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Q.

Statement I:  Methyl orange is used as indicator in Na2CO3 titrating against HCI solution.Statement II:  The pH range of methyl orange is 3.1 to 4.5.

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a

Both statements I and II are correct.

b

Statement I is correct and statement II is incorrect.

c

Statement I is incorrect and statement II is correct.

d

Both statements I and II are incorrect.

answer is A.

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Detailed Solution

The pH of the solution at the neutralisation point region is about 3.5 to 7 and methyl orange gives its colour change between  pH 3.1 to 4.5.
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