Properties of CO2

Q.

Carbon dioxide is heavier than oxygen.

1. Very small, the layers being tightly packed

2. Many times larger than the covalent radius of carbon

Q. extinguishers help extinguish fires by cutting the supply of oxygen.

1. Carbon dioxide
2. Oxygen
3. Hydrogen

Q.

Carbon dioxide is an odourless gas.

1. True

2. False

Q.

Which is the best absorbing material for carbon dioxide?

1. Cold, solid calcium chloride

2. Heated copper oxide

3. Cold, solid calcium hydroxide

4. Heated charcoal

Q.

What happens when :

(a) A lit splinter is introduced into a jar containing carbon dioxide?

(b) Moist blue litmus paper is placed in a jar containing carbon dioxide?

(c) Carbon dioxide is passed through lime water first in small amounts and the excess?

(d) A baking mixture containing baking powder is heated?

(e) A soda water bottle is opened?

Q. A powder X is burnt in a deflagrating spoon and heated, as soon as it starts burning it is introduced in a glass jar taking care that the gas does not escape. A small amount of water is added to the jar and shaken well, it forms solution Y. Identify X and Y.

Q.

Suppose you have to determine the percentage of carbon dioxide in a sample of gas available in a container. Which among the following is the best absorbing material for carbon dioxide?

1. Heated copper oxide

2. Cold, solid calcium chloride

3. Cold, solid calcium hydroxide

4. Heated charcoal

Q.

Carbon dioxide is used for extinguishing fire.

1. False

2. True

Q. Carbon dioxide extinguisher helps extinguish fire by:

1. cutting the supply of oxygen.
2. reducing the heat of surroundings.
3. limiting the supply of fuel.
4. cutting the supply of nitrogen.

Q. The melting point of carbon dioxide gas is _____.

1. $28.4{}^{0}C$
2. $48.6{}^{0}C$
3. $-56.6{}^{0}C$
4. $0{}^{0}C$

Q. Manganese dioxide reacts with dilute hydrochloric acid and produces Manganese chloride, water and chlorine.

(a) Express the above reaction in the form of a balanced chemical reaction

Q.

Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which is the best absorbing material for the carbon dioxide

1. Heated copper oxide

2. Cold, solid calcium chloride

3. Cold, solid calcium hydroxide

4. Heated charcoal

Q.

Are you aware of the term used for the phenomena where $O_2$ displaces $C{O}_2$ in lungs?

1. Goodwin effect

2. Bohr theory

3. Haldane effect

4. Murray phenomenon

Q.

Carbon dioxide is responsible for:

1. landslides
2. ozone depletion
3. soil erosion
4. global warming

Q.

If there was no $C{O}_2$ in the earth’s atmosphere, the temperature of the earth’s surface would be ______

1. the same

2. less than the present level

3. more than the present level

4. dependent upon the oxygen amount of the environment

Q.

What will you obtain on reaction of calcium carbonate with dilute sulphuric acid?

1. Calcium sulphate, water and carbon dioxide

2. Calcium sulphate, sulphur dioxide and carbon dioxide

3. Calcium hydroxide, water and sulphur dioxide

4. Calcium sulphate, water and sulphur dioxide

Q. Do all materials give same colour when we burnt them

Q.

We get to see nitric acid in combined state in the salts of ___________

1. Mineral salts of nitrides

2. Mineral salts of nitrites

3. Mineral salts of nitrates

4. Mineral salts of nitrous

Q.

Which phenomenon is used to explain the displacement of $C{O}_2$ by $O_2$ in the human lungs?

1. Goodwin effect

2. Bohr theory

3. Haldane effect

4. Murray phenomenon

Q. what information is obtained from the followingchemical equation?
caco3+2hcl = cacl2 + h2o + co2

Q.

Excess of carbon dioxide can kill a person:-

1. True

2. False

Q.

Explain why chlorine turns moist starch iodide paper blue -black

Q.

We all love carbonated drinks. We know that Carbon dioxide is dissolved in water to make that drink. But if I try to push in more and more carbon dioxide into water at the same temperature, what would happen?

1. It will keep dissolving till infinity.
2. The carbon dioxide molecules will destroy water molecules.
3. After a point, carbon dioxide will become carbon monoxide.
4. After a certain point, carbon dioxide gas simply won't dissolve. It will bubble out.

Q.

Which of the following is true about $C{O}_2$?

1. It is a colourless, odourless and tasteless gas

2. It dissolves in water to form carbonic acid.

3. It reduces to CO When passed through red hot coke

4. It can turn lime water milky