CBSE
Multiple Choice QuestionsThe RMS velocity of CO gas molecules at 27°C is approximately 1000 m/s. For N2 molecules at 600 K, the RMS velocity is approximately
2000 m/s
1414 m/s
1000 m/s
1500 m/s
For one mole of an ideal gas,the slope of V vs T curve at constant pressure of 2 atm is X L mol-1 K-1.The value of the ideal universal gas constant 'R' in terms of X is
X L atm mol-1 K-1
L atm mol-1 K-1
2X L atm mol-1 K-1
2 X atm L-1 mol-1 K-1
Assertion : CHCl3 and CH3OH are miscible.
Reason : One of them is polar.
If both Assertion and Reason are true and Reason is the correct explanation of Assertion
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
If Assertion is true but Reason is false.
If Assertion is false but Reason is true.
Assertion: An increase in surface area increases the rate of evaporation.
Reason: Stronger the intermolecular attractive forces, fast is the rate of evaporation at a given temperature.
If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
The dispersed phase and dispersion medium of fog respectively are
solid, liquid
liquid, liquid
liquid, gas
gas, liquid
Assertion: Atoms can neither be created nor destroyed.
Reason: Under the similar condition of temperature and pressure, an equal volume of gases does not contain an equal number of atoms.
If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
The units of surface tension and viscosity of liquids respectively are
kg m-1s-1, Nm-1
kg s-2, kg m-1 s-1
Nm-1, kg m-1s-2
kg s-1, kg m-2s-1
Equal weights of CH3 and H2 are mixed in an empty container at 25°C. the fraction of the total pressure exerted by H2 is:
1/9
1/2
8/9
16/17
At a certain temperature the time required for the complete diffusion of 200-mL of H2 gas is 30 min. The time required for the complete diffusion of 50 mL of O2 gas at the same temperature will be
60 min
30 min
45 min
15 min
A gas can be liquefied at temperature T and pressure p provided
T = Tc and p < pc
T < Tc and p > pc
T > Tc and p > pc
T > Tc and p < pc
