MCQ on gas laws
Both refer to the behaviour of gases Boyle's Law tells us that for an ideal gas, at a constant temperature, volume is proportional to pressure. So doubling the volume, halves the pressure, providing temperature is kept the same. Charles' Law tells us that for an ideal gas, at constant pressure, volume is proportional to temperature (where temperature is in degrees Kelvin). Thus doubling the. Is there a simple and straightforward way to derive the ideal gas law and gas constant from the 'combination' of Boyle's, Charles', and Avogadro's laws? Or is the process actually quite involved, and for that reason most general chemistry texts (i.e. All that I have seen, including physical chemistry texts) avoid providing the 'derivation'? Boyle showed that the volume of a sample of a gas is inversely proportional to its pressure (Boyle’s law), Charles and Gay-Lussac demonstrated that the volume of a gas is directly proportional to its temperature (in kelvins) at constant pressure (Charles’s law), and Avogadro postulated that the volume of a gas is directly proportional to the number of moles of gas present (Avogadro’s law). The tree laws (Boyle’s law, Charles law and Avogardo’s law) can be combined together in a single equationn which is known as ideal gas equation. Gas law Boyle’s Law (pressure-voulme relationship) According to this law, at constant temperature, pressure of a fixed amount of gas varies inversely with its volume, i.e.
MCQ General Knowledge on Behavior of Gas Boyle’s Law, Charles’s Law Avogadro’s Law Objective short Questions and Answers for class 9 10 and aspirants who are preparing for competitive govt job examinations like SSC, CGL, MTS, IAS, UPSC, Railway, Banking, Defence, Police CDS, etc.
[MCQ.1] The constant quantity of Boyle’s Law is
A: Only mass of the gas
B: Only temperature of a gas
C: Mass and Pressure of a gas
D: Mass and temperature of a gas
Answer
D: Mass and temperature of a gas.
[MCQ.2] Let the pressure P and volume V for a certain gas. If the pressure is increased by 25% at a constant temperature, then what would be the volume of the gas?
A: 0.6V
B: 0.75V
C: 0.8V
D: 0.85V
Answer
0.8V Xeron nb driver download for windows.
[MCQ.3] What is the nature of the pressure-volume (P-V) graph in Boyle’s Law?
A: Straight Line;
B: Circle:
C: Elliptical;
D: Rectangular Hyperbola:
Answer
Rectangular Hyperbola.
[MCQ.4] What is the nature of the pressure-volume vs Pressure (PV vs P) graph in Boyle’s Law?
A: Straight Line parallel to P axis;
B: Straight line parallel to PV axis:
C: Elliptical;
D: Hyperbola:
Answer:
Straight-line parallel to the P axis.
[MCQ.5] The unit of pressure in the SI system is-
A: N
B: N-m
C: N-m2
D: N/m2
Answer:
N/m2
[MCQ.6] 1 m3 = ______ cm3
A: 100
B: 103
C:105
D: 106
Answer
D: 106
[MCQ.7] If the pressure of a certain amount of gas is reduced to 1/4th of its initial pressure at a fixed temperature, then what would be its final volume?
A: 2 times
B: 3 times
C: 4 times
D: 6 times
Answer
C: 4 times
[MCQ.8] If the pressure is increased by 2 times of a certain amount of gas at a fixed temperature, then what would be its final volume?
A: Double
B: One half
C: Tripple
D: One fourth
Answer
B: One half
[MCQ.9] Suppose, at for a gas having constant mass the volume is V0 at temperature 0 oC. What would be its final volume at 100 oC if the pressure remains constant?
A: (293/273)V0
B:(283/273)V0
C: (303/273)V0
D: (373/273)V0
Answer
(303/273)V0
[MCQ.10] For a given mass of an ideal gas at constant pressure, the graph V – t (t in Celcius scale), intersect the temperature axis at –
A: – 273 oC
B: 0 oC
C: 273 oC
D: Do not intersect.
Answer
A: – 273 oC
[MCQ.11] In which scale of temperature, the temperature can not be negative?
A: Celcius Scale
B: Fernheight Scale
C: Absolute Scale
D: All of the above
Answer
C: Absolute Scale
[MCQ.12] The Freezing point of water in absolute scale is-
A: 0 K
B: 273 K
C: 212 K
D: None of the above;
Answer
B: 273 K
[MCQ.13] If the temperature is increased from 0 oC to 30 oC at a constant pressure of gas having fixed mass, then the ratio of initial and final volume will be –
A: 91 : 101
B: 91 : 100
C: 91 : 111
D: 91 : 121
Answer
A: 91 : 101
[MCQ.14] The constant quantity(s) in Charle’s Law is (are)-
A: Temperature
B: Volume
C: Pressure and Mass of gas
D: Temperature and Mass of gas
Answer
Pressure and Mass of a gas.
[MCQ.15] The nature of the V-t (t in Celsius scale) graph in Charle’s law is-
A: Straight line
B: Circle
C: Parabola
D: Hyperbola
Answer
Straight line
[MCQ.16] At which temperature the volume of gas reduces to Zero?
A: 0 K
B: 0 oC
C: 273 oC
D: 273 K
Answer
A: 0 K
[MCQ.17] Which Scientist discovered the absolute scale of temperature?
A: Charles
B: Boyle
C: Kelvin
D: Gay-Lussac.
Answer
Kelvin
[MCQ.18] At which temperature the real gas behaves as an ideal gas?
A: At high pressure and low temperature;
B: At low-pressure and high temperature;
C: At low pressure and low temperature;
D: AT high pressure and high temperature;
Answer
B: At high temperature and low pressure;
[MCQ.19] The molar mass of water is –
A: 16 g
B: 20 g
C: 18 g
D: 44 g
Answer
C: 18 g
[MCQ.20] The mass of 5 mol of Hydrogen gas is-
A: 5 g
B: 10 g
C: 18 g
D: 27 g
Answer
B: 10 g
[MCQ.21] In the case of collision of two gas molecule of an ideal gas –
A: The linear momentum is conserved only;
B: The kinetic energy is conserved only;
C: Linear momentum and kinetic energy both conserve;
D: Linear momentum and kinetic energy both are not conserved;
Answer
C: Linear momentum and kinetic energy both are conserved.
[MCQ.22] The energy of the molecules of an ideal gas is –
A: Only potential energy;
B: Only kinetic energy;
C: Kinetic energy + potential energy;
D: Kinetic energy – potential energy;
Answer
B: Only kinetic energy;
[MCQ.23] Which is the Ideal Gas Equation from the following?
A: PV = mc2;
B: PV = mgh;
C: PV = nRT;
D: PV = mSt;
Answer
C: PV = nRT;
[MCQ.24] Which is the constant quantity in Ideal Gas Equation?
A: Pressure P
B: Volume V
C: R
D: Temperature
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Answer
C: R
[MCQ.25] The value of Universal Gas Constant in CGS unit is –
A: 8.31 * 106
B: 8.31 * 107
C: 8.31 * 108
D: 8.31 * 109
Answer
B: B: 8.31 * 107
[MCQ.26] The dimension of the universal gas constant is –
A: M L2 T-1 N-1
B: M L-1 T-1 N-2K-1
C: M L2 T-1 N-2 K
D: M L-1 T-2 N-1 K-1
Answer
D: M L-1 T-2 N-1 K-1
[MCQ.27] According to the kinetic theory of gas, at which temperature the kinetic energy of a molecule of an ideal gas becomes zero?
A: — 273 oC
B: 0 oC
C: – 100 oC
D: 273 K
Answer
A: — 273 oC
[MCQ.28] 84 g of N2 = ______ g N2.
A: 1 g
B: 2 g
C: 3 g
D: 4 g
Answer
C: 3 g
[MCQ.29] Which of the following has the largest volume?
2 g of Hydrogen Gas, 28 g of Nitrogen Gas, 44 g of CO2 gas.
A: 2 g of Hydrogen Gas
B: 28 g of Nitrogen Gas
C: 44 g of CO2 gas
D: All gasses have the same volume.
Answer
D: All the gas has the same volume.
[MCQ.30] How many atoms are there in 1 mol of CO2 gas if the Avogadro number in N?
A: N
B: 2N
C: 3N
D: 4N
Answer
C: 3N
[MCQ.31] If the mass of 11.2 L of CO2 is 22g, then what is its atomic mass?
A: 22
B: 44:
C: 88
D: 11
Answer
B: 44
[MCQ.32] The mass of an O2 molecule is –
Paint software for mac. A: 5.31 * 10-23g
B: 10.62 * 10-23
C: 15.93 * 10-23
D: 2.65 * 10-23
Answer
5.31 * 10-23g
[MCQ.33] The number of molecules of 7g of N2 gas is-
A: 22.044 * 1023
B: 1.506 * 1023
C: 3.011 * 1023
D: 6.022 * 1023
Answer
1.506 * 1023
[MCQ.34] The volume of 2.2 g CO2 at 27 oC and 570 mm pressure is –
A: 4.83 L
B: 0.82 L
C: 3.82 L
D: 1.64 L
Boyle's And Charles Law Problems
Answer
D: 1.64 L
[MCQ.35] At which condition the real gas deviated from the ideal gas?
A: At low temperature and low pressure
B: At Low pressure and high temperature;
C: At high pressure and low temperature;
D: At high pressure and high temperature;
Answer
At low temperature and high pressure.
[MCQ.36] The state of the equation for 7g of Oxygen gas is _
A: PV = 7RT
B: PV = (32/7)RT
C: PV = (7/32)RT
D: PV = 32RT
Answer
C: PV = (7/32)RT
[MCQ.37]If the pressure of a certain amount of gas is increased at a constant temperature, the density of the gas is –
A: Remain Constant;
B: Decreased;
C: Increased;
D: Can not be determined;
Answer
Increased
[MCQ.38] What would be the volume of 22g of Carbon dioxide at STP?
A: 11.2 L
B: 1.12 L
C: 22.4 L
D: 2.24 L
Answer
11.2 L
[MCQ.39] The molar volume of any gas at STP is –
A: 22.4 L
B: 2.24 L
C: 44 L
D: 24.2 L
Answer
22.4 L
Download MCQ of Gas Laws – Boyle’s Law, Charles’s Law Avogadro’s Law
P1V1=P2V2 , V= k/P
This equations were derived from Boyle's experiments, in which he observed the behaviors of gases. What he confirmed was that pressure can be affected by volume, and when pressure increases, volume decreases, and vice versa. Boyle's law is only approximately true for real gases.
Ex. P1V1=P2V2
Boyle's And Charles Law Worksheet
P1= 6.5 x 103 atm, V1= 1.34 L, P2= 5.1 x 104, V2= ?
V2= (P1 x V2)/ P2
V2= (6.5 x 103 atm x 1.34 L)/ (5.1 x 104 atm) = .17 L
Charles's LawCharles found that the volume of a gas at constant pressure increases linearly with the temperature of the gas. The equation derived from this is V1/T1 = V2/T2 and means that the volume is directly proportional to to temperature.
Ex. V1/T1=V2/T2
T1= 298 K, V1= 2.85 L, T2= 315, V2= ?
Avogadro's Law Examples
V2= (T2/T1)x V1
V2= (315 K/ 298 K) x (2.85 L) = 3.01 L
Boyle Charles Avogadro Law Formula
Avogadro's LawAvogadro postulated that equal columes of gases at the same tempurature and pressure contain the same number of particles. The equation used is V = an. V is volume, n is number of moles of gas particles, and a is a constant. It can also be derived to: V1/n1=V2/n
2.