Question

Metal A belongs to 3rd period and 13th group in the modern periodic table of elements. A reacts with steam in red hot condition to form compound B. A also reacts with strong alkali (NaOH) to form compound C. Find A, B and C. Write appropriate balanced chemical reactions
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Answer 1

Explanation:

A belongs to 3rd period and 13th group so it's electronic configuration is 2,8,3.

So the atomic number is 13.

A is Aluminium.

Red hot aluminium reacts with steam to form aluminium oxide and hydrogen gas.

2Al(s) + 3H2O(g) -------> Al2O3(s) + 3H2(g)

So B is Aluminium oxide.

Al2O3 reacts with NaOH to form Sodium aluminate and water.

Al2O3(s) + 2NaOH(aq) ---------> 2NaAlO2(aq) + H2O(l)

So C is sodium aluminate.

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