Properties of Carbon Dioxide

Q.

The burning of natural gas is an ____________. (exothermic reaction/ endothermic reaction)

Q.

Give one example of an endothermic reaction

Q.

Burning of coal is an exothermic reaction.

1. True
2. False

Q.

Classify the following reaction into exothermic and endothermic reactions-

Reaction between carbon and oxygen.

Q. Which of the following are true about carbon dioxide?

1. Its odourless
2. Its colourless
3. Its acidic
4. Its insoluble in water

Q.

Classify chemical reactions on the basis of energy change that takes place during a reaction.

Q.

If water is made from hydrogen and oxygen molecules then how can dry ice be made of carbon dioxide? What actually is dry ice?

Q. Write the name of flame used in charcoal formation

Q.

If heat is evolved during a reaction, it is _______

Q.

Dry ice is the solid form of water.

1. True
2. False

Q.

At what temperature is dry ice formed.

1. $-183°\mathrm{C}$

2. $-18.3°\mathrm{C}$

3. $-78°\mathrm{F}$

4. $-78°\mathrm{C}$

Q. Carbon is found in its native state in all the given compounds except .

1. diamond
2. carbon dioxide
3. coal

Q. Which of the following gases cause the harmful green house effect?

1. Hydrogen
2. Oxygen
3. Carbondioxide
4. Nitrogen

Q.

What is the difference between an exothermic reaction and an endothermic reaction?

Q.

Name the acids formed when following gases are dissolved in water :

Sulphur dioxide($\mathit{S}{\mathit{O}}_{\mathbf{2}}$).

Q. At temperatures and pressures above the critical point, carbon dioxide behaves as a:

1. Semiconductor
2. Dry ice
3. $CO$
4. Supercritical $C{O}_2$

Q. Carbon dioxide exists in Earth's atmosphere as a:

1. Solid
2. Trace gas
3. Abundant gas
4. Metal

Q. Solid carbon dioxide is also known as:

1. ice
2. dry ice
3. compressed ice
4. None of the above

Q. In which state is Flame?

Q. Carbon dioxide allows the earth to radiate out heat rapidly.

1. True
2. False

Q. Carbondioxide is ____________ in water.

1. Soluble
2. Insoluble
3. Both A and B depending on the place from where $C{O}_2$ is taken.
4. None of these

Q.

1. True
2. False

Q. The density of carbon dioxide is around:

1. $2.98kg/m^3$
2. $1.98kg/m^3$
3. $5.0kg/m^3$
4. $10.0kg/m^3$

Q.

Which of the following statements regarding carbon dioxide are true?

1. Formed by incomplete combustion of hydrocarbons

2. Forms acidic aqueous solution

3. Obtained by the reaction between carbonates and acids

4. Used as a reducing agent in the metallurgy

Q.

Answer the following.

Name two causes of global warming.

Q. Conversion of a substance from its gaseous to solid state requires low temperature and high pressure.

1. True
2. False

Q. Expose a cool drink bottle which is open to the atmosphere for some time. The taste of cool drink changes. Why?

Q. Carbon dioxide is a _______, _________ and ____________ molecule.

1. colourless, toxic, non-linear
2. colourless, odourless, linear
3. colorful, odourless, linear
4. colourless, odorless, nonlinear

Q. Dry ice on heating converts into:

1. gas
2. do not convert
3. none of the above
4. liquid

Q.

Structural units of ice and dry ice are, respectively.

1. 

2. 

3. 

4.