Gaseous Laws and Ideal Gas Equation

Author:Embibe Experts
Chemistry
IMPORTANT

Important Questions on Gaseous Laws and Ideal Gas Equation

EASY
IMPORTANT

Two containers are connected by a tube of negligible volume, container(I) has N2g gas at pressure 4 atm and temperature T(K) and container(II) has 1 litre H2Ol at temperature (T) initially. Find correct option(s) after stopcock is removed. (aq. Tension =190 torr)

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EASY
IMPORTANT

One mole of N2( g) is taken in 1 litre empty container fitted with a movable piston at 300K. If it is heated to 1200K at constant pressure then match the change (List-II) in parameters (List - I) of gas as compared to initial state & select the correct code.

List-I (Parameter) List-II (Change)
P Z1 (number of collision made by a molecule per unit time) 1 18
Q Z11 (collision frequency) 2 2
R λ (mean free path) 3 12
S U (root mean square speed) 4 4

MEDIUM
IMPORTANT

Which of the following curves does not represent Boyle's law:

MEDIUM
IMPORTANT

V us T curves at constant P1 and P2 for an ideal gas are shown in figure. Which is correct :

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HARD
IMPORTANT

A hydrocarbon contains 10.5 g of carbon per gm of H. One litre vapours of hydrocarbon at 127°C and 1 atm pressure weighs 2.8 g. The molecular formula of hydrocarbon is :

MEDIUM
IMPORTANT

One molecule of haemoglobin will combine with four molecules of oxygen. If 1.0 g of haemoglobin combines with 1.53 mL of O2 at body temperature 37 °C and a pressure of 743 torr, what is the molar mass of haemoglobin?

If the answer is of type y×103 g mol-1, report the value of y correct up to nearest integer.

MEDIUM
IMPORTANT

A sample of natural gas is 85.2% of methane (CH4) and 14.8% of ethane (C2H6) by mass. What would be the density in g/L of this mixture at 18°C and 748 mmHg?

Answer by rounding off up to two places of decimals.

MEDIUM
IMPORTANT

The vapour pressure of water at 20°C is 17.5 mm Hg. Calculate the mass of water (in mg) per litre of air at 20°C and 45% relative humidity. R=0.0821 atm L mol-1 K-1

Answer correct up to two places of decimals.

HARD
IMPORTANT

After 11.2 g of carbon reacts with oxygen originally occupying 21.2 litres at 18°C and 750 mm of Hg, the cooled gases are passed through 3 litres of 2.50 M NaOH solution. Determine the concentration of NaOH remaining in the solution which is not converted to Na2CO3.

[Note: CO does not react with NaOH under these conditions.]

HARD
IMPORTANT

Assume that the centre of the sun consists of gases whose average molecular weight is 2. The density and pressure of the gases are 1.3 g mL-1 and 1.12×109 atm, respectively. Find the temperature. If T = y × 107 K then y is:

MEDIUM
IMPORTANT

A certain quantity of a gas occupied 50 mL when collected over water at 15°C and 750 mmHg pressure. If the dry gas occupies 45.95 mL at NTP, calculate the aqueous tension (in mmHg ) at 15°C.

MEDIUM
IMPORTANT

A volume of a gas weighing 8 g was allowed to expand at a constant temperature until the pressure of the gas reduced to one-half of its former value. It was found that 500 mL of the gas weighed 1.25 g. Determine the initial density of the gas in g L-1.

MEDIUM
IMPORTANT

Mercury diffusion pumps may be used in the laboratory to produce a high vacuum. Cold traps are generally placed between the pump and the system to be evacuated. These cause the condensation of Hg vapours, and prevent mercury from diffusing back into the system. The maximum pressure of mercury that can exist in the system is the vapour pressure of mercury at the temperature of the cold trap. Calculate the number of mercury-vapour molecules per cc present in a cold trap maintained at -120°C. The vapour pressure of mercury at this temperature is 10-6 mm. If answer is a×1010 report a.

HARD
IMPORTANT

A glass tube sealed at both the ends is 100 cm long. It lies horizontally with the mid 10 cm containing Hg. The two ends of the tube contain air at a temperature of 27°C and a pressure 76 cm Hg. The air column on one side is maintained at 0°C and 127°C on the other side. Calculate the length of the air column on the cooler side. Neglect the changes in the volume of mercury and of the glass.