Question

a gas evolved on reaction of aluminium with boiling concentrated caustic alkali solution​

Answer 1

Answer: The gas released is hydrogen gas.

Explanation:

Caustic soda is the common name for sodium hydroxide. The chemical formula for this soda is NaOH.

When aluminium is reacted with concentrated caustic soda, it forms a salt and releases gas.

The equation for the above reaction follows:

$2Al+2NaOH+2H_2O\rightarrow 2NaAlO_2+3H_2$

By Stoichiometry of the reaction:

2 moles of aluminium reacts with 2 moles of sodium hydroxide and 2 moles of water to produce 2 moles of sodium aluminate salt and 3 moles of hydrogen gas.

Hence, the gas released is hydrogen gas.

Answer 2

Explanation:

nswer: The gas released is hydrogen gas.

Explanation:

Caustic soda is the common name for sodium hydroxide. The chemical formula for this soda is NaOH.

When aluminium is reacted with concentrated caustic soda, it forms a salt and releases gas.

The equation for the above reaction follows:

2Al+2NaOH+2H_2O\rightarrow 2NaAlO_2+3H_22Al+2NaOH+2H

2

O→2NaAlO

2

+3H

2

By Stoichiometry of the reaction:

2 moles of aluminium reacts with 2 moles of sodium hydroxide and 2 moles of water to produce 2 moles of sodium aluminate salt and 3 moles of hydrogen gas.

Hence, the gas released is hydrogen gas