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Q.

Alkali metals when exposed to air tarnish quickly due to the 
 

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a

Formation of their oxides 
 

b

Formation of their hydroxides 
 

c

All the above 
 

d

Formation of their carbonates 
 

answer is D.

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Detailed Solution

  • Alkali metal (Sodium )is ordinarily quite reactive with air. It reacts with water vapour content in the air to give sodium hydroxide film. In ordinary air, sodium metal reacts to form a sodium hydroxide (NaOH) film, which can rapidly absorb carbon dioxide (CO2) from the air, forming sodium bicarbonate NaHCO3.
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