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JAMB Chemistry 2014 Paper

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Question : 12

Total: 45

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as

efflorescence
deliquescence
hygroscopy
hydrolysis

Solution:

Concept:

Efflorescence is the loss of water of crystallization by a hydrated salt on exposure to air.

Explanation:

When a hydrated salt like

\mathrm{Na}_2\mathrm{CO}_3\cdot 10\mathrm{H}_2\mathrm{O}

is exposed to the atmosphere, it loses its water of crystallization and becomes anhydrous.

This process is called efflorescence.

Answer:

A. efflorescence

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