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 and give the reaction involved.
Alkali metal (A) is sodium (Na) which forms NaOH (compound B) with water. The reaction can be written as:
$2Na+2H_2O→2NaOH+H_2$
NaOH reacts with aluminium oxide (Al2O3 ) to form sodium aluminate (compound C) with the chemical formula NaAlO2.The reaction can be written as:
$Al_2O_3 +2NaOH →2NaAlO_2+H_2O$
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