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AIIMS2019Chemistryd and f Block Elements

Which of the following can react with K ₂ Cr ₂ O ₇ ?

Options

  1. ASO ₃²⁻
  2. BCO ₃²⁻
  3. CSO ₄²⁻
  4. DNO ₃⁻

Correct answer

A. SO ₃²⁻

Step-by-step solution

K ₂ Cr ₂ O ₇ oxidises sulphites to sulphates. aligned & Cr ₂ O ₇²⁻+8 H ⁺+3 SO ₃²⁻ 2 Cr ³⁺+3 SO ₄²⁻ &+4 H ₂ O aligned

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