Chemistry - States Matter - Quiz-5

Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H₂: O₂ : CH₄ would be-

0%

8:16:1
0%

16:8:1
0%

16:1:2
0%

8:1:2

Maximum deviation from ideal gas is shown by-

0%

H_2(g)
0%

N_2(g)
0%

CH_4(g)
0%

NH_3(g)

With 100% increase in temperature, the average velocity of a gaseous molecule increases by -

0%

2.8 times
0%

4.0 times
0%

1.4 times
0%

2.0 times

What volume of oxygen gas (O₂) measured at 0°C and 1 atm, is needed to burn completely 1 L of propane gas (C₃H₈) measured under the same conditions?

0%

7L
0%

6L
0%

5L
0%

10L

The kinetic energy in kcal of 80 gms of methane gas at 227°C is

0%

15
0%

2.5
0%

25
0%

7.5

The ratio, $\frac{rms velocity of {SO}_{2}}{rms velocity of He}$ , of sulphur dioxide and helium gases at 30ºC is equal to

0%

() 4
0%

() 0.25
0%

() 0.10
0%

() 8

The average kinetic energy of two moles of ${CO}_{2}$ at a certain temperature is 1800 cal. The temperature of the gas is $-$

0%

() 300 K
0%

() 150 K
0%

() 200 K
0%

() 400 K

For a real gas, PV is a constant over a small range of pressures at-

0%

Boyle’s temperature
0%

Critical temperature
0%

Inversion temperature
0%

Ordinary temperature

A vessel of volume $0.02 m^{3}$ contains a mixture of hydrogen and helium at 20°C and 2 atm pressure. The mass of the mixture is 5 g. The ratio of the mass of hydrogen to that of helium in the mixture, is -

0%

1:2
0%

1:3
0%

2:3
0%

3:2

Four particles have velocities 1, 0, 2, 3 m/s. The root mean square of the particles is (in m/s)

0%

() $3.5$
0%

() $\sqrt{3.5}$
0%

() $1.5$
0%

() $\sqrt{14 / 3}$

Joule-Thomson expansion of an ideal gas is an

0%

Isothermal process
0%

Isobaric process
0%

Isoenthalpic process
0%

Ideal process

The pressure-volume plot for an ideal gas at a given temperature has the form of a -

0%

Straight line
0%

Exponential curve
0%

Rectangular hyperbola
0%

U-shaped curve

The average, RMS and most probable velocities of gas molecules at STP increase in the order

0%

RMS < average velocity < most probable velocity
0%

Most probable velocity < average velocity < RMS
0%

Average velocity < RMS < most probable velocity
0%

RMS < most probable velocity < average velocity

Equal volumes of ${SO}_{2}$ and $He$ at a temperature T and pressure P are allowed to effuse through a hole. The rate of effusion of helium is

0%

Equal to the rate of effusion of ${SO}_{2}$
0%

Four times the rate of effusion of ${SO}_{2}$
0%

Half of the rate of effusion of ${SO}_{2}$
0%

Twice the rate of effusion of ${SO}_{2}$

Flask X is filled with 20 g of ${CH}_{4}$ gas at 100 °C and another identical flask Y with 40 g $O_{2}$ gas at the same temperature. The correct statement among the following is –

0%

The pressure of the gases in the two flasks is identical
0%

The pressure of ${CH}_{4}$ in flask X is higher than that of $O_{2}$ in flask Y
0%

The pressure of ${CH}_{4}$ in flask X is lower than that of $O_{2}$ in flask Y
0%

The pressure of ${CH}_{4}$ in flask X is half that of $O_{2}$ in flask Y

A certain volume of argon gas (Mol. wt. = 40) requires 45 s to effuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight requires 60s to pass through the same hole under the same conditions of temperature and pressure. The molecular weight of the gas is

0%

53
0%

35
0%

71
0%

120

The temperature of a sample of gas is raised from 127ºC to 527ºC. The average kinetic energy of the gas $-$

0%

Does not changes
0%

Is doubled
0%

Is halved
0%

Cannot be calculated

A helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is

0%

Two times that of hydrogen molecules
0%

Same as that of hydrogen molecules
0%

Four times that of hydrogen molecules
0%

Half that of hydrogen molecules

The rms speed of a gas molecules at temperature $27 K$ and pressure $1.5$ bar is $1 \times 10^{4}$ cm/sec. If both temperature and pressure are raised three time, the rms speed of the gas will be

0%

() $9 \times 10^{4}$ cm/sec
0%

() $3 \times 10^{4}$ cm/sec
0%

() $\sqrt{3} \times 10^{4}$ cm/sec
0%

() $1 \times 10^{4}$ cm/sec

The rate of effusion of helium gas at a pressure of 1000 torr is 10 torr min–1 What will be the rate of effusion of hydrogen gas at a pressure of 2000 torr at the same temperature?

0%

() $20 torr \min^{- 1}$
0%

() $40 torr \min^{- 1}$
0%

() $20 \sqrt{2} torr \min^{- 1}$
0%

() $10 torr \min^{- 1}$

The van der waals' constants for a gas are : $a = 4 {lit}^{2} atm {mol}^{- 2}, b = 0.04 lit {mol}^{- 1}$ . lts Boyle temperature is roughly

0%

$100^{0} C$
0%

$1220 K$
0%

$1220^{0} C$
0%

$1600 K$

Choose the correct statement for viscosity ( $η$ ) variation with T and P for an ideal gas-

0%

$η$ of a gas increases with increase in temperature (T), but it is independent of pressure
0%

$η$ of a gas decreases with increase in T and increases with increase in P
0%

$η$ of a gas is independent of temperature and pressure
0%

$η$ of a gas increases with increase in both T and P

Since the atomic weights of C, N and O are 12, 14 and 16 respectively, among the following pair, the pair that will diffuse at the same rate is $-$

0%

Carbon dioxide and nitrous oxide
0%

Carbon dioxide and nitrogen peroxide
0%

Carbon dioxide and carbon monoxide
0%

Nitrous oxide and nitrogen peroxide

Oxygen is present in 1-litre flask at a pressure of $7.6 \times 10^{- 10}$ mmHg.The number of oxygen molecules in the flask at $0 º C$ is -

0%

$2.686 \times 10^{10}$
0%

$26.86 \times 10^{10}$
0%

$0.626 \times 10^{12}$
0%

$4.123 \times 10^{8}$

The critical temperature and critical pressure of a gas obeying van der Waals’ equation are 30ºC and 73 atm respectively. Its van der Waals’ constant, b $(in litres {mol}^{- 1})$ is, therefore

0%

0.500
0%

0.060
0%

0.265
0%

0.043

A closed vessel contains equal number of oxygen and hydrogen molecules. Consider the following statements:

1. The average speed of hydrogen molecules is greater.

2. The two gases have different average energies.

Wrong statements are –

(A) 1 and 2

(B) 2 and 3

0%

(C) 1 nd 3
0%

(D) 2 and 4
0%

3. Hydrogen moleules strike the walls more often.
0%

4. Weight of hyrogen is $\frac{1}{8}$ th of the weight of oxygen.

A sealed container contains 0.5 mol of ${SO}_{3}$ gas at 100°C and 2 atm pressure. What would be the pressure in the container if the ${SO}_{3}$ gas is decomposed completely according to the above equation and the temperature were maintained at 100°C –

${SO}_{3}$ (g) decomposes according to the equation

$2 {SO}_{3} (g) \overset{}{\to} 2 {SO}_{2} (g) + O_{2} (g)$

0%

(A) 0.5 tm
0%

(B) 1.0 atm
0%

(C) 2.0 atm
0%

(D) 3.0 atm

A general form of equation of state for gases is PV=RT $(A + \frac{B}{V} + \frac{C}{V^{2}} + . . . . . . . .),$ where V is the molar volume of the gas and A, B, C, ........... are constant for the gas. The values of A and B, if the gas obeys van der Waals' equation, are respectively.

0%

$\frac{a}{RT}, b$
0%

$\frac{2 a}{RT}, b$
0%

$1, b - \frac{a}{RT}$
0%

$1, \frac{a}{27 b}$

The mean free path of gas A, with molecular diameter equal to 4 Å, contained in a vessel, at a pressure of $10^{- 6}$ torr, is 6990 cm. The vessel is evacuated and then filled with gas B, with molecular diameter, equal to 2 Å, at a pressure of $10^{- 3}$ torr, the temperature remaining the same. The mean free path of gas B will be

0%

() 28 cm
0%

() 280 cm
0%

() 7 cm
0%

() 14 cm

Which of the following curves does not represent Boyle's Law

0%
0%

`
0%
0%

0:0:1

Practice Chemistry Quiz Questions and Answers

0:0:1

Practice Chemistry Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.