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3.92 g of ferrous ammonium sulphate crys...

`3.92` g of ferrous ammonium sulphate crystals are dissolved in `100` mL of water, `20` mL of this solution requires `18` mL of `KMnO_(4)` during titration for complete oxidation. The weight of `KMnO_(4)` present in one litre of the solution is

A

`3.476 g`

B

`12.38 g`

C

(c )` 34.76 g`

D

`1.238 g`

Text Solution

Verified by Experts

The correct Answer is:
A
`KMnO_(4)`= Mohr salt
`(M_(1)V_(1))/1=(M_(2)V_(2))/5`
`=[W/(MxxV)xx1000]xxV_(2)/5`
`[(Wxx1000)/(58xx1000)]xx18= (3.92xx1000)/(392xx1000)xx20/5 W=3.476 g//L`.
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