NEET · Chemistry · STD 12 - 4. d and f- block elements
Which one of the following statements is correct when \(SO_2\) is passed through acidified \(K_2Cr_2O_7\) solution?
- A \(SO_2\) is reduced.
- B Green \(Cr_2(SO_4)_3\) is formed.
- C The solution turns blue.
- D The solution is decolourised.
Answer & Solution
Correct Answer
(B) Green \(Cr_2(SO_4)_3\) is formed.
Step-by-step Solution
Detailed explanation
\(\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4}+3 \mathrm{SO}_{2} \longrightarrow \mathrm{K}_{2} \mathrm{SO}_{4}+\mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}+\mathrm{H}_{2} \mathrm{O}\) The appearance of green colour is due to the reduction of chromium metal.
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