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Q.

In the laboratory ${MnO}_{4}^{-}$ It is prepared by oxidation of Mn⁺² salt by peroxodisulphate ion. During this reaction, the element whose oxidation state does not change is

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a

Oxygen

b

Sulphur

c

Manganese

d

Both 1 and 2

answer is B.

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Detailed Solution

$2 {Mn}^{+ 2} + 5 S_{2} O_{8}^{- 2} + 8 H_{2} O \to 2 {MnO}_{4}^{-} + 10 {SO}_{4}^{- 2} + 16 H^{+}$

Element	Change in oxidation state
Mn	+2 to +7
O	-1 to -2
S	No change
H	No change

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