Which amongst the following substance is an alkali?

Calcium hydroxide

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Copper hydroxide

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Aluminium hydroxide

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Sodium hydroxide

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Solution

The correct option is D
Sodium hydroxide

The bases which are soluble in water are known as alkalis. For example sodium hydroxide, potassium hydroxide, etc. These compounds show basic behaviour when dissolved in water.
All bases are not soluble in water. For example ammonium hydroxide, calcium hydroxide and copper hydroxide. Hence, these bases are not alkalies.

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