Q. What is the valency of Manganese in $K_{2} M n O_{4}$ ?

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A

2

8%

B

4

15%

C

6

56%

D

7

20%

Solution:

Let the valency of $M n$ be $x$ in $K_{2} M n O_{4}$
$\Rightarrow 2 \times (+ 1) + x + 4 \times (- 2) = 0 \Rightarrow x = + 6$