Free Gases MCQs with Answers
443 Gases MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Gas behaviour is explained through the kinetic molecular theory and the relationships among pressure, volume and temperature. Work includes STP, Boyle's and Charles's laws, absolute zero, the ideal gas equation, and the distinction between ideal and real gases, especially the effects of intermolecular forces and molecular volume.
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443 questions · page 7 of 23
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The correct expression for Boyle's Law is:
Correct answer: Option B122. At constant temperature, when the pressure of gas is increased three times then its volume becomes:
- A. 2V/3
- B. 3V
- C. V/3
- D. 5V
Explanation: When the pressure of a gas is increased three times at constant temperature, according to Boyle's Law, the volume of the gas decreases to…
Correct answer: V/3- A. PV vs. P
- B. P vs. V
- C. P vs V-l
- D. PV vs. P-1
Explanation: As pressure and volume are inversaly proportional to each other.So,their plot will be a curved graph.
Correct answer: P vs. V- A. Parabola
- B. Hyperbola
- C. Straight line
- D. Circle
Explanation: At constant pressure (isobaric process), the graph between volume (V) and temperature (T) is typically a straight line.
Correct answer: Straight line- A. Boyle's law
- B. Isothermal process
- C. General gas law
- D. Charles law
- E. Henry's law
Explanation: Charles's law, or the law of volumes, was found in 1787 by Jacques Charles.
Correct answer: Charles law- A. 3.00 dm3
- B. 3.43 dm3
- C. 3.08 dm3
- D. 3.25 dm3
- E. 0.54 dm3
Explanation: V1=3.8 dm3 ; T1= 35 +273=308K V2=?; T2=5+273=278K V1/T1=V2/T2 3.8/308=V2/278 V2=3.43 dm3
Correct answer: 3.43 dm3127. Pressure remaining constant, at which temperature volume of gas will become twice the volume at 0oC?
- A. 546 oC
- B. 200 oC
- C. 546 K
- D. 273 K
Explanation: According to the general gas equation (PV=nRT), the volume of a gas is directly proportional to its temperature.
Correct answer: 546 K- A. 2.3 cm³
- B. 4 cm³
- C. 2 cm³
- D. 3.4 cm³
Explanation: According to Charles' law: V1 / T1 = V2 / T2 Where V = volume and T = temperature in Kelvins 1°C change in temperature = 1 K change 640 /…
Correct answer: 2.3 cm³- A. Zero Fahrenheit
- B. Zero Kelvin
- C. Absolute Fahrenheit
- D. All of these options are correct
Explanation: a new temperature scale called Kelvin scale is used for Charles law. This scale begins with 0 Kelvin (-273 degrees) so is also called zero…
Correct answer: Zero Kelvin- A. Pressure
- B. Temperature
- C. Volume
- D. Number of moles
Explanation: B is the correct option because In Charles's law volume occupied by the gas is directly proportional to the temperature.
Correct answer: Temperature- A. Contracts
- B. Expands
- C. Shrink
- D. Squeezed
Explanation: As temperature increases the volume of the gas also increases.
Correct answer: Expands- A. Pressure
- B. Temperature
- C. Number of moles
- D. All of these
Explanation: Option A is incorrect as greater pressure decreases the volume of a gas.
Correct answer: Number of moles- A. 1L
- B. 0.1L
- C. 1.05 L
- D. 1.50L
Explanation: This is the correct solution given below: P1 = 1 atm V1 = 0.5 L ( 0.5 dm3 ) T1 = 0o C ( 0 + 273 = 273 K) P2 = 1 atm T2 = 300o C ( 300 +…
Correct answer: 1.05 L- A. 3°C
- B. 819°C
- C. 819K
- D. 3K
Explanation: The volume of a gas at STP is 10 dm3. If the pressure is kept constant, the volume of the gas will increase as the temperature increases.
Correct answer: 819K- A. Increases
- B. Remains unchanged
- C. Decreases
- D. First increases then decreases
Explanation: On heating,the temperature of gas will increase.So,its volume will also increase as temperature is directly proportional to volume at…
Correct answer: Increases- A. H2
- B. N2
- C. CO2
- D. CI2
Explanation: It has nonpolar bonds between its component atoms. This results in a weaker attraction between a nucleus.
Correct answer: H2- A. Boyle's law
- B. Charles's law
- C. Avogadro's law
- D. Van der Waals
Explanation: Option D is correct since Van der Waals developed an explanation for the deviation of real gas from ideal gas and an equation that was…
Correct answer: Van der Waals- A. torr
- B. atm
- C. pounds per square inch
- D. Nm-2.
Explanation: Pounds per square inch (psi) is a unit of pressure that is used to measure the force per unit area exerted by a fluid or gas.
Correct answer: pounds per square inch- A. Atm
- B. Pascal
- C. mm of Hg
- D. Millibar
Explanation: Option D is correct since Meteorologists use a metric unit for pressure called a millibar and the average pressure at sea level is 1013.25…
Correct answer: Millibar- A. Increase by 4 times
- B. Decrease by 4 times
- C. Decrease by 2 times
- D. Increase by 2 times
Explanation: According to Charles's Law, which describes the relationship between the volume and temperature of a gas, if we decrease the temperature…
Correct answer: Decrease by 2 times