1. A metal A when burnt in air forms its oxide B .This oxide B dissolves in water to form a base .What are A and B ?

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Solution

The given metal is sodium i.e. A.
Sodium on reaction with oxygen, or we can say sodium on combustion forms sodium oxide.
Hence compound B is sodium oxide.
Sodium oxide when treated with water forms a strong base i.e. Sodium hydroxide.
A = Sodium = Na
B = Sodium oxide = Na₂O
The reaction involved is as follow:-
2 Na + O₂ ----> Na₂O
Na₂O + H₂O -----> 2 NaOH

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