91.
A plot of volume $$(V)$$ versus temperature $$(T)$$ for a gas at constant pressure is a straight line passing through the origin. The plots at different values of pressure are shown in figure.
Which of the following order of pressure is correct for this gas ?
A
$${P_1} > {P_2} > {P_3} > {P_4}$$
B
$${P_1} = {P_2} = {P_3} = {P_4}$$
C
$${P_1} < {P_2} < {P_3} < {P_4}$$
D
$${P_1} < {P_2} = {P_3} < {P_4}$$
Answer :
$${P_1} < {P_2} < {P_3} < {P_4}$$
92. A mixture of gases contains $${H_2}$$ and $${O_2}$$ gases in the ratio of $$1:4\left( {w/w} \right).$$ What is the molar ratio of the two gases in the mixture?
A
1 : 4
B
4 : 1
C
16 : 1
D
2 : 1
Answer :
4 : 1
93. In a face centred cubic $$(fcc)$$ lattice, a unit cell is shared equally by how many unit cells?
A
8
B
4
C
2
D
6
Answer :
6
94. If $$4\,moles$$ of an ideal gas at $$300\,K$$ occupy volume of $$89.6\,L,$$ then pressure of the gas will be
A
$$2\,atm$$
B
$$1\,atm$$
C
$$1.099\,atm$$
D
$$2.910\,atm$$
Answer :
$$1.099\,atm$$
95. Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess 'partial charges'. The partial charge is
A
more than unit electronic charge
B
equal to unit electronic charge
C
less than unit electronic charge
D
double the unit electronic charge.
Answer :
less than unit electronic charge
96. At what temperature $$28\,g$$ of $${N_2}$$ will occupy a volume of 20 litres at $$2\,atm?$$
A
300.0$$\,K$$
B
487.2$$\,K$$
C
289.6$$\,K$$
D
283.8$$\,K$$
Answer :
487.2$$\,K$$
97. When one mole of monoatomic ideal gas at $$T\,K$$ undergoes adiabatic change under a constant external pressure of 1 atm volume changes from 1 litre to 2 litre. The final temperature in Kelvin would be
A
$$\frac{T}{{{2^{\left( {\frac{2}{3}} \right)}}}}$$
B
$$T + \frac{2}{3} \times 0.0821$$
C
$$T$$
D
$$T - \frac{2}{3} \times 0.0821$$
Answer :
$$\frac{T}{{{2^{\left( {\frac{2}{3}} \right)}}}}$$
98. Rate of diffusion of a gas is :
A
directly proportional to its density.
B
directly proportional to its molecular weight.
C
directly proportional to the square root of its molecular weight.
D
inversely proportional to the square root of its molecular weight.
Answer :
inversely proportional to the square root of its molecular weight.
99. Equal masses of $${H_2},{O_2}$$ and methane have been taken in a container of volume $$V$$ at temperature $${27^ \circ }C$$ in identical conditions. The ratio of the volumes of gases $${H_2}:{O_2}:C{H_4}$$ would be
A
8 : 16 : 1
B
16 : 8 : 1
C
16 : 1: 2
D
8 : 1 : 2
Answer :
16 : 1: 2
100. If $$p, V, M, T$$ and $$R$$ are pressure, volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by
A
$$\frac{{RT}}{{pM}}$$
B
$$\frac{p}{{RT}}$$
C
$$\frac{M}{V}$$
D
$$\frac{{pM}}{{RT}}$$
Answer :
$$\frac{{pM}}{{RT}}$$