States of Matter (Gases and Liquids) — practice questions

103 curated practice questions from States of Matter (Gases and Liquids) (Chemistry JEE Advanced, NTA Exams) — 95 hard, 8 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.

• The ratio between the root mean square speed of H 2 at 50K and that of O 2 at 800 K is (1996)
• The density of a gas is 1.4 g/ml at one atmosphere pressure and 27ºC. At what pressure will the gas have density thrice…
• The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular weight of X is (1990)
• Which of the following gases has the highest value of the van der Waals constant a ?
• Vander waal’s constant ‘a’ and ‘b’ are related with....respectively
• The van der Waals’ constants of a gas are a = 0.751 dm 6 atm mol –2 b = 0.0226 dm 3 mol –1 Hence,
• Assertion (A): According to Charles’ law, for a given amount of an ideal gas at a given pressure, plot of gas volume…
• Densities of two gases having same molar mass are in the ratio 1 : 2 and their temperatures are in the ratio 2 : 1…
• X and Y are two volatile liquids with molar weights of 10 g mol –1 and 40 g mol –1 respectively. Two cotton plugs, one…
• (P+ n^ 2 a V^ 2 )(V-n b)=n R T Which of the following statements is/are correct ?
• Assertion (A): According to kinetic theory of gases, gas molecules are elastic. Reason (R): Gases can be liquefied and…
• X ml of H 2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume…
• A open ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure…
• Assertion (A) : The pressure of a fixed amount of an ideal gas is proportional to its tempreature. Reason (R)…
• The term that corrects for the attractive forces present in a real gas in the van der Waals’ equation is (2009)
• To raise the volume of the gas by four times, which of the following methods are correct ?
• To which of the following gaseous mixtures is Dalton’s law not applicable ?
• A fixed thermally conducting cylinder has a radius R and height L 0 . The cylinder is open at its bottom and has a…
• If the absolute temperature of a gas is doubled and the pressure is reduced to one-half, the volume of the gas will
• Calculate the number of moles in the glass bulb shown in figure at 300 K. Given : d glycerine = 2.72 g/mL; d mercury =…
• 1.0 litre of N 2 and 7/8 litre of O 2 at the same temperature and pressure were mixed together. What is relation…
• The diagram displays the plot of the compression factor Z versus p for a few gases. Which of the following statement(s)…
• The critical temperature of water is higher than that of O 2 because the H 2 O molecule has (1997)
• Assertion (A): Different gases at the same condition of temperature and pressure have same root mean square speed…
• A closed vessel contains 10 g of an ideal gas X at 300 K, which exerts 2 atm pressure. At the same temperature, 80 g of…
• The average velocity of an ideal gas molecule at 27ºC is 0.3 m/s. The average velocity at 927º C will be (1986)
• If helium and methane are allowed to diffuse out of the container under the similar conditions of temperature and…
• If the weight of 5.6 litres of a gas at NTP is 11 gm. The gas may be
• 50 ml of gas A diffuses through a membrane in the same time as for the diffusion of 40 ml of a gas B under identical…
• Density of gas is inversely proportional to temperature and directly proportional to pressure. ⇒ d P ~T ⇒ dT P =…
• Consider the adjacent diagram to answer these questions : Initially, flask A contained oxygen gas at 27ºC and 950 mm of…
• At what temperature will the average speed of CH 4 molecules have the same value as O 2 has at 300 K ?
• At the same temperature and pressure, which of the following gases will have the highest average kinetic energy per…
• Consider the adjacent diagram to answer these questions : Initially, flask A contained oxygen gas at 27ºC and 950 mm of…
• Assertion (A): A lighter gas diffuses more rapidly than a heavier gas. Reason (R): At a given temperature , the rate of…
• Equal weights of methane and hydrogen are mixed in an empty container at 25ºC. The fraction of the total pressure…
• Assertion (A): For a given amount of an ideal gas, a plot of pressure (p) versus (1/V) is a straight line at a constant…
• Helium diffuses twice as fast as another gas B. If the vapour density of helium is 2, the molecular weight of B is
• Density of gas is inversely proportional to temperature and directly proportional to pressure. ⇒ d P ~T ⇒ dT P =…
• Assertion (A): Compressibility factor (Z) for non-ideal gases is always greater than 1. Reason (R): Non-ideal gases…
• The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is
• When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules (1984)
• Assertion (A): When hydrogen gas expands adiabatically from high pressure to low pressure at room temperature then…
• The compressibility factor of a gas is defined as Z = PV RT . The compressibility factor of ideal gas is
• Assertion (A): For a real gas, the gas pressure is always less than the pressure calculated from kinetic theory of…
• In van der Waals’ equation of state for a non-ideal gas, the term that accounts for intermolecular forces is (1988)
• The ratio of root mean square velocity to average velocity of a gas molecule at a particular temperature is (1981)
• Which of the following volume (V)-temperature (T) plots represents the behaviour of one mole of an ideal gas at the…
• The root mean square velocity of an ideal gas at constant pressure varies with density (d) as (2001)
• The factor(s) which measure(s) the deviation from ideal behaviour of a gas are
• Arrange the van der Waals constant a for the gases: I. C 6 H 6( g ) A. 0.217 II. C 6 H 5 CH 3( g ) B. 5.464 III. Ne ( g…
• For one mole of a van der Waals’ gas when b = 0 and T = 300 K, the pV vs. 1/V plot is shown below. The value of the van…
• Consider the adjacent diagram to answer these questions : Initially, flask A contained oxygen gas at 27ºC and 950 mm of…
• Two container each containing liquid water are connected as shown in diagram Given that vapour pressure of H 2 O ( l )…
• Positive deviation from ideal behaviour takes place because of (2003)
• Density of gas is inversely proportional to temperature and directly proportional to pressure. ⇒ d P ~T ⇒ dT P =…
• Equal weights of ethane and hydrogen are mixed in an empty container at 25ºC. The fraction of the total pressure…
• A liquid is in equilibrium with its vapour at its boiling point. On the average, the molecules in the two phases have…
• According to Graham’s law, at a given temperature the ratio of the rates of diffusion r A /r B of gases A and B is…
• The r.m.s. velocity of hydrogen is 7 time the r.m.s. velocity of nitrogen. If T is the temperature of the gas, (2000)
• Which of the following statement(s) is (are) correct regarding the root mean square speed (U rms ) and average…
• Assertion (A): Above critical temperature gaseous state cannot be observed. Reason (R): Above critical temperature, the…
• The given graph represent the variations of Z (compressibility factor (Z) = . pV nRT ) versus p, for three real gases…
• An open flask contains air at 27 o C temperature and one atm pressure. The flask is heated to 127 o C at the same…
• Positive deviation from ideal behaviour takes place because of
• The graph of P vs V is given at different temperatures and number of moles The correct relationship are
• Which one of the following plot will be a parabola at constant temperature ?
• A mixture of CO and CO 2 is found to have a density of 1.5 g/L at 30 0 C and 730 torr. The composition of mixture is
• Assertion (A): The value of van der Waals’ constant ‘a’ is larger for ammonia than for nitrogen. Reason (R): Hydrogen…
• The molecules of which of the following gases has the highest speed ?
• The values of van der Waals’ constant a for the gases O 2 , N 2 , NH 3 and CH 4 are 1.360, 1.390, 4.170 and 2.253 L 2…
• Assertion (A): The pressure of a gas is inversely proportional to the volume at constant temperature and n. Reason (R)…
• The kinetic energy of one mole of a gas is given by the expression : K E = 3 PV 2 and K.E. = 3 2 RT Hence, it can be…
• The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is (1981)
• Assertion (A): The gases He and H 2 are very different in their behaviour at any temperature and pressure but their…
• Equal weights of ethane and hydrogen are mixed in an empty container at 25 o C.The fraction of the total pressure…
• Five grams each of the following gases at 87 o C and 750 mm pressure are taken. Which of them will have the least…
• A closed compartment containing gas is moving with some acceleration in horizontal direction. Neglect effect of…
• X and Y are two volatile liquids with molar weights of 10 g mol –1 and 40 g mol –1 respectively. Two cotton plugs, one…
• The compressibility of a gas is less than unity at STP. Therefore, (2000)
• According to kinetic theory of gases, for a diatomic molecule
• The atomic weight of helium is 4 times of hydrogen. Its rate of diffusion as compared to hydrogen is
• Equal weights of methane and oxygen are mixed in an empty container at 25ºC. The fraction of the total pressure exerted…
• Assertion (A): Most probable velocity is the velocity possessed by maximum fraction of molecules at the same…
• A flask containing air (open to atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the…
• At N.T.P. the volume of a gas is found to be 273 mL. what will be the volume of this gas at 600 mm Hg and 273ºC ?
• If the pressure is tripled and temperature (in kelvins) is halved, the volume of a given mass of an ideal gas becomes
• One mole of a monoatomic real gas satisfies the equation p ( ~V - b )= RT where b is a constant. The relationship of…
• The term that corrects for the attractive forces present in a real gas in the van der Waals equation is
• A liquid is in equilibrium with its vapour at it’s boiling point. On the average, the molecules in the two phases have…
• A bottle of dry ammonia and a bottle of dry hydrogen chloride connected through a long tube are opened simultaneously…
• At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with rise of temperature due…
• Helium atom is two times heavier than a hydrogen molecule At 298 K, the average kinetic energy of a helium atom is…
• At 100ºC and 1 atm if the density of the liquid water is 1.0 g cm –3 and that of water vapour is 0.0006 g cm –3 , then…
• Which of the following exhibits the weakest intermolecular forces ?
• For a monatomic gas kinetic energy = E. The relation with rms velocity is (2004)
• Among the plots, which of them represent Charle’s law, at constant pressure ?
• In a closed flask of 5 litres, 1.0 g of H 2 is heated from 300 to 600 K. Which statements is not correct ?
• How many O 2 molecules are present in 2.0 L of oxygen gas at 27 o C temperature and 3.0 atm pressure ?
• NH 3 can be liquefied at ordinary temperature without the application of pressure. But O 2 cannot, because
• The value of van der Waals’ constant ‘a’ for the gases O 2 , N 2 , NH 3 and CH 4 are 1.360, 1.390, 4.170 and 2.253L 2…
• A given quantity of an ideal gas is at pressure P and absolute temperature T . The isothermal bulk modulus of the gas is
• According to kinetic theory of gases, for a diatomic molecule (1991)

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