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KCET2010Chemistryd and f Block Elements

A white crystalline salt A reacts with dilute HCl to liberate a suffocating gas B and also forms a yellow precipitate. The gas B turns potassium dichromate acidified with dilute H ₂ SO ₄ to a green coloured solution C. A, B and C are respectively

Options

  1. ANa ₂ SO ₃, SO ₂, Cr ₂ ( SO ₄ )₃
  2. BNa ₂ ~S ₂ O ₃, SO ₂, Cr ₂ ( SO ₄ )₃
  3. CNa ₂ ~S ₂ SO ₂, Cr ₂ ( SO ₄ )₃
  4. DNa ₂ SO ₄, SO ₂, Cr ₂ ( SO ₄ )₃

Correct answer

B. Na ₂ ~S ₂ O ₃, SO ₂, Cr ₂ ( SO ₄ )₃

Step-by-step solution

Gas B turns the colour of acidified K ₂ Cr ₂ O ₇ green thus it is SO ₂ and SO ₂ is obtained along with yellow precipitate when thio sulphate is treated with dilute acids. Thus, A is Na ₂ ~S ₂ O ₃ , B is SO ₂ and C is Cr ₂ ( SO ₄ )₃ . The reactions are as follows

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