No indicator can be used for the titration between formic acid and ammonium hydroxide because:

formic acid is weak acid and ammonium hydroxide is weak base

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formic acid is weak acid and ammonium hydroxide is strong base

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formic acid is strong acid and ammonium hydroxide is weak base

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formic acid is strong acid and ammonium hydroxide is strong base

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Solution

The correct option is A formic acid is weak acid and ammonium hydroxide is weak base
Formic acid is weak acid and ammonium hydroxide is weak base, hence there will not be any certain change in pH when they are titrated and no indicator can be used for the titration.

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