SATHEE: Transition and InnerTransition Elements - Result Question 30

Transition and InnerTransition Elements - Result Question 30

####31. When $M n O_{2}$ is fused with $K O H$ , a coloured compound is formed, the product and its colour is

(a) $K_{2} M n O_{4}$ , purple green

(b) $K M n O_{4}$ , purple

(c) $M n_{2} O_{3}$ , brown

(d) $M n_{3} O_{4}$ , black

(2003, 1M)

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Solution:

$K_{2} M n O_{4}$ (purple green) is formed which is the first step of preparation of $K M n O_{4}$ .

$2 M n O_{2} + 4 K O H + O_{2} ⟶ \underset{Purple green}{K_{2} M n O_{4}} + 2 H_{2} O$

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