KVPY SA Exam 2018 Question Paper

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Question : 44 of 80

Marks: +1, -0

A filter paper soaked in salt X turns brown when exposed to HNO

_3

vapor. The salt X is –

KCl
KBr
KI
$K_2SO_4$

Solution:

2 KI + 4 HNO_3 \ {–––––▸} I_2 + 2 NO_2

+ 2 KNO_3 + 2 H_2O

Iodide ion is a strong reducing agent and reduces HNO

_3

vapours to NO

_2

(Brown gas)

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