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Question

Which of the following bases are alkalis?


A

Sodium hydroxide

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B

Potassium hydroxide

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C

Aluminium hydroxide

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D

Copper hydroxide

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Solution

The correct options are
A

Sodium hydroxide


B

Potassium hydroxide


The bases that dissolve in water and generate hydroxyl ion [(OH)] are called alkalis.

Sodium hydroxide and potassium hydroxide are alkalis as they are water soluble. Aluminium hydroxide and copper hydroxide do not dissolve in water and are non-alkalis.


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