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Question

Assertion :The titration curve for weak acid and weak base has no sharp change. For this titration no suitable indicator is present. Reason: Indicator should change it's colour sharply for indication of reaction to be complete so its pH-range should lie perfectly with in sharp change to avoid experimental error.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When indicator changes it's color sharply near the equivalence point, it indicates the completion of reaction.
This is possible when pH-range lies perfectly within sharp change. This avoids experimental error.
The titration curve for weak acid and weak base has no sharp change.
Hence, for this titration no suitable indicator is present.

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