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Chemistry · PYQ NEET UG 2016(1)

हिन्दी

Which one of the following statements is CORRECT when \( SO_2 \) is passed through acidified \( K_2Cr_2O_7 \) solution?

  1. Green \( Cr_2(SO_4)_3 \) is formed.
  2. \( SO_2 \) is reduced.
  3. The solution turns blue.
  4. The solution is decolourized.

Correct answer · Option 1

Green \( Cr_2(SO_4)_3 \) is formed.

Explanation

\( SO_2 \) reduces dichromate ions to green \( Cr^{3+} \) ions (forming \( Cr_2(SO_4)_3 \)), while \( SO_2 \) itself gets oxidized to sulfate.
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