Question

Match the statements in Column A with those in Column II.

Column 1	Column 2
A mixture of oxygen and carbon dioxide used for artificial respiration	Manganese dioxide
A compound which on strong heating yields oxygen gas.	Sodium
The process of coating zinc on the surface of iron to prevent rusting.	Carbogen
A catalyst used in laboratory preparation of oxygen from hydrogen peroxide	Potassium nitrate
A metal which burns a golden yellow flame in oxygen	Galvanising

Answer 1

(A) A mixture of oxygen and carbon dioxide used for artificial respiration - (iii) Carbogen

• Carbogen is a combination of carbon dioxide and oxygen
• It is used to accelerate breathing in people who have respiratory problems.

(B) A compound which on strong heating yields oxygen gas - (iv) Potassium nitrate

• Potassium nitrate crystals on heating strongly, yield potassium nitrite and oxygen gas.
• The given reaction is:

$\underset{\mathrm{Potassium}\mathrm{nitrate}\mathrm{Potassium}\mathrm{nitrite}\mathrm{Oxygen}}{2{\mathrm{KNO}}_3\stackrel{∆}{\to }2{\mathrm{KNO}}_2+{\mathrm{O}}_2}$

(C) The process of coating zinc on the surface of iron to prevent rusting. - (v) Galvanising

• The process of adding a protective zinc coating to steel or iron to prevent rusting is known as galvanization or galvanising.
• The zinc coating is applied using the hot dip electroplating process. Zinc prevents the formation of an oxide layer on iron, which leads to rust in the presence of air and water.

(D) A catalyst used in laboratory preparation of oxygen from hydrogen peroxide - (i) Manganese dioxide

Oxygen is prepared in laboratory by treating hydrogen peroxide with manganese dioxide.

• The given reaction is:
• $\underset{\mathrm{Hydrogen}\mathrm{peroxide}\mathrm{Water}\mathrm{Oxygen}}{2{\mathrm{H}}_2{\mathrm{O}}_2\underset{\mathrm{Catalyst}}{\overset{{\mathrm{MnO}}_2}{\to }}2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2}$

(E) A metal which burns a golden yellow flame in oxygen - (ii) Sodium

Sodium burns in oxygen with a golden yellow flame.

• The given reaction is:
• $\underset{\mathrm{Sodium}\mathrm{Oxygen}\mathrm{Sodium}\mathrm{oxide}}{4\mathrm{Na}+{\mathrm{O}}_2\to 2{\mathrm{Na}}_2\mathrm{O}}$

Column I	Column II
(A) A mixture of oxygen and carbon dioxide used for artificial respiration	(iii) Carbogen
(B) A compound which on strong heating yields oxygen gas	(iv) Potassium nitrate
(C) The process of coating zinc on the surface of iron to prevent rusting	(v) Galvanising
(D) A catalyst used in laboratory preparation of oxygen from hydrogen peroxide	(i) Manganese dioxide
(E) A metal which burns a golden yellow flame in oxygen	(ii) Sodium