Carbon Dioxide

Q.

$C{O}_2$ dissolves in water to form carbonic acids.

1. True
2. False

Q.

Which compound of carbon can be used as a fuel?

1. Carbon monoxide

2. Carbon dioxide

3. Calcium carbonate

4. Sodium carbonate

Q.

Give two important properties of carbon dioxide.

Q. Assertion (A): Aluminium acts as a reducing agent in thermite process.
Reason (R): Highly reactive metals such as Na, Ca, Al, etc., can be used as reducing agents to displace metals of lower reactivity from their compound​.

1. Both A and R are true, but R is not the correct explanation of A
2. Both A and R are true, and R is the correct explanation of A
3. A is true but R is false
4. Both A and R are false

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. Basic nature of oxides of group13 element increases down the group

Q.

26. ________ is used in advertisement glow tubes.

1. neon

2. helium

3. argon

4. nitrogen

Q. In the reaction: $CaC{O}_3+H_{2}O+C{O}_2\to Ca(HC{O}_3{)}_2$
calcium carbonate is insoluble while calcium bicarbonate is soluble in water.

1. True
2. False

Q.

Complete the following reaction:

${\text{Na}}_2{\text{CO}}_3\text{(s)}+{\text{H}}_2{\text{SO}}_4\text{(aq)}\to ?$

1. ${\text{Na}}_2{\text{CO}}_3+{\text{H}}_2\text{O}+{\text{CO}}_2$
2. ${\text{Na}}_2{\text{SO}}_4+{\text{H}}_2\text{O}$
3. ${\text{Na}}_2{\text{SO}}_4+{\text{CO}}_2$
4. ${\text{Na}}_2{\text{SO}}_4+{\text{H}}_2\text{O}+{\text{CO}}_2$

Q. What happens during saponification of oil in kettle process? (1 mark)

Q. Dry ice is:

1. solid $S{O}_2$
2. solid $N{O}_2$
3. solid $C{O}_2$
4. solid $H_{2}O$

Q. In a manufacturing unit of hydrochloric acid situated near a lake, an accident occurs resulting in spillage and leakage of the storage tanks containing hydrochloric acid. The spillage spreads all over an iron structure and also into the lake. The specialists are called for an inspection, who observe fizzing on the surface of the iron structure.

iii) The specialists took a sample of water from the lake. Which of the following can be used to neutralise its acidity?

1. Formic acid
2. Acetic acid
3. Limewater
4. Sodium chloride

Q.

Complete the following reaction:

${\text{Na}}_2{\text{CO}}_3\text{(s)}+{\text{H}}_2{\text{SO}}_4\text{(aq)}\to ?$

1. ${\text{Na}}_2{\text{CO}}_3+{\text{H}}_2\text{O}+{\text{CO}}_2$
2. ${\text{Na}}_2{\text{SO}}_4+{\text{H}}_2\text{O}$
3. ${\text{Na}}_2{\text{SO}}_4+{\text{CO}}_2$
4. ${\text{Na}}_2{\text{SO}}_4+{\text{H}}_2\text{O}+{\text{CO}}_2$

Q. Compound A reacts with aqueous hydrochloric acid to release a greenish yellow gas B with choking pungent smell. Choose the option correctly depicting the compound A and gas B.​

1. A :$Mn{O}_2$ , B: $O_2$
2. A: $MnC{l}_2$, B: $O_2$
3. A: $MnC{l}_2$, B: $C{l}_2$
4. A : $Mn{O}_2$ , B: $C{l}_2$

Q. carbon and hydrogen are used as reducing agents .why?

Q. _________releases a gas with the addition of dilute acid.

1. $N_2$
2. $KI$
3. $CC{l}_4$
4. $AgN{O}_3$
5. $CaC{O}_3$