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Question

The compound formed upon combustion of Na in excess air is

A

Na2O2

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B

Na2O

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C

NaO2

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D

NaOH

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Solution

The correct options are
A

Na2O2


B

Na2O


4Na + 2O2 2Na2O2

In excess air it forms a peroxide.

4Na + O2 2Na2O

In limited supply of air it forms sodium oxide.


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