(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A).
(b). If both (A) and (R) are correct but (R) is not the correct explanation of (A).
(c). If (A) is correct, but (R) is incorrect.
(d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect.
Q. Assertion (A): if x " mL of " 0.1 M `KMnO_(4)` solution requires 100 " mL of " 0.1 M CuS solution for complete neutralisation then x " mL of " same `KMnO_(4)` solution would require `75` " mL of " 0.1 M `Cu_(2)S` solution.
Reason (R): n factor for Cus and `Cu_(2)S` respectively are 6 and 8.

Answer

A

Explanation

Both (A) and (R) are true and (R) is the correct explanation of (A).
(i). `m" Eq of "MnO_(4)^(ɵ)-=m" Eq of "Cus`
`(S^(2-)toSO_(2)+6e^(-))`
`(Cu^(2+)to` no change)
`x xx0.1xx5-=100xx0.1xx6`
`x=120mL`