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Question

Chemistry Question on GROUP 1 ELEMENTS

When sodium reacts with excess of oxygen oxidation number of oxygen changes from

A

0 to - 1

B

0 to - 2

C

1 to -2

D

#ERROR!

Answer

0 to - 1

Explanation

Solution

When sodium reacts with excess of oxygen, it leads to the formation of sodium peroxide. Na+O2→Na2O2Na + O _{2} \rightarrow Na _{2} O _{2} Hence there is a change in oxidation state from o to −1-1.