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NTA Abhyas NEET2020Chemistryp Block Elements (Group 13 & 14)Practice

Which of the following statements is not true about potash alum?

Options

  1. AIts empirical formula is K A l ( S O 4 ) 2 . 12 H 2 O
  2. BIts aqueous solution is basic in nature
  3. CIt is used in dyeing industry
  4. DOn heating, it melts in its water of crystallization

Correct answer

B. Its aqueous solution is basic in nature

Step-by-step solution

Here statement B is incorrect as its aqueous solution is acidic in nature, due to hydrolysis of A l 2 ( S O 4 ) 3 . However, K 2 S O 4 does not hydrolyse. Potash alum is K 2 S O 4 . A l 2 ( S O 4 ) 3 . 24 H 2 O which is used in dyeing industry and on heating, it melts in its water of crystallization.

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