JEE Main 2022 · 27 Jul · Shift 2 · Chemistry Q63

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ChemistrySingle correct+4 / -1Question 63 of 90

The plot of pH-metric titration of weak base $\mathrm{NH_4OH}$ vs strong acid HCl looks like :

pH starts above 7 and falls smoothly, steepening around the equivalence point, to a low value

pH against volume of acid: starts above 7 and falls in a smooth reverse S to a low value.

pH starts low and rises in an S-shape to a high value

pH against volume of acid: starts low and rises in an S-shape.

pH stays high, drops vertically, then stays low

pH against volume of acid: flat high, sharp vertical drop, then flat low.

pH stays low, rises vertically, then stays high

pH against volume of acid: flat low, sharp vertical rise, then flat high.

Answer and worked solution

Official answer: A

Weak base vs strong acid. pH starts near 11 and falls gradually (buffer region), then drops steeply at the equivalence point, which is on the acidic side.

(A)

Topics:Indicators and titrations

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JEE Main 2022 · 27 Jul · Shift 2, Chemistry question 63