Question

Two statements are given below: I. Sodium hexametaphosphate is used in calgon method for removal of permanent hardness of water II. Lithium forms interstitial hydrides Identify the correct answer

• A. Both statements I and II are correct
• B. Both statements I and II are not correct
• C. Statement I is correct but statement II is not correct
• D. Statement I is not correct but statement II is correct

Hint:

Sodium hexametaphosphate (calgon) reacts with calcium and magnesium ions in hard water to form soluble complexes, removing hardness.

Answer 1

The Correct Option is C

- Statement I is correct because sodium hexametaphosphate is used to remove permanent hardness of water in the calgon method. - Statement II is incorrect because lithium generally forms covalent hydrides, not interstitial hydrides. Thus, the correct answer is (3).