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JIPMER 2014

Exam: JIPMER
Year: 2014
Subject: Chemistry
Chapter: Coordination Compounds

JIPMER 2014 · Chemistry · Coordination Compounds

Acidified K_2 Cr_2 O_7 solution turns green when Na_2 SO_3 is added...

Acidified

\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7

solution turns green when

\mathrm{Na}_2 \mathrm{SO}_3

is added to it. This is due to the formation of

Options

A $\mathrm{CrO}_4^{2-}$
B $\mathrm{Cr}_2\left(\mathrm{SO}_3\right)_3$
C $\mathrm{CrSO}_4$
D $\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3$

Correct answer

D. $\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3$

Step-by-step solution

\begin{aligned} & \mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7+3 \mathrm{Na}_2 \mathrm{SO}_3+4 \mathrm{H}_2 \mathrm{SO}_4 \longrightarrow \\ & 3 \mathrm{Na}_2 \mathrm{SO}_4+\mathrm{K}_2 \mathrm{SO}_4+\mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3+4 \mathrm{H}_2 \mathrm{O}\end{aligned}

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