Question

An alkali metal A gives a compound B (Molecular mass=40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A,B and C. Give the reactions involved

Answer 1

A is Sodium
B is Sodium hydroxide
C is Sodium aluminate
Na + H2O = NaOH
NaOH + Al2O3 = NaAlO2 + H2O
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