The pressure of 1 gm of an ideal gas A at 27 °C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature, the pressure becomes 3 bar.
The correct relationship between their molecular masses is -
1. MA=MB
2. 4MA=MB
3. MA= 2MB
4. 2MA=MB
A =
The SI unit for the quantity A is -
1.
2.
3.
4.
Assertion (A) | Critical temperatures for carbon dioxide and methane are 31.1 °C and –81.9 °C respectively. |
Reason (R) | The intermolecular forces of attraction are stronger in CO2 than CH4 |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
At 0°C, the density of a certain oxide of a gas at 2 bar is the same as that of dinitrogen at 5 bar.
The molecular mass of the oxide would be -
1. 35 g/mol
2. 45 g/mol
3. 70 g/mol
4. 60 g/mol
The volume of H2 that would be released when 0.15 g of aluminium reacts at 20 °C and 1 bar pressure with caustic soda is-
1. 225 L
2. 301 mL
3. 156 L
4. 203 mL
The pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 dm3 flask at 27 °C would be -
0.5 L of H2 at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at 27°C.
The pressure inside the vessel would be -
1. 3.6 bar
2. 1.8 bar
3. 4.1 bar
4. 0.7 bar
A student forgot to add the reaction mixture to the round-bottomed flask at 27 °C but instead, he placed the flask on the flame. After a lapse of time, he realized his mistake and using a pyrometer he found the temperature of the flask was 477 °C. The fraction of air that would expel out would be :
1. 1/3
2. 4/5
3. 3/5
4. 2/3
The total pressure of a mixture that contains 8 g of O2 and 4 g of H2 confined in a vessel of 1 dm3 at 27°C would be -
(R = 0.083 bar dm3 K-1mol-1)
1. 45.67 bar
2. 56.02 bar
3. 34.67 bar
4. 67.13 bar
Find the mass of payload of a balloon of radius 10 m, if a mass of 100 kg is filled with helium at 1.66 bar and 27°C temperature.
(Density of air = 1.2 kg m–3 and R = 0.083 bar dm3 K–1 mol–1).
1. 2905 Kg
2. 3811 Kg
3. 2721 Kg
4. 4201 Kg