JEE Main 2026 · 5 Apr · Shift 1 · Chemistry Q56

ChemistrySingle correct+4 / -1Question 56 of 75

Arrange the following resultant mixtures in increasing order of their pH values

A. 10 mL 0.2 M $\ce{Ca(OH)2}$ + 25 mL 0.1 M HCl

B. 10 mL 0.01 M $\ce{H2SO4}$ + 10 mL 0.01 M $\ce{Ca(OH)2}$

C. 10 mL 0.1 M $\ce{H2SO4}$ + 10 mL 0.1 M KOH

Choose the correct answer from the options given below:

B < C < A

C < A < B

C < B < A

A < C < B

Answer and worked solution

Official answer: C

Each mixture (in mmol).

A: $\ce{OH-}=10\times0.2\times2=4$ and $\ce{H+}=2.5$ , so 1.5 mmol $\ce{OH-}$ is left: basic.
B: $\ce{H+}=10\times0.01\times2=0.2$ and $\ce{OH-}=0.2$ : neutral.
C: $\ce{H+}=10\times0.1\times2=2$ and $\ce{OH-}=1$ , so 1 mmol $\ce{H+}$ is left: acidic.

Increasing pH: C < B < A.

(C)

Topics:pH and ionisation

JEE Main 2026 · 5 Apr · Shift 1, Chemistry question 56