Carbon Dioxide

Q.

Give a reason for the following observation.

Naphthalene balls disappear with time without leaving any solid.

Q. What is a solvay process describe its various reactions

Q. $C{O}_2$ is used for extinguishing fire because

1. it has a relatively high critical temperature
2. in solid state, it is called dry ice
3. it is neither combustible nor a supporter of combustion
4. it is a colourless gas

Q.

What is dry ice? Why it is called so?

Q. Given below are two statements :

Statement-I : For $KI$, molar conductivity increases steeply with dilution.

Statement-II : For carbonic acid, molar conductivity increases slowly with dilution. In the light of the above statements, choose the correct answer from the options given below :

Q.

Why E₂O₃ is more acidic than E₂O₅(group 15)

Q. Carbon dioxide is soluble in water, in which it reversibly forms:

1. carbic acid
2. carbonic acid
3. carbon dioxide
4. carbon dioxide is insoluble in water

Q. Which of the following is not true about structure of carbon dioxide?

1. In $C{O}_2$, carbon is sp-hybridised
2. It is a polar molecule
3. C forms two sigma bonds one with each oxygen atom and two $p\pi -p\pi$ bonds
4. $C{O}_2$ is a linear covalent compound

Q.

What is the difference between the greenhouse effect and global warming?

Q.

During ______, at a temperature of about $3000°\mathrm{C}$, Nitrogen combines with Oxygen to form Nitric oxide.

1. Combustion

2. Burning

3. Oxidation

4. Lighting

Q.

What factor does decide the acidic or basic nature of the oxide of an element?

Q.

Why are oxygen and nitrogen not called greenhouse gases?

Q.

How is excessive content of $C{O}_2$ responsible for global warming?

Q. Which of the following are the poisonous gases?

1. All of the above
2. Mustard gas
3. Tear gas
4. Phosgene gas

Q.

Distinguish between the following pairs of compound using the test given within brackets:

1. Manganese dioxide and copper (II) oxide (using concentrated HCl)

Q. Complete combustion of methane gives

1. Only $C{O}_2$
2. $C{O}_2$ and $CO$
3. $CO,C{O}_2$ and $H_{2}O$
4. $C{O}_2\text{and}{H}_{2}O$

Q.

Carbon dioxide dissolve in water to form a weak acid called_________________.

Q. The set in which componds have different nature is :

1. $NaOH$ and $Ca(OH{)}_2$
2. $Be(OH{)}_2$ and $Al(OH{)}_3$
3. $B(OH{)}_3$ and $H_{3}P{O}_3$
4. $B(OH{)}_3$ and $Al(OH{)}_3$

Q. The pressure of real gases is less than that of ideal gas because of

1. Intermolecular attraction
2. Finite size of particles
3. Increase in the kinetic energy of the molecules
4. Increase in the number of collisions

Q.

What type of bond is joining the two hydrogens?

Q.

8. What is dry ice? How is it used?

Q. Identify the gas evolved when :
(ii) Concentrated hydrochloric acid is made to react with manganese dioxide

Q. $H_{2}S{O}_4$ is not used for preparation of $C{O}_2$ from marble chips because

1. it does not react
2. huge amount of heat is evolved
3. the reaction is vigorous
4. calcium sulphate is sparingly soluble and gets deposited on marble chips and stops the reaction.

Q. which is the product obtained when silica dissolves in excess of HF
a) SiF4
b)H2SiF4
c)siF6
d) H2SiF6

Q.

What is the chemical name of dry ice? Why is it called dry ice ?

Q. Which of the following reactions produce(s) carbon dioxide?

1. Complete combustion of carbon
2. Decomposition of $CaC{O}_3$
3. Fermentation of glucose
4. Action of hydrochloric acid on lime stone

Q. Carbon dioxide is soluble in water, in which it reversibly forms:

1. carbic acid
2. carbonic acid
3. carbon dioxide
4. carbon dioxide is insoluble in water

Q.

Write a chemical reaction to affect the following transformation: $3-$ Nitrobromobenzene to $3-$ Nitrobenzoic Acid

Q.

What happens when ${\mathrm{CO}}_2$ is passed through lime water for short duration?

Q.

When two or more refrigerants are mixed?