Liquefaction

Q.

The rate of diffusion of methane at a given temperature is twice that of a gas Z. What is the molecular weight of Z.?

Q.

Which gas is filled in an Aeroplane tyre?

Q.

What is the critical temperature of carbon dioxide?

Q.

Which of the following is/are colourless and odourless gases?

1. $N{H}_3$

2. $O_2$

3. $N_2$

4. $N{O}_2$

Q.

Liquid nitrogen is used as a commercial refrigerant to flash freeze foods. Nitrogen boils at $-{196}^0\mathrm{C}$. What is this temperature on the Kelvin scale?

Q. Is gas have highest kinetic energy ?

Q.

The common name of solid carbon dioxide.

Q.

Discuss the effect of pressure on solubility of gases in liquid? When we open the cap of a cola drink (or any carbonated beverage), why does gas bubbles come out? [3 MARKS]

Q.

How will you justify that ice water and steam are not different methods for different state of matter explain

Q.

a) Bromine particles are almost twice as chlorine particle.

Which has diffuses faster? Bromine or chlorine? Reason it out.

Q.

The pressure of gas molecules is due to ________?

Q.

The solubility curve is a graph between solubility of a __________ in a solvent against changing __________ .

1. Gas ; Temperature

2. Solid ; Temperature

3. Gas ; Pressure

4. Solid ; Pressure

Q. 1Q-How solubility of gases in liquids increases on decreasing the temperature?
2Q-
How solubility of gases in liquids increases on increasing pressure?

Q.

Q.

What condition of temperature and pressure favors the liquefaction of gases?

Q.

A gas fills the vessel completely, in which it is kept. Why? [2MARKS].

Q.

Based on physical properties matter can be classified as………., ………and………..

Q.

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends, she got confused. Help her to identify the correct set of conditions

1. Low temperature, low pressure

2. High temperature, low pressure

3. Low temperature, high pressure

4. High temperature, high pressure

Q.

Ammonia and HCL are being preapred in two corners of a laboratry. Which gas will be deleated first by a student working in the middle of the laboratory? Explain

Q.

Define: Condensation

Q. The ratio of mass of carbon to hydrogen in methane (CH₄) is:​

Q.

Why in the manufacturing of soda, is carbon dioxide not dissolved at ordinary atmospheric pressure?

Q. Which of the following conditions is favourable for liquefaction of gas?

1. $T>T_c;P>P_c$
2. $T<T_c;P>P_c$
3. $T=T_c;P<P_c$
4. $T=T_c;P=P_c$

Q. Assertion :$S{O}_2$ gases is easily liquefied while $H_2$ is not. Reason: $S{O}_2$ has low critical temperature while $H_2$ has high critical temperature.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. A gas can be easily liquefied.

1. when its inversion temperature equals the Boyle's temperature
2. under reversible adiabatic expansion
3. under pressure and above critical temperature
4. at low pressure and above critical temperature

Q. Boyle's temperature of four gases are given below:

Gases	$A$	$B$	$C$	$D$
$T_B$	$120K$	$25K$	$500K$	$410K$

which gas can be liquefied most easily?

1. $A$
2. $B$
3. $C$
4. $D$

Q. An ideal Gas at 1 bar is heated from $0^{\circ }C$ to $373K$, keeping the pressure constant. If its initial volume is 5.46L, the final volume would be

1. 7.46L

2. 1.865L

3. 5.46L

4. 6L

Q. The value of van der Waals constant '$a$' for gases $O_2,N_2,N{H}_3$ and $C{H}_4$ are 1.360, 1.390, 4.170 and 2.253 litre${}^2$ atm mol${}^{-2}$ respectively. The gas which can most easily be liquefied, is:

1. $O_2$
2. $N_2$
3. $N{H}_3$
4. $C{H}_4$

Q. What are the most favourable conditions to liquefy a gas?

1. High temperature and high pressure
2. Low temperature and low pressure
3. Low temperature and high pressure
4. High temperature and low pressure

Q. Which gas can be easily liquified?
given 'a' for $N{H}_3=4.17,C{O}_2=3.59,S{O}_2=6.71,C{l}_2=6.49$

1. $S{O}_2$
2. $C{l}_2$
3. $N{H}_3$
4. $C{O}_2$