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Ionic Radii and Ionisation Enthalpy (Group 2)

Alums are not...

Question

Alums are not formed by which alkali metal?

A

Li

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B

K

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C

Na

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D

Cs

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Solution

The correct option is A Li
Alums are double sulphate salts with the formula,AM(SO4)2.12H2O where A is a monovalent cation like potassium or ammonium & M is a trivalent cation like aluminium or chromium.These crystallise in octahedral crystal structures can accommodate ions of only specific size.Size of lithium is small as comparison to potassium & ammonium & therefore cannot be accommodated in the crystalline structure.

Lithium will not form alum

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