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 18 of 23
- A. 76cm
- B. 76mm
- C. 76dm
- D. 76pm
Explanation: At sea level, the atmosphere exerts a pressure of 760mm Hg. This is used to define another pressure unit called the atmosphere (atm).One…
Correct answer: 76cm- A. 16 torr
- B. 159 torr
- C. 158 torr
- D. 157 torr
Explanation: Option B is correct as group level partial pressure effect oxygen is "159 torr". Any less than that causes discomfort in breathing.
Correct answer: 159 torr- A. 10:1
- B. 1:2
- C. 2:3
- D. 3:2
- E. 2:1
Explanation: No of moles=mass in g/MrMoles of water = 18/18 =1 mol 1mol=24dm3 so volume of water is also 24dm3 Moles of CO2= 4.4/44 = 0.1 moles0.1x24=…
Correct answer: 10:1344. Liquid in the container has a temperature 70°C. What will be the temperature on the Kelvin scale?
- A. 350 K
- B. 343 K
- C. 300 K
- D. 283 K
Explanation: To convert temperature from celsius to kelvin scale the formula is: °C + 273.15 K 70° + 273.15 = 343 K Therefore, option b is correct.
Correct answer: 343 K345. If 1/V is plotted on X-axis and pressure on Y-axis at constant temperature, what should appear:
- A. Straight line parallel to x-axis
- B. Straight line parallel to y-axis
- C. Straight line passing through origin
- D. Curve
Explanation: If 1/V is plotted on the X-axis and pressure on the Y-axis at constant temperature, a straight line passing through the origin will…
Correct answer: Straight line passing through origin- A. high temperature and low pressure
- B. low temperature and high pressure
- C. standard temperature and pressure
- D. any temperature, equally
Explanation: Compressing a gas brings the molecules close enough for their own volume and their mutual attractions to matter, and cooling reduces the…
Correct answer: low temperature and high pressure- A. This is cleanest patch I've ever seen," I bragged.
- B. see," I bragged. This is the cleanest patch I've ever
- C. This is the cleanest patch I've ever seen," I bragged.
- D. This is a cleanest patch I've ever seen," I bragged.
Explanation: The correct answer is option C: This is the cleanest patch I've ever seen," I bragged..
Correct answer: This is the cleanest patch I've ever seen," I bragged.- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The general gas equation, also known as the ideal gas equation, is a mathematical equation that describes the relationship between…
Correct answer: Option D- A. 8.314 atm dm3 mol K-1
- B. 0.0821 Jmol-1 K-1
- C. 62.4 torr cm3 mol-1K-1
- D. 8.314 x 10^7erg mol-1K-1
Explanation: R=8.3143 Nm.mol-1.K-1 1Nm=107erg Hence,8.3143*107erg.mol-1K-1
Correct answer: 8.314 x 10^7erg mol-1K-1- A. 100 dm3
- B. 75 dm3
- C. 19.5 dm3
- D. 51 dm3
Explanation: To find the volume of the gas at STP (Standard Temperature and Pressure), we apply the combined gas law equation:(P1 * V1) / T1 = (P2 *…
Correct answer: 19.5 dm3- A. Gas is at high pressure
- B. Collision between particles are elastic
- C. There are weak forces of attraction between particles in gas
- D. Total energy of particles is proportional to the temperature
Explanation: The five main postulates of the KMT are as follows: (1) The particles in a gas are in constant, random motion.
Correct answer: Collision between particles are elastic- A. Increases on increasing temperature
- B. Decreases on increasing temperature
- C. Unchanged on changing temperature
- D. Increases some where and decreases
Explanation: The average distance covered by the gas between successive collisions is known as mean free path.The formula given below clearly denotes…
Correct answer: Increases on increasing temperature- A. Pressure = high density = high
- B. Pressure = low density = high
- C. Pressure = high density = low
- D. Pressure = low density = low
Explanation: The physically correct condition is low pressure and high temperature, which corresponds to low density.
Correct answer: Pressure = low density = high- A. Pressure = high density = high
- B. Pressure = low density = high
- C. Pressure = hight density = low
- D. Pressure = low density = low
Explanation: Real gases approximate ideal gas behavior at relatively low density, low pressure, and high temperature.At high temperatures, the gas…
Correct answer: Pressure = low density = low- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: At low pressure P, volume V is high. V-b will approximately be equal to V so b is neglegibe.
Correct answer: Option B- A. H2SO4
- B. HNO3
- C. both A and B
- D. none
Explanation: Sulfur dioxide is oxidised to sulfuric acid and nitrogen oxides form nitric acid in atmospheric moisture, so acid rain commonly contains…
Correct answer: both A and B- A. Directly proportional
- B. Inversely proportional
- C. Constant
- D. None of these are correct
Explanation: PV=nRT is the overall ideal gas equation derived from Boyle's and Charle's law.
Correct answer: Inversely proportional- A. Variable
- B. Constant
- C. Discrete
- D. Decreasing
Explanation: According to Boyle's law, the pressure of a fixed amount of gas varies inversely with its volume, the temperature is maintained…
Correct answer: Constant- A. i only
- B. iii only
- C. i and ii only
- D. i and iii only
- E. ii and iii only
Explanation: The explanation for this question will be added soon.
Correct answer: iii only- A. Pressure
- B. Temperature
- C. Volume
- D. Number of moles
Explanation: Correct option is B. Charles's law states that: "the volume of a given mass of gas is directly proportional to its absolute temperature…
Correct answer: Temperature