Which of the following is NOT a correct value of the general gas constant R?
Correct answer B. 8.314 dm³ atm K⁻¹ mol⁻¹
Subject / 763 questions
MDCAT ECAT Chemistry MCQs
Page 36 of MDCAT ECAT Chemistry multiple-choice questions with answers. Tap an option to check yourself.
Page 36 of 39
- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
In SI units, the gas constant R is expressed as ____
Correct answer C. N m K⁻¹ mol⁻¹
How many moles of gas occupy 4.1 dm³ at 2.0 atm and 400 K (R = 0.0821 dm³ atm K⁻¹ mol⁻¹)?
Correct answer B. 0.25 mol
Advertisement
A gas has a density of 1.25 g dm⁻³ at STP. Which of these gases could it be?
Correct answer B. N₂
What pressure is exerted by 0.50 mol of an ideal gas in a 10 dm³ vessel at 27 °C (R = 0.0821 dm³ atm K⁻¹ mol⁻¹)?
Correct answer D. 1.23 atm
Under which conditions do real gases deviate most from ideal behaviour?
Correct answer C. High pressure and low temperature
According to the kinetic molecular theory, collisions between gas molecules are ____
Correct answer D. perfectly elastic
According to the kinetic molecular theory, the average kinetic energy of gas molecules is directly proportional to the ____
Correct answer D. absolute temperature
Which pair of conditions represents STP?
Correct answer D. 0 °C and 760 mm Hg
Advertisement
A gas exerts a pressure of 380 mm Hg. What is this pressure in kilopascals (1 atm = 760 mm Hg = 101.325 kPa)?
Correct answer B. 50.7 kPa
A gas occupies 2.0 dm³ at 1.0 atm. At constant temperature it is compressed to 0.50 dm³. What is its new pressure?
Correct answer A. 4.0 atm
A gas occupies 300 cm³ at 27 °C. What is its volume at 127 °C if pressure stays constant?
Correct answer C. 400 cm³
Absolute zero is the temperature at which ____
Correct answer D. the volume of an ideal gas would theoretically become zero
Which orbital consists of two lobes along the z axis with a doughnut-shaped ring around its centre?
Correct answer C. dz²
An s orbital has which shape?
Correct answer C. Spherical
Advertisement
The lines of the Balmer series in the hydrogen spectrum are produced when electrons fall to which level?
Correct answer B. n = 2
What is the wavelength of the line emitted when a hydrogen electron falls from n = 3 to n = 2 (R = 1.097 × 10⁷ m⁻¹)?
Correct answer B. 656 nm
How much energy is needed to remove the electron from the n = 2 level of a hydrogen atom (Eₙ = −13.6/n² eV)?
Correct answer A. 3.4 eV
Using the (n + l) rule, which subshell is filled immediately after 4p?
Correct answer C. 5s
Which statement expresses Pauli’s exclusion principle?
Correct answer A. No two electrons in an atom can have the same set of four quantum numbers