Start learning →

IMU CET Gases — practice questions — page 3

Explore 97 free Gases questions in IMU CET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

Practise Gases with Quill →

Gases questions and exercises with answers

Showing questions 61–90 of 97.

The vapour pressure of water is the pressure exerted by water vapour under which condition?Read the answer and worked solution →For gases measured at the same temperature and pressure, reacting volume ratios are given by what?Read the answer and worked solution →Propane burns as C3H8 + 5 O2 gives 3 CO2 + 4 H2O. What volume of oxygen at the same conditions reacts with 2.7 L of propane?Read the answer and worked solution →In N2 + 3 H2 gives 2 NH3, what volume of hydrogen at the same conditions makes 683 billion cubic feet of ammonia?Read the answer and worked solution →Which set names the major greenhouse gases?Read the answer and worked solution →Without the atmosphere, the average global temperature of 14 degrees C would fall to roughly what value?Read the answer and worked solution →What name is given to the spreading of gas molecules from a region of high concentration to one of low concentration?Read the answer and worked solution →The escape of gas molecules through a tiny hole into a vacuum is known as what?Read the answer and worked solution →The average distance a gas molecule travels between collisions is called what?Read the answer and worked solution →How does the mean free path of a gas molecule change as the pressure falls?Read the answer and worked solution →The rate of diffusion of a gas depends on which set of factors?Read the answer and worked solution →Effusion occurs when a gas passes through an opening of what size?Read the answer and worked solution →Graham's law states that the rate of effusion of a gas is inversely proportional to what?Read the answer and worked solution →Who studied the rates of effusion of different gases in 1832 and formulated the law relating rate to molar mass?Read the answer and worked solution →Hydrogen has a molar mass of 2 g/mol and oxygen 32 g/mol. What is the ratio of their effusion rates?Read the answer and worked solution →Nitrogen of molar mass 28 g/mol effuses at 79 mL/s. At the same conditions, at what rate does sulfur dioxide of molar mass 64 g/mol effuse?Read the answer and worked solution →It takes 243 s for a sample of xenon, molar mass 131.3 g/mol, to effuse. How long does the same amount of neon, molar mass 20.2 g/mol, take?Read the answer and worked solution →An unknown gas effuses 1.66 times as fast as carbon dioxide, molar mass 44.0 g/mol. What is the molar mass of the unknown gas?Read the answer and worked solution →Naturally occurring uranium contains what percentage of the fissile isotope uranium-235?Read the answer and worked solution →Which uranium compound is used in gaseous diffusion enrichment plants?Read the answer and worked solution →According to kinetic molecular theory, what causes the pressure a gas exerts on its container?Read the answer and worked solution →Kinetic molecular theory assumes gas molecule collisions are elastic. What does that mean?Read the answer and worked solution →The distribution of molecular speeds in a gas sample is known by which name?Read the answer and worked solution →The kinetic energy of a single gas particle of mass m moving at speed u is given by which expression?Read the answer and worked solution →The root mean square speed of gas molecules is given by which expression?Read the answer and worked solution →Calculate the root mean square speed of a nitrogen molecule at 30 degrees C. Molar mass is 0.028 kg/mol and R is 8.314 J/mol K.Read the answer and worked solution →What is the root mean square speed of oxygen molecules at -23 degrees C? Molar mass is 0.032 kg/mol and R is 8.314 J/mol K.Read the answer and worked solution →Which value of R is used in the equation for the average kinetic energy of a mole of gas?Read the answer and worked solution →Two different gases are held at the same temperature. What do their molecules share?Read the answer and worked solution →At a fixed temperature, how do lighter gas molecules compare with heavier ones?Read the answer and worked solution →

Worked practice questions

The vapour pressure of water is the pressure exerted by water vapour under which condition?

  1. In equilibrium with liquid water
  2. When all the liquid has boiled off
  3. When the container is fully open
  4. At the moment the water freezes
Show answer and solution

Correct answer: A. In equilibrium with liquid water

1. Liquid water always has some vapour above it, because molecules keep leaving the surface. 2. In a closed container the vapour builds up until molecules return as fast as they leave. 3. The pressure of the vapour at that balance point is the vapour pressure of water. 4. It depends on temperature alone, rising steadily as the water gets hotter. _Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.3 Stoichiometry of Gaseous Substances, Mixtures, and Reactions_

Open this question →

For gases measured at the same temperature and pressure, reacting volume ratios are given by what?

  1. The molar masses of the gases
  2. The densities of the gases
  3. The ratio of their pressures
  4. The coefficients in the equation
Show answer and solution

Correct answer: D. The coefficients in the equation

1. Equal volumes of ideal gases at matched temperature and pressure hold equal numbers of molecules. 2. A balanced equation counts molecules, so those same numbers apply directly to volumes. 3. The reacting volume ratios are therefore just the balancing coefficients. 4. For nitrogen plus three hydrogen giving two ammonia, one volume of nitrogen takes three volumes of hydrogen and yields two volumes of ammonia. 5. This shortcut only works while every volume is measured at the same temperature and pressure. _Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.3 Stoichiometry of Gaseous Substances, Mixtures, and Reactions_

Open this question →

Propane burns as C3H8 + 5 O2 gives 3 CO2 + 4 H2O. What volume of oxygen at the same conditions reacts with 2.7 L of propane?

  1. 5.4 L of oxygen
  2. 13.5 L of oxygen
  3. 8.1 L of oxygen
  4. 0.54 L of oxygen
Show answer and solution

Correct answer: B. 13.5 L of oxygen

1. Both gases are measured at the same temperature and pressure, so volumes stand in for moles. 2. The balanced equation shows one propane to five oxygen. 3. So one volume of propane needs five volumes of oxygen. 4. Multiply: 2.7 L x 5 = 13.5 L of oxygen. 5. The coefficient 3 belongs to carbon dioxide, so answering 8.1 L means reading the product side by mistake. 6. No ideal gas calculation is needed here, because the shared conditions cancel out of the ratio. _Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.3 Stoichiometry of Gaseous Substances, Mixtures, and Reactions_

Open this question →

How to practise

  1. Choose a Gases question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Chemistry topics

Composition of Substances and SolutionsKinetics