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AIIMS 201926 May
Exam
AIIMS
Year
2019
Date
26 May
Subject
Chemistry
Chapter
d and f Block Elements

AIIMS 2019 · 26 May · Chemistry · d and f Block Elements

Which of the following can react with K_2 Cr_2 O_7 ?

Which of the following can react with K2Cr2O7\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 ?

Options

  1. ASO32−\mathrm{SO}_3^{2-}
  2. BCO32−\mathrm{CO}_3^{2-}
  3. CSO42−\mathrm{SO}_4^{2-}
  4. DNO3−\mathrm{NO}_3^{-}

Correct answer

A. SO32−\mathrm{SO}_3^{2-}

Step-by-step solution

K2Cr2O7\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 oxidises sulphites to sulphates. Cr2O72−+8H++3SO32−→2Cr3++3SO42−+4H2O\begin{aligned} & \mathrm{Cr}_2 \mathrm{O}_7^{2-}+8 \mathrm{H}^{+}+3 \mathrm{SO}_3^{2-} \rightarrow 2 \mathrm{Cr}^{3+}+3 \mathrm{SO}_4^{2-} \\ &+4 \mathrm{H}_2 \mathrm{O}\end{aligned}
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