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Dissolved O(2) in water is determined by...

Dissolved `O_(2)` in water is determined by using a redox reaction
`2Mn^(2+)(aq)+40overset(ɵ)(H)(aq)+O_(2)(g)to2MnO_(2)(s)+2H_(2)O(l)`
How many equivalents of `O_(2)` will be required to react with 1 " mol of "`Mn^(2+)`?

A

1

B

2

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
`Mn^(2+)toMnO_(2)+2e^(-)`
`4e^(-)+O_(2)to2H_(2)O`
`1 " Eq of "Mn^(2+)=1 " Eq of "O_(2)`
`(1)/(2)mol=1Eq`
`2 mol Mn^(2+)=4 " Eq of "O_(2)`
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