Which of the following mainly form metal oxide on heating in air?

N a

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K

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C s

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L i

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Solution

The correct option is D $L i$
Solution
These all are present in group 1 and are alkali metals
They are arranged as
Li
Na
K
Cs
Down the group Metal salts Are more stable therefore they will not form metal oxides easily
Hence Li will form metal oxide on heating
The correct option is D

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When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.

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