $K_{2}Cr_{2}O_{7}$ are warmed with conc. $H_{2}SO_{4}$,they produce deep red vapours of chromyl chloride $(CrO_{2}Cl_{2})$.

Vedclass · Accepted Answer

Chromyl chloride is formed

Vedclass · Answer

(A, B, D) When $NaCl$ and $K_{2}Cr_{2}O_{7}$ are warmed with conc. $H_{2}SO_{4}$,they produce deep red vapours of chromyl chloride $(CrO_{2}Cl_{2})$. Thus,statement $(A)$ and $(D)$ are correct.When these vapours are passed through $NaOH$ solution,they form sodium chromate $(Na_{2}CrO_{4})$,which is yellow in color. Thus,statement $(B)$ is correct.Chlorine gas is not evolved in this reaction. Thus,statement $(C)$ is incorrect.The reactions are as follows:$(I)$ $K_{2}Cr_{2}O_{7} + 6 H_{2}SO_{4} \longrightarrow 2 KHSO_{4} + 2 CrO_{3} + 3 H_{2}O$$(II)$ $NaCl + H_{2}SO_{4} \longrightarrow NaHSO_{4} + HCl$$(III)$ $CrO_{3} + 2 HCl \longrightarrow CrO_{2}Cl_{2} + H_{2}O$$(IV)$ $CrO_{2}Cl_{2} + 4 NaOH \longrightarrow Na_{2}CrO_{4} + 2 NaCl + 2 H_{2}O$

List-$I$ (Name of the test)	List-$II$ (Reaction sequence involved) [$M$ is metal]
$A$. Borax bead test	$I$. $MCO_3$ $\rightarrow MO$ $\xrightarrow[+\Delta]{Co(NO_3)_2} CoO \cdot MO$
$B$. Charcoal cavity test	$II$. $MCO_3$ $\rightarrow MCl_2$ $\rightarrow M^{2+}$
$C$. Cobalt nitrate test	$III$. $MSO_4$ $\xrightarrow[\Delta]{Na_2B_4O_7} M(BO_2)_2$ $\rightarrow MBO_2$ $\rightarrow M$
$D$. Flame test	$IV$. $MSO_4$ $\xrightarrow[\Delta]{Na_2CO_3} MCO_3$ $\rightarrow MO$ $\rightarrow M$

List-$I$ Solid salt treated with dil. $H_2SO_4$	List-$II$ Anion detected
$A.$ Effervescence of colourless gas	$I.$ $NO_2^-$
$B.$ Gas with smell of rotten egg	$II.$ $CO_3^{2-}$
$C.$ Yellowish green gas with pungent and suffocating smell	$III.$ $S^{2-}$
$D.$ Brown fumes	$IV.$ $Cl^{-}$

Which of the following statement$(s)$ is (are) correct when a mixture of $NaCl$ and $K_{2}Cr_{2}O_{7}$ is gently warmed with conc. $H_{2}SO_{4}?$

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