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KVPY2018Chemistryp Block Elements (Group 15, 16, 17 & 18)

A filter paper soaked in salt X turns brown when exposed to HNO 3 vapor. The salt X is

Options

  1. AKCl
  2. BKBr
  3. CKI
  4. DK 2 SO 4

Correct answer

C. KI

Step-by-step solution

As, a filter paper soaked in salt X turns brown when exposed to H N O 3 vapour, then salt X must be a strong reducing agent which will reduce H N O 3 to N O 2 (brown gas). Among the given salt, K I is the strongest reducing agent. Thus, salt X is K I . undefined + 2 H 2 O

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