1.

10 " mL of " a solution of H_(2)O_(2) of 10 violume strength decolourises 100 " mL of " KMnO_(4) solution acidified with dil H_(2)SO_(4). The amount of KMnO_(4) in the given solution is K=39, Mn=55)

Answer»

0.282 g
0.564 g
1.128g
0.155 g

Solution :VOLUME of `O_(2)` at STP`=10mLxx10V=100mL`
`22400" mL of " O_(2) at STP =1 mol=4Eq`
`100 " mL of " O_(2) STP=(4)/(22400)xx100=(1)/(56)EQ`
" Eq of "`KMnO_(4)=" Eq of "O_(2)`
`=(1)/(56)" Eq of "KMnO_(4)`
`=(1)/(56)xx31.5g of KMnO_(4)`
`=0.564g`
`(Ew of KMnO_(4)` in acidic medium `=(MW)/(5)=31.5`)


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