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 11 of 23
- A. 57.5 mL
- B. 87.6 mL
- C. 93.5 mL
- D. 68.7 mL
Explanation: Initial volume V1 = 73.5 mL Initial pressure P1 = 710 torr Final Pressure P2 = 760 torr (standard pressure) Temperature = 30°C Final…
Correct answer: 68.7 mL- A. PV/RT=n
- B. PV=mRT
- C. V=nRT/P
- D. PV=nRT
Explanation: In the general gas equation, volume is directly proportional to number of moles and temperature, and volume is inversely proportional to…
Correct answer: PV=nRT- A. Always greater than 1
- B. Always smaller than 1
- C. May be equal or less than 1
- D. Always 1
Explanation: c) May be equal or less than 1: This option is correct. The sum of mole fractions of gases in a mixture can be equal to 1 or less than 1.
Correct answer: May be equal or less than 1204. If pressure is reduced to one-half and the temperature of a gas is doubled, what will be the volume?
- A. Reduced 4 times
- B. Increased 4 times
- C. Remains same
- D. Gets doubled
Explanation: Option A: Reduced 4 times: This option suggests that the volume of the gas would be reduced by a factor of 4.
Correct answer: Increased 4 times- A. Neon
- B. Helium
- C. Argon
- D. Krypton
Explanation: The main reason for adding helium to the breathing mix is to reduce the proportions of nitrogen and oxygen below those of air, to allow…
Correct answer: Helium- A. M/6
- B. 2M
- C. 6M
- D. 6/M
Explanation: Density is defined as mass per unit volume. In this case, the density of gas X is given as 6 times the density of gas Y.
Correct answer: M/6- A. Decrease, Increase
- B. Increase, Decrease
- C. Falls, Constant
- D. Constant, constant
Explanation: The density of an ideal gas decreases as its temperature increases and its pressure decreases.
Correct answer: Increase, Decrease208. The mole fractions of a gas multiplied by the total pressure of the mixture are called_of a gas.
- A. Partial volume
- B. Partial pressure
- C. Partial temperature
- D. Number of moles
Explanation: Option A: The actual volume occupied by one species of molecule or particle in a solution.
Correct answer: Partial pressure- A. Volume and temperature
- B. Volume and pressure
- C. Volume and number of moles
- D. Volume and external conditions
Explanation: All of the following given relations can be stated as ideal gas laws. Boyle's law relates Pressure to Volume (inverse relation).
Correct answer: Volume and external conditions- A. N= PV/RT
- B. PV= nRT
- C. PV= nRT/V
- D. PV= MRT
Explanation: The general gas is represented by the formula PV= nRT where P= Pressure V= Volume n= moles R= constant T= Temperature
Correct answer: PV= nRT- A. 100 dm3
- B. 75 dm3
- C. 17 dm3
- D. 51 dm3
Explanation: To find the volume of the gas at STP (Standard Temperature and Pressure), we can use the combined gas law equation: (P1 * V1) / T1 = (P2 *…
Correct answer: 17 dm3- A. Pressure
- B. Volume
- C. Absolute temperature
- D. Molar mass of the gas
Explanation: This option is correct. The value of the gas constant 'R' is independent of the molar mass of the gas.
Correct answer: Molar mass of the gas- A. Becomes 1.5 times the initial value
- B. Becomes 1/1.5 times the initial value
- C. Becomes 2.25 times the initial value
- D. Remains the same
Explanation: According to the formula and reference given below density should decrease.
Correct answer: Remains the same- A. O2
- B. SO2
- C. NO
- D. C4H10
Explanation: SO2 has molar mass of 64 g/mole.The explanation of this question is given below.
Correct answer: SO2- A. 1410 torr
- B. 1465 torr
- C. 1520 torr
- D. 1540 torr
Explanation: When a 1 liter flask containing nitrogen and a drop or two of water at 40°C is transferred to another flask of 0.5L at the same…
Correct answer: 1465 torr- A. 1.18 g/lit
- B. 1.08 g/lit
- C. 1.28 g/lit
- D. 1.0 g/lit
Explanation: The solution for this question is given below:
Correct answer: 1.18 g/lit- A. 41.4%
- B. 8.18%
- C. 4.14%
- D. 81.8%
Explanation: In order to solve this question, the following steps must be followed; 1) find n1(initial moles) and n2 (final moles) 2) to find the…
Correct answer: 81.8%- A. 3.0 atm
- B. 1 atm
- C. 3.33 atm
- D. 2.4 atm
Explanation: PN2+PH2O =1 atmPH2O =0.3 atmPN2 =0.7 atmNow, new pressure of N2 in another vessel of volume V3 at same temperature T is given…
Correct answer: 2.4 atm- A. 1.511 L, 4.396 L
- B. 1.411 L, 4.511 L
- C. 2 L, 4.5 L
- D. 4.963 L, 1.151 L
Explanation: The correct answer is 'A' according to the solution given below:
Correct answer: 1.511 L, 4.396 L- A. 6 cc
- B. 60 cc
- C. 0.06 cc
- D. 0.6 cc
Explanation: The correct answer is D according to the solution given below: Mass of 1L of water vapour = volume x density m=V*d m= 1000 x 0.0006 m=…
Correct answer: 0.6 cc