Question

A) Complete the reactions-

I) Aluminium reacts with steam

II) Potassium reacts with water

III) Sodium oxide react with water

B) Name the metals which don't react with water at all. (Any two)

C) Name the metals which even react with cold water. (Any two)​

Answer 1

Answer:

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Explanation:

Iron metal does not react with cold as well as hot water but reacts with steam.

(ii) Metals such as lead, copper, silver and gold do not react with water at all

(b) More heat is evolved during the reaction of sodium metal with water due to which the hydrogen gas formed catches fire. On the other hand, less heat is evolved during the reaction of calcium metal with water which cannot make hydrogen gas burn.

Answer 2

I) Like the reaction between magnesium and water, it is possible to react aluminium with steam. However, the aluminium oxide produced forms a barrier on the surface of the aluminium which prevents further reaction.

Aluminium briefly reacts with steam as a protective oxide barrier is produced preventing any more reaction

When aluminium reacts with steam, the products are aluminium oxide and hydrogen gas.

Aluminium + Steam → Aluminium oxide + Hydrogen
2Al + 3H2O → Al2O3 + 3H2

II)