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

Which is the correct formula for alum?

Options

  1. AK 2 S O 4 . A l 2 ( S O 4 ) 3 . 24 H 2 O
  2. BK 4 [ F e ( C N ) 6 ]
  3. CK 2 S O 4 . A l 2 ( S O 4 ) 3 . 6 H 2 O
  4. DN a 2 C O 3 . 10 H 2 O

Correct answer

A. K 2 S O 4 . A l 2 ( S O 4 ) 3 . 24 H 2 O

Step-by-step solution

General formula for alum is M 2 S O 4 . R 2 ( S O 4 ) 3 . 24 H 2 O M = monovalent cation ( K + , N a + . . . . ) R = Trivalent cation ( A l + 3 , F e + 3 ) Hence, K 2 SO 4 . Al 2 ( SO 4 ) 2 .24 H 2 O represent an alum.

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