First slide

Potassium dichromate

Question

Which one of the following statements is correct when ${SO}_{2}$ is passed through acidified $K_{2} {Cr}_{2} O_{7}$ solution?

Moderate

A

${SO}_{2} is reduced .$
B

$Green {Cr}_{2} {({SO}_{4})}_{3} is formed.$
C

$The solution turns blue.$
D

$The solution is decolourised .$

Solution

$K_{2} {Cr}_{2} O_{7} + H_{2} {SO}_{4} + 3 {SO}_{2}$ $\to K_{2} {SO}_{4} + {Cr}_{2} {({SO}_{4})}_{3} + H_{2} O$
$aq . {Cr}_{2} {({SO}_{4})}_{3} is green coloured solution .$

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