Oxides of Carbon

Question 1

What is an oxide

Answer 1

An Oxide is a compound that contains only two elements, one of which
is Oxygen.

Question 2

Types of oxides

Answer 2

1. Carbon (ii) oxide ( CO )

2. Carbon (iv) oxide ( CO2 )

Question 3

Preparation of Carbon(ii)oxide

Answer 3

Lab: Using methanoic acid
Using ethanedioic acid
Preparation from charcoal

Question 4

Methanoic acid preparation of carbon(ii)oxide

Answer 4

Carbon (ii) oxide is prepared in the laboratory by gradually adding
concentrated tetraoxosulphate (vi) acid to Methanoic acid

Question 5

Ethanedioic acid preparation of carbon(ii)oxide

Answer 5

Carbon (ii) oxide is prepared in the laboratory by gradually adding
concentrated tetraoxosulphate (vi) acid to Ethanedioic acid. Heat will be applied which causes the acid to be absorbed. The carbon (iv) oxide produced can be removed by passing the gas through wash bottles containing Potassium hydroxide. Carbon(ii)oxide is collected over water.

Question 6

Preparation from charcoal

Answer 6

it is possible to obtain some quantity of Carbon(II) oxide by passing Carbon
(IV) oxide over heated charcoal in a combustion tube.

Question 7

Physical properties of carbon(ii)oxide

Answer 7

1. It is a colourless, odourless poisonous gas
2. It is slightly soluble in water
3. It boils at – 111oC
4. It does not affect blue or red litmus paper
5. It is slightly less dense than air (V.D(CO) = 14, V.D(air) = 14.4)

Question 8

Chemical properties of carbon(ii)oxide

Answer 8

1. Carbon(II) oxide does not support combustion.
2. Carbon (II) oxide is a good reducing agent.
3. Carbon (II) oxide also reduces steam to hydrogen at very temperatures
4. Carbon (II) reacts with some transition metals to form volatile carbonyl of the metal.
5. Carbon (II) oxide is a deadly, poisonous gas.

Question 9

Uses of carbon(ii)oxide

Answer 9

1. It is mainly used as a reducing agent in metallurgical industries such as in the blast furnace.
2. It is used as fuel when combined with other gases
3. It is an essential raw material in the synthesis of some chemicals

Question 10

Carbon (IV) oxide forms what percentage of air

Answer 10

Carbon (IV) oxide forms about 0.03% composition of air.

Question 11

Preparation of Carbon (IV) oxide

Answer 11

CO2 can be prepared by treating a metallic trioxocarbonate (IV) with an
acid. Effervescence is observed and a colourless gas is given off. The gas is passed into Potassium hydrogen trioxocarbonate (IV) to absorb excess acid and then passed through a U-tube containing Calcium chloride anhydrous to dry the gas. The pure gas is then collected by downward delivery being denser than air.

Question 12

Physical properties of carbon(iv)oxide

Answer 12

1. Carbon (IV) oxide is a colourless, odourless gas
2. It is denser than air( V.D(CO2)=22, V.D(air)=14.4)
3. It is soluble in water, producing a weakly acidic solution
4. It turns moist blue litmus faintly red

Question 13

Chemical properties of carbon(iv)oxide

Answer 13

1. Carbon (IV) oxide does not generally support combustion.
2. Carbon (IV) oxide is slightly acidic.
3. Carbon (IV) oxide turns lime water milky.
4. Carbon (IV) oxide also reacts readily with bases like Sodium hydroxide producing Sodium trioxocarbonate (IV) and water.

Question 14

Uses of Carbon(iv)oxide

Answer 14

1. Carbon (IV) is used as active ingredient in fire extinguishers.
2. Carbon (IV) oxide is used in the manufacture of fizzy drinks
3. Solid carbon (IV) oxide is used as refrigerants.
4. Carbon (IV) oxide can be used to preserve fruits.