Question

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:

• A. Both Statement I and Statement II are 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 1

The Correct Option is A

Statement (I) is correct as potassium hydrogen phthalate serves as a reliable primary standard due to its stable and non-hygroscopic properties.

Statement (II) is also correct as phenolphthalein is a suitable indicator for acid-base titrations, exhibiting a color change in the pH range of 8.3 to 10.1.