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  • Identify the correct statement.  A. The oxides and the peroxides of alkali metals are colorless when pure. B. Alkali metal oxides are hydrolysed by water to form the hydrox

Identify the correct statement. 

A. The oxides and the peroxides of alkali metals are colorless when pure.

B. Alkali metal oxides are hydrolysed by water to form the hydroxides.

C. The superoxides of alkali metals are yellow or orange in color.

D. The superoxides of alkali metals are diamagnetic.

Option: 1

A and C only

 


Option: 2

D only

 


Option: 3

A, B and C only

 


Option: 4

A, B, C and D


Answers (1)

best_answer

The oxides and the peroxides of alkali metals are colorless when pure. The superoxides of alkali metals are yellow or orange in color and are paramagnetic. 

Oxides are hydrolysed by water to form the hydroxides.

\mathrm{M}_2 \mathrm{O}+\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{M}+2 \mathrm{OH}^{-}

Superoxide of alkali metals are paramagnetic as superoxide ion \mathrm{O}_2 ^{-} has three electron bonds i.e. it has one unpaired electron which makes it paramagnetic.

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shivangi.bhatnagar

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