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Assertion: In an acid-base titration involving strong base and a weak acid, methyl orange can be used as an indicator.

Reason: Methyl orange changes its colour in pH range of 7 to 9.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

1 Answer

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Correct option  (d) A and R are false

Explanation:

In a titration of strong base and weak acid phenolphthalein is used as indicator. Methyl orange changes its colour in pH of range 3 to 5.

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