JIPMER2004Chemistryd and f Block Elements

Which of the following turns potassium dichromate paper green?

Options

ANO ₂
BHCl
CNH ₃
DSO ₂

Correct answer

D. SO ₂

Step-by-step solution

SO ₂ gas is a reducing agent, hence turns dichromate paper green due to formation of chromium sulphate. Sulphite radical ( SO ₃²⁻ ) is identified by this: K ₂ Cr ₂ O ₇+3 SO ₂+ H ₂ SO ₄ green Cr ₂ ( SO ₄ )₂ + K ₂ SO ₄+ H ₂ O

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