Question

Assertion: In the titration of `Na_(2)CO_(3)` with `HCl` using methyl orange indicator, the volume of acid required is twice that of the acid required using phenolphthalein as indicaton.
Reason: Two moles of `HCl` are required for the complete neutralisation of one mole of `Na_(2)CO_(3)`.
A. If both (A) and (R) are correc, 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.

Answer 1

Correct Answer - B
Both `(A)` and `(R)` are correct but `(R)` is not the correct explanation of `(A)`.
Correct `R: Na_(2)CO_(3)` reacts with `HCI` upto the stage of `NaHCO_(3)` in the presence of phenolphthalein.
`Na_(2)CO_(3) + HCI rarr NaHCO_(3) + NaCI`