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A mixture contaning 0.05 moleof K(2)Cr(2...

A mixture contaning 0.05 moleof `K_(2)Cr_(2)O_(7) and 0.02 "mole of" KMnO_(4)` was treated eoith excess of KI in acidic medium. The liberated iodine required `1.0L "of" Na_(2)S_(2)O_(3)` solution for titration. Concentration of `Na_(2)S_(2)O_(3)` solution was:

A

1000 mL

B

1200 mL

C

1500 mL

D

800 mL

Text Solution

Verified by Experts

The correct Answer is:
B
`BrO_(3)^(-)+6I^(-)rarr3I_(2)+Br^(-)`
moles of `I_(2)=3xx`moles of `KBrO_(3)`
`:. ` moles of `I_(2)=0.02xx3=0.06`
Eq of `I_(2)`=Eq of Hypo
`0.06xx2=0.1xxV`
V=1.2 L = 1200 mL.
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