19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
X ml of H2 gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical condition is
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 pressure- temperature conditions. If the molecular weight of A is 64 that of B would be
Indicate which of the following statements are correct.
At the same temperature and pressure, which of the following gases will have the highest kinetic energy per mole ?
At what temperature will the average speed of CH4 molecules have the same value as O2 has at 300 K?
Above graph is plotted for CO2 at three different temperature i.e., 273K, 1273 K and 2773 K. Which of the following option is correct about these temperatures? T1 T2 T3 (a) 273 K 1273 K 2773 K (b) 2773 K 1273 K 273 K …
Five grams each of the following gases at 87oC and 750 mm pressure are taken. Which of them will have the least volume ?
For NH3 gas Z < 1. So the volume occupied by one mole of NH3 (Vm) at STP is
NH3 can be liquefied at ordinary temperature without the application of pressure. But O2 cannot, because
Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases Gases : H2 He O2 N2 Critical tem…
Assertion : The pressure of a gas is inversely proportional to the volume at constant temperature and n. Reason : The gas volume is directly proportional to n at constant temperature and pressure.
Assertion :For a given amount of an ideal gas, a plot of pressure (p) versus (1/V) is a straight line at a constant temperature. Reason :A given amount of an ideal gas at a constant temperature obeys Boyle’s law.
Assertion: According to Charles’ law, for a give amount of an ideal gas at a given pressure, plot of gas volume versus absolute temperature is a straight line passing through origin. Reason: Gaseous volume never vanis…
Assertion: A lighter gas diffuses more rapidly than a heavier gas. Reason: At a given temperature, the rate of diffusion of a gas is inversely proportional to the density.
Assertion :Kinetic energy and momentum of ideal gas molecules are conserved during intermolecular collision. Reason :Collision among real gas molecules is inelastic.
Assertion :According to kinetic theory of gases, gas molecules occupy some space. Reason :Gases can be liquefied and solidified.
Assertion: For a real gas, the gas pressure is always less than the pressure calculated from kinetic theory of gases. Reason: In kinetic theory, both molecular volumes and intermolecular attractions were ignored.
Assertion: Compressibility factor (Z) for non- ideal gases may be less than or greater than 1. Reason: Non-ideal gases always exert higher pressure than expected.
Assertion:CH4, CO2 has value of Z (compressibility factor) less than one at 0ºC. Reason :Z < 1 is due to the attractive forces dominate among the molecules.
Assertion :Gases do not liquefy above their critical temperature, whatever the high pressure is applied. Reason :Above critical temperature, molecular speed is high and intermolecular force cannot hold the molecules t…
Assertion :Above critical temperature liquid state cannot be observed. Reason :Above critical temperature, the average kinetic energy of a molecule is always greater than the maximum kinetic energy a molecule can poss…
The smog is essentially caused by the presence of : [Guj. CET 2004]
Which is true about DDT
The type of pollution caused by spraying of DDT
Water is often treated with chlorine to