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(a). IF both (A) and (R) are correct and...

(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.
(e) if both (A) and (R) are incorrect.
Assertion (A): In the titration of `Na_(2)CO_(3)` with HCl using methyl orange indicator the volume required at the equivalence point is twice that of the acid required using phenolphthalein indicator.
Reason (R): 2 " mol of "HCl are required for complete neutralization of one mole of `Na_(2)CO_(3)`.

Text Solution

Verified by Experts

The correct Answer is:
B
`Na_(2)CO_(3)+"HCl"toNaHCO_(3)+NaCl`
At this point phenolphthalein changes colour but when methyl orange is used as an indicator it changes colour when complete reaction takes place.
`Na_(2)CO_(3)+2"HCl"to2NaCl+CO_(2)+H_(2)O`
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