`KMnO_4` reacts with `Na_2S_2O_3` in acidic, strongly basic and aqueous (neutral) media. `100mL` of `LMnO_4` reacts with 100 mL of 0.1 M `Na_2S_2O_3` in acidic, basic and neutral media.
Q. The molarity `(M)` of `KMnO_4` solution in the acidic medium is

Options

A. 0.2 M
B. 0.02M
C. 0.4 M
D. 0.04 M

Answer

b

Explanation

`MnO_4^(ɵ)-=S_2O_3^(2-)(2S_2O_3^(2-)toS_4O_6^(2-)+2e^(ɵ))`
`(n=(2)/(2)=1)`
`100mLxxN-=100mLxx0.1xx1` (n factor)
`N=0.1`
`M=(0.1)/(n "factor")=(0.1)/(5)=0.02M`