Given below are two statements:
Statement (I): Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement (II): In this titration phenolphthalein can be used as indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement (I): Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement (II): In this titration phenolphthalein can be used as indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:
- (A)Both Statement I and Statement II are correct✓ Correct
- (B)Statement I is correct but Statement II is incorrect
- (C)Statement I is incorrect but Statement II is correct
- (D)Both Statement I and Statement II are incorrect
Answer: (A)
Solution
Potassium hydrogen phthalate (KHP) is a primary standard for standardising NaOH solution because it is stable, non-hygroscopic, of high purity and known composition. In this acid-base titration (weak acid vs strong base), the equivalence point is on the basic side, so phenolphthalein (colour change range pH 8.3-10) is the correct indicator. Both statements are correct.
JEE Main · 2024 · 01 Feb 2024 · Shift 1 · Single correct option