1.

Forthe reaction M^X+MnO_(4) ^(- )to MO_3^(-) +Mn^(2+)+1//@O_2ifonemoleof MnO_(4)^(-)oxidises1.67molesof M^+ to MO_3^(-)thenthe valueof xin thereactionis

Answer»

5
3
2
1

Solution :`overset(+7 )(MnO_(4)^(-)+5E^(-) toMn^(2+)`
since1 moleof `MnO_4^(-)`accepts5 MOLESOF electronstherefore, 5 moles of electrons are lostby 1.67molesof`M^(X+)`
` therefore ` 1 moleof`M^(x+)`will loseelectrons
`= 5 //1.67= 3 ` moles( approx )
since ` M^(x+)` changesto `MO_(3)^(-)`
( whereO.N of`M= +5 )`byaccepting 3electrons
` thereforex= +5 -3 =+2`


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