Statement I : Sodium dichromate and potassium dichromate are classified as primary standard in titrimetric analysis .
Statement II : Phenolphthalein is a weak base, therefore it dissociates in acidic medium.
In the light of the above statements, choose the correct answer from the options given below
Statement II : Phenolphthalein is a weak base, therefore it dissociates in acidic medium.
In the light of the above statements, choose the correct answer from the options given below
- (A)Both Statement I and Statement II are true
- (B)Both Statement I and Statement II are false✓ Correct
- (C)Statement I is true but Statement II is false
- (D)Statement I is false but Statement II is true
Answer: (B)
Solution
A primary standard must be pure, stable and non-hygroscopic; potassium dichromate qualifies, but sodium dichromate is deliquescent and takes up moisture, so it cannot serve as a primary standard, and Statement I, which admits both, is false. Phenolphthalein is a weak organic acid, colourless in its un-ionised acidic form and pink in base; calling it a weak base that dissociates in acid is wrong, so Statement II is false. Both statements are false.
JEE Main · 2026 · 05 Apr 2026 · Shift 1 · Single correct option