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The pH titration curve of $0.1 M {Na}_{2} {CO}_{3}$ solution versus 0.1 M HCI is shown in the given figure. The pH at the first and second equivalence points are 8.34 and 3.97, respectively. The steep portion at these two equivalence points are also shown in the figure. The indicators used in locating the first and second end points, respectively, are

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Methyl violet (0.1 to 3 .2) and phenolphthalein (8.3 to 10.0)

Phenolphthalein (8.3 to 10.0) and methyl orange (3.1 to 4.4)

Trinitrobenzene (12.0 to 14.0) and phenol red (6.8 to 8.4)

Methyl orange and methyl violet

answer is B.

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Detailed Solution

Phenolphthalene (pink to colourless) can locate first equivalence point as its indicator range (10.0 to 8.3) lies in the first steep change in pH. Like wise, methyl orange (yellow to red) helps locating the second equivalent point.

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