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:

  1. $\underset{X}{SO _3^{2-}}+H _2 SO _4 \longrightarrow \underset{Y}{SO _2 \uparrow}+H _2 O+SO _4^{2-}$

$SO _2$ is a colourless gas with irritating odour.

$\underset{Y}{3 SO _2}+\underset{\text { Green }}{K _2 Cr _2 O _7}+H _2 SO _4 \longrightarrow \underset{2}{K _2 SO _4}+\underset{\text { Cr }}{Cr _2\left(SO _4\right) _3}+H _2 O$



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