Alkali metal when exposed to air tarnish quickly due to the ________.

formation of their hydroxides

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formation of their carbonates

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formation of their oxides

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all the above

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Solution

The correct option is D all the above
When exposed to air, the alkali metals tarnish quickly. This is because, they react with oxygen, moisture and carbon dioxide present in air to form oxides, hydroxides and carbonates.

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Silver articles turn black when exposed to the atmosphere for a few days due to the formation of silver sulphide.

N H_{3}

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