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Assertion: In the titration of Na(2)CO(3...

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.

Text Solution

Verified by Experts

The correct Answer is:
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`
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