Carbon Dioxide

Q.

Why do${\mathrm{CaCO}}_3+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$ form $\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$?

Q.

Which gas is commonly used as a fire extinguisher?

1. Carbon monoxide

2. Carbon dioxide

3. Oxygen

4. Ozone

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

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

Q. Carbon dioxide is prepared in lab by the reaction of calcium carbonate $\left({\mathrm{CaCO}}_3\right)$ with.

1. ${\mathrm{NH}}_3$
2. $\mathrm{dil}.\mathrm{HCl}$
3. $\mathrm{NaOH}$

Q.

On addition of conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$to a chloride salt, colorless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

1. ${\mathrm{H}}_2{\mathrm{SO}}_4$ reduces $\mathrm{HI}$to ${\mathrm{I}}_2$

2. $\mathrm{HI}$ is of violet color

3. $\mathrm{HI}$ gets oxidized to ${\mathrm{I}}_2$

4. $\mathrm{HI}$ changes to ${\mathrm{HIO}}_3$

Q. The conversion of dry ice into carbon dioxide gas is due to , while the conversion of carbon dioxide gas into dry ice is due to .

1. sublimation
2. deposition
3. solidification
4. evaporation

Q.

Identify the Anion present in Compound Z which on reacting with dilute Sulphuric acid liberates a gas which turns lime water milky, but the gas has no effect on acidified Potassium dichromate solution?

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

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

Q.

The following statements regarding characteristic of carbon dioxide $\left(C{O}_2\right)$ are true except that it is:

1. It is lighter than air.

2. It is a colourless gas.

3. It is an odourless gas.

4. It does not support combustion.

Q. The process responsible for the given change:
Naphthalene balls disappear over time without leaving any solid residue behind.

a) Evaporation
b) Melting
c) Boiling
d) Sublimation
[1 Mark]

Q. 2 ml of HCl was taken in each of the three test tubes A, B and C to which 2 gm of limestone was added. The gas liberated from each of them were passed through limewater, water and hydrochloric acid respectively. Which of the test tube(s) will give a milky solution?

1. A
2. B
3. Both A and B
4. All three test tubes.

Q.

Name the following:
Salt used in the laboratory to prepare nitric acid.

Q.

Methane burns in air to form ${\mathrm{CO}}_2$ and ${\mathrm{H}}_2$.

1. True
2. False

Q.

The following statements regarding characteristic of carbon dioxide $\left(C{O}_2\right)$ are true except that it is:

1. a colourless gas

2. lighter than air

3. an odourless gas

4. not a supporter of combustion

Q. How can washing soda be obtained from baking soda? Discuss uses of washing soda.

Q.

The product formed during a direct combination reaction of carbon dioxide and water is

1. Iron

2. Carbonic acid

3. Hydrogen

4. Oxygen

5. Carbon monoxide

Q. How can washing soda be obtained from baking soda? Discuss uses of washing soda.

Q. On passing carbon dioxide through limewater, the lime water turns milky. This is due to the formation of.

1. ${\mathrm{CaCO}}_3$
2. $\mathrm{CaO}$
3. ${\mathrm{Na}}_2{\mathrm{CO}}_3$
4. ${\mathrm{Na}}_{2}O$

Q. Excessive use of certain Beverages has a harmful effect on human body ....with any 5 Beverages identify the harmful ingredient can that same ingredient be substituted with an organic or herbal component

Q.

Identify the correct order of acidic strength of $C{O}_2$, $CuO$, $CaO$, and $H_{2}O$:

1. $H_{2}O<CuO<CaO<C{O}_2$

2. $CaO<CuO<H_{2}O<C{O}_2$

3. $CaO<H_{2}O<CuO<C{O}_2$

4. $H_{2}O<C{O}_2<CaO<CuO$

Q. All the following statements are true about carbon dioxide except:

1. Its molecular formula is $C{O}_2$
2. Its molecular mass is 44 u
3. Dense than air
4. It always exists as gas

Q.

Which of the following is/are uses of $C{O}_2$?

1. As a fire extinguisher

2. In preparation of aerated water

3. In artificial respiration

4. To support combustion

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

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

Q. A mixture of camphor and $KCl$ can be separated by:

1. sublimation
2. decantation
3. filteration
4. evaporation

Q.

write two uses of carbon in daily life

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

Q.

State two uses of carbon dioxide gas.

Q.

Identify the correct order of acidic strength of $C{O}_2$, $CuO$, $CaO$, and $H_{2}O$:

1. $CaO<CuO<H_{2}O<C{O}_2$

2. $H_{2}O<CuO<CaO<C{O}_2$

3. $CaO<H_{2}O<CuO<C{O}_2$

4. $H_{2}O<C{O}_2<CaO<CuO$

Q.

Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which of the following 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. Lime water turns milky when exposed to air and stirred. This shows that air contains:

1. carbon dioxide
2. hydrogen
3. nitrogen
4. oxygen