A good indicator must possess which of the following characteristics?

The colour change should be sharp.

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The colour change should be clear.

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It must be sensitive to the equivalence point.

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All of the above.

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Solution

The correct option is A All of the above.
Indicators
These are the substances, that by a sharp colour change, indicate the completion of a chemical reaction. These are frequently used in volumetric analysis. Indicators for titration of acids and bass are usually weak acids or bases, yielding ions of a different colour from the unionised molecule
A good indicator must possess the following two essential characteristics :
(i) The colour change of the indicator must be clear and sharp i.e., it must be sensitive at equivalence point.
(ii) The $p H$ range over which the colour change takes place must be such as to indicate when the reaction is complete.

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