Question

When Al is added to KOH solution
(a) no action takes place
(b) oxygen is evolved
(c) water is produced
(d) hydrogen is evolved

Answer 1

(d) hydrogen is evolved

Answer 2

In the reaction of aluminium with KOH, the hydrogen gas is evolved.

Explanation:

Every balanced chemical equation follows law of conservation of mass.

A balanced chemical equation is the equation where total number of individual atoms on the reactant side is always equal to the total number of individual atoms on product side.

The balanced chemical equation for the reaction of aluminium and potassium hydroxide follows:

$2Al+6KOH\rightarrow 2KAlO_2+2K_2O+3H_2$

By Stoichiometry of the reaction:

2 moles of aluminium reacts with 6 moles of potassium hydroxide to produce 2 moles of potassium aluminate, 2 mole of potassium oxide and 3 moles of hydrogen gas

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