Question

21. In the reaction :

MnO, + 4HCI MnCl2 + 2H2O + Cl2

(a) Name the compound (i) oxidised, (ii) reduced.

(b) Define oxidation and reduction on its basis.

OR

Explain the action of dilute hydrochloric acid on the following with chemical equation :

(i) Magnesium ribbon
(ii) Sodium hydroxide
(iii) Crushed egg shells
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Answer 1

Explanation:

a. Here hcl is oxidised to cl2 and Mno2 is reduced to Mncl2.

2. the reaction in which oxygen is either gained or hydrogen is lost by the substance is called oxidation reaction.

The reaction in which hydrogen is gained or oxygen is lost by substance is called reduction reaction.

hope it HElp you

Answer 2

Explanation:

(a) HCl is oxidized and MnO is reduced

(b) Oxidation - Any process which involves addition of oxygen or removal of hydrogen is called Oxidation reaction.

Reduction- Any process which involves removal of oxygen and addition of hydrogen is called reduction.

OR

(1) Mg(s) + 2 HCl(aq) ------> MgCl 2(aq) + H 2(g)

(2) NaOH + HCl ------> NaCl + H20

(3) HCl + CaCO3 --------> CaCl + CO2 + H2O