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Q.

Indicator range of methyl red is

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a

4.2 to 6.3

b

8.3 to 10.0

c

5.0 to 7.0

d

12.0 to 14.0

answer is A.

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Detailed Solution

Indicator range of methyl red is 4.2 to 6.3

When a strong base and a weak acid are used in an acid-basic titration, methyl orange can be employed as an indicator since it changes color in the pH range of 4.2 to 6.3. Its color changes in the pH range of 3 to 5 (explanation).

Hence the correct option is A.

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