Direction [Q. Nos. 1-20] This section contains 20 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Q. Air entering the lungs ends up in tiny sacs called alveoli form which oxygen diffuses into the blood. The average radius of the alveoli is 0.0050 cm (of spherical shape}, and the air inside contains 14 mole per cent oxygen. Assuming that the pressure in the alveoli is 1.0 atm and the temperature is 37°C. Calculate number of oxygen molecules in one of the alveoli.
The oxygen gas generated in an in vitro photosynthesis experiment is collected over water. The volume of the gas collected at 22.0°C and 1 atm is 186 mL . Calculate the mass of oxygen obtained. The vapour pressure of water at 22.0°C is 19.8 torr.
The pressure of gaseous mixture of NH3 and N2 decreased from 1.5 kPa to 1.00 kPa after NH3 was absorbed from the mixture. Assuming ideal gas behaviour, mole fraction of N2 in the mixture is
What is the value of for an ideal gas at 1 bar and 0°C?
What is the value of at constant V ?
Q. Thus, ratio of molar volume of water vapour to that of liquid water at 25°C is
A commercial gas cylinder contains 75 L of helium at 15 bar (gauge pressure). Assuming ideal gas behaviour for the isothermal expansion, how many 3.0 L balloons at a pressure of 1.1 bar can be filled by this gas in this cylinder?
A 1.10 L flask containing nitrogen at a pressure of 710.0 torr is connected to an evacuated flask of unknown volume. The nitrogen, which acts ideally, is allowed to expand into the combined system of both flasks isothermally. If the final pressure of the nitrogen is 5809.0 torr, volume of the evacuated flask is
Nitrogen dioxide (NO2) cannot be obtained in a pure form in the gas phase at exists as a mixture of NO2 and N2O4. At 298 K and 0.98 atm, the density of this gas mixture is 2.764 g L-1, Thus partial pressure of NO2 in the mixture is
Nitrogen forms several gaseous oxides. One of them has a density of 1.27 g L-1 at 764 mrn Hg and 150°C. Thus oxide is
A sample of neon gas is heated from 300 K to 390 K. Percentage increase in kinetic energy is
Dissolving 3.00 g of an impure sample of CaCO3 in an excess of HCI acid produced 0.656 L of CO2 (measured at 20°C and 792 mm Hg). Thus, percentage by mass of CaCO3 in the sample is
What will be the volume change corresponding to an increase of 0.01 mole at 25°C? The molar volume of an ideal gas under these conditions is 24.8 Lmol-1,
Identify which of the following isotherms for a fixed amount of an ideal gas at constant temperature will not be linear?
The density of helium gas will be highest at
An empty container is filled with equal am ounts of CH4 and N2 gases. The fraction of the total pressure exerted by N2 is
A gas would show maximum deviations from ideal gas behaviour at
The values of the van der Waals’ constant (dm6 atm mol-2) for the gases are given
Q. The gas which can be most easily liquefied is
Average molar m ass of air is 29.og mol-1. At the altitude of x * 103 m ,atmosphere pressure decreases from 1.00 bar to 0.50 bar. What is the value of x?
At the normal boiling point of water, for water at the boiling point, assuming that water vapour acts ideally, is