Methyl orange (colour change range pH 3.1 to 4.4) is a suitable indicator for the titration of

A $CH X_{3} COOH$ with NaOH
BHCN with NaOH
CHCl with aqueous $NH X_{3}$
DNaOH with $CH X_{3} COOH$

Answer: C

The equivalence point must lie in the indicator range. A strong acid with a weak base gives an acidic salt solution (

NH X_{4} Cl

, pH about 5) so the steep part of the curve is in the acidic region, suited to methyl orange. Titrations that end with a basic salt need phenolphthalein.

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