JEE Main 2020 (3 Sep, Shift 2) Chemistry Q27: pH and Buffers

Question

100 mL of 0.1 M $\mathrm{HCl}$ is taken in a beaker and to it 100 mL of 0.1 M $\mathrm{NaOH}$ is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH ?

Accepted Answer

Option 1: [figure: graph of pH vs vol. of NaOH, S-shaped curve rising from below the dashed pH 7 line to above it, crossing it in the steep part]

Answer

[figure: graph of pH vs vol. of NaOH, S-shaped curve rising from below the dashed pH 7 line to above it, crossing it in the steep part]

Answer

[figure: graph of pH vs vol. of NaOH, S-shaped curve rising and levelling off at about the dashed line marked 7]

Answer

[figure: graph of pH vs vol. of NaOH, straight line rising and crossing the dashed pH 7 line]

Answer

[figure: graph of pH vs vol. of NaOH, curve starting at the dashed line marked 7 and falling to a lower level where it flattens]

JEE Main 3 September 2020, Shift 2, Chemistry Q27

Same idea in other shifts