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Q.

Which acid-base indicator will give the best results for the titration of an aqueous ammonia solution with 0.10 M HCI?

IndicatorColour ChangepH range
Methyl violet red ⟶ blue 0⟶2
Methyl red red ⟶ yellow 4⟶6
Cresol red yellow ⟶ purple 7⟶9
Phenolphthalein colourless ⟶ pink 8⟶10

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a

Methyl violet

b

Methyl red

c

Cresol red

d

Phenolphthalein

answer is B.

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Detailed Solution

When evaluating the pH variations in acidic solutions, methylene red is helpful.

At end point, pH<7. 

Hence, methyl red is most suitable.

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