Chemistry Ionic Equilibrium Hydrogen Ion Concentration- pH Scale and Buffer Solution Single Correct MCQ
Published on: August 12, 2026

of and of are mixed. The resulting solution will

A
Be neutral
B
Be basic
C
Turn phenolphthalein solution pink
D
Turn methyl orange red

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Text Solution

Verified by Experts
The correct answer is:
C

(i) 20 ml of 0.5 N HCl

is present in

(ii) 35 ml of 0.1 N NaOH

of 0.1 mole is 35 ml

Total = 20 + 35 = 55 ml.

(1.0–0.35)10 –2 =0.65 × × 10 –2 mole HCl

HCl = H + +Cl –

[ HCl ] = [ H + ]+[ Cl – ]

55 ml contains 0.65 × × 10 –2 mole of H + ions

Due to acidic nature of solutions the colour of phenolphthalein becomes pink.

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