Free Ideal Gas Equation MCQs with Answers
94 Ideal Gas Equation MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The ideal gas equation, PV = nRT, relates pressure, volume, amount and absolute temperature when gas particles are assumed to have negligible volume and no intermolecular forces. Applications include finding molar mass, density or an unknown gas variable, with careful use of Kelvin temperature and consistent units, and comparison with real-gas behaviour.
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- A. 5.6 dm3
- B. 11.2 dm3
- C. 22.4 dm3
- D. 44.8 dm3
Explanation: One mole of any ideal gas occupies 22.4 dm3 at STP, so half a mole occupies 11.2 dm3.
Correct answer: 11.2 dm3- A. PV equals nRT
- B. PV equals nR divided by T
- C. P divided by V equals nRT
- D. PVT equals nR
Explanation: The equation combines Boyle's, Charles's and Avogadro's laws into one relation, with R the universal gas constant at 8.314 J per mole per…
Correct answer: PV equals nRT- A. 22.4 dm3
- B. 44.8 dm3
- C. 11.2 dm3
- D. 24 dm3
Explanation: One mole occupies 22.4 dm3 at STP, so two moles occupy twice that, which is 44.8 dm3.
Correct answer: 44.8 dm3- A. the product of the individual pressures
- B. the sum of the partial pressures of the component gases
- C. the average of the individual pressures
- D. the pressure of the heaviest gas
Explanation: Because ideal gas molecules do not interact, each gas exerts the pressure it would exert alone in the same volume, and these simply add.
Correct answer: the sum of the partial pressures of the component gases5. A fixed mass of gas at 2 atm and 300 K is heated to 600 K at constant volume. The new pressure is
- A. 1 atm
- B. 2 atm
- C. 4 atm
- D. 8 atm
Explanation: Pressure is proportional to absolute temperature at constant volume, so doubling the temperature in kelvin doubles the pressure to 4 atm.
Correct answer: 4 atm- A. 8.314
- B. 62.4
- C. 0.821
- D. 62400
Explanation: The universal gas constant is 8.314 joules per mole per kelvin, and this is the value to use whenever pressure is in pascals and volume in…
Correct answer: 8.314- A. Raised
- B. Depressed
- C. Compressed
- D. Remains same
Explanation: In a manometer, the liquid column on the side exposed to greater pressure is pushed down, so that column is depressed.
Correct answer: Depressed- A. 1.65 g/L
- B. 1.67 g/L
- C. 1.68 g/L
- D. None of the above
Explanation: Using the ideal-gas density relation d = PM/RT, d = (1.05 atm x 39.95 g/mol) / (0.0821 L atm mol^-1 K^-1 x 303 K) = 1.69 g/L, which rounds…
Correct answer: 1.68 g/L- A. CH4
- B. CO2
- C. C2H4
- D. Xe
Explanation: At 273 K and 76 cm Hg, the gas is at STP, where one mole occupies about 22.4 dm3.
Correct answer: CO2- A. 98.5 atm
- B. 96.7 atm
- C. 95.8 atm
- D. 97.1 atm
Explanation: Using PV = nRT, P = nRT/V = (1 mol)(0.0821 L atm K^-1 mol^-1)(300 K)/(0.250 L) = 98.52 atm, which rounds to 98.5 atm.
Correct answer: 98.5 atm- A. 0.0821 atm dm3k-1mol-
- B. 0.0821 atm m3k-1mol-1
- C. 2 cal k-1 mol-1
- D. 8.314 Nm2k-1mol-1
Explanation: The gas constant can be written as R = 0.0821 L atm K^-1 mol^-1, equivalent to 0.0821 dm3 atm K^-1 mol^-1, so option a has the intended…
Correct answer: 0.0821 atm dm3k-1mol-- A. 22.414 m3
- B. 44.828 dm3
- C. 22.414 dm3
- D. 11.212 cm3
Explanation: Apply PV = nRT: V = nRT/P = (1 mol x 0.082057 L atm mol-1 K-1 x 546.5 K)/(2 atm) = 22.414 L. Since 1 L = 1 dm3, the volume is 22.414 dm3.
Correct answer: 22.414 dm313. At constant temperature the pressure of an ideal gas is doubled its density becomes_______________?
- A. Half
- B. Double
- C. Same
- D. None
Explanation: For a fixed amount of ideal gas at constant temperature, density is given by d = PM/RT.
Correct answer: Double- A. one / seventeen
- B. sixteen / seventeen
- C. one / three
- D. two / three
Explanation: For equal masses, take 32 g of each gas: 32 g CH4 ÷ 16 g mol-1 = 2.0 mol CH4, while 32 g O2 ÷ 32 g mol-1 = 1.0 mol O2.
Correct answer: one / three- A. pressure
- B. volume
- C. moles
- D. density
Explanation: The ideal gas equation uses pressure, volume, temperature, and amount of gas in moles: PV = nRT.
Correct answer: density- A. 0.5
- B. 4
- C. 1
- D. 2
Explanation: The balanced chemical equation for the reaction is:Q(s) + O2(g) → QO2(g)According to the problem, 2 moles of O2(g) are used to produce 1…
Correct answer: 1- A. 8.314 Jmole K
- B. 8.314 J/mol K
- C. 8.314 Jmole K^−1
- D. 3.148 J/moleK
Explanation: The value of the universal gas constant (R) is approximately 8.314 J/mol K8.314J/mol K.
Correct answer: 8.314 J/mol K18. At constant temperature when the volume of the given mass of gas is doubled, its density becomes
- A. Double
- B. One fourth
- C. Four times
- D. Half
Explanation: At constant temperature, the density of a gas is inversely proportional to its volume.
Correct answer: Half- A. Increases by factor 4
- B. Decreases by factor 4
- C. Increases by factor 2
- D. Decreases by factor 2
Explanation: According to Gay-Lussac's Law (P ∝ T at constant volume), pressure is directly proportional to the absolute temperature.
Correct answer: Increases by factor 4- A. Volume = decrease temperature = decrease
- B. Volume = decrease temperature = increase
- C. Volume = increase temperature =decrease
- D. Volume = increase temperature = increase
Explanation: Option: A As volume and temperature are directly proportional to each other, so, by decreasing volume, temperature will also decrease.
Correct answer: Volume = decrease temperature = decreaseIdeal Gas Equation MCQs: common questions
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