Qualitative Analysis - Result Question 14
14. $[X]+H _2 SO _4 \rightarrow[Y]$ a colourless gas with irritating smell
$[Y]+K _2 Cr _2 O _7+H _2 SO _4 \longrightarrow$ green solution
$[X]$ and $[Y]$ are
(2003,1 M)
(a) $SO _3^{2-}, SO _2$
(b) $Cl^{-}, HCl$
(c) $S^{2-}, H _2 S$
(d) $CO _3^{2-}, CO _2$
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Answer:
Correct Answer: 14. (a)
Solution:
$\underset{X}{SO _3^{2-}}+H _2 SO _4 \longrightarrow \underset{Y}{SO _2 \uparrow}+H _2 O+SO _4^{2-}$
$SO _2$ is a colourless gas with irritating odour.
$\underset{Y}{3 SO _2}+{K _2 Cr _2 O _7}+H _2 SO _4 \longrightarrow \underset{2}{K _2 SO _4}+\underset{\text {Green solution }}{Cr _2\left(SO _4\right) _3}+H _2 O$
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