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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 appropriate explanation for (A).
(b). If both (A) and (R) are correct and (R) is 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.
Q. 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 requried using phenolphthalein indicator.
Reason (R): Two moles of HCl is requried for the complete neutralisation of 1 " mol of "`Na_(2)O_(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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