The elements of group $1$ are called alkali metals because :

their oxides form acidic solutions on treating with water

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their peroxides form alkaline solutions on treating with water

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their oxides and hydroxides form alkaline solutions on treating with water

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their hydroxides form acidic solutions on treating with water

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Solution

The correct option is D their oxides and hydroxides form alkaline solutions on treating with water
The elements of group $1$ are called alkali metals because their oxides and hydroxides form alkaline solutions on treating with water. Therefore, the solution becomes basic or alkaline due to the formation of hyroxide ions.

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The elements of group 1 are called alkali metals because :

The elements of group $1$ are called alkali metals because :