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Assertion :In the titration of Na2CO3 with HCl using methyl orange indicator, the volume of acid required is twice that of the acid required using phenolphthalein as indicator. Reason: Two moles of HCl is required for the complete neutralisation of one mole of Na2CO3.

A
Assertion is correct but Reason is wrong
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B
Assertion is wrong but Reason is correct
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C
Both Assertion and Reason are correct and Reason is correct explanation of Assertion
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D
Both Assertion and Reason are correct but Reason is not correct explanation of Assertion
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Solution

The correct option is D Both Assertion and Reason are correct but Reason is not correct explanation of Assertion
Methyl orange indicates at complete neutralisation while phenolphthalein indicates at first equivalence point. So, volume of acid required is twice in case of methyl orange.
Methyl orange is used for the following reaction:
Na2CO3+2HCl2NaCl+H2O+CO2
Phenophthalein is used for the following reaction:
Na2CO3+HClNaHCO3+NaCl+CO2

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