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X + d i l . H 2 S O 4 → Y colourless suffocating gas, Y + K 2 C r 2 O 7 + H 2 S O 4 → green colouration of solution. Then, X and Y are

Options

  1. AS O 3 2 - , S O 2
  2. BC l - , H C l
  3. CS 2 - , H 2 S
  4. DC O 3 2 - , C O 2

Correct answer

A. S O 3 2 - , S O 2

Step-by-step solution

S O 3 2 - X + d i l . H 2 S O 4 → S O 2 Y + H 2 O + S O 4 2 - Green colouration on reaction with K 2 C r 2 O 7 and H 2 S O 4 shows that Y is S O 2 . K 2 C r 2 O 7 + H 2 S O 4 + 3 S O 2 Y → C r 2 ( S O 4 ) 3 G r e e n colour + K 2 S O 4 + H 2 O

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