States of Matter Solid, Liquid and Gas MCQ Questions & Answers in Physical Chemistry | Chemistry
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191.
A closed flask contains water in all its three states solid, liquid and vapour at $${0^ \circ }C.$$ In this situation, the average kinetic energy of water molecules will be
A
the greatest in all the three states
B
the greatest in vapour state
C
the greatest in the liquid state
D
the greatest in the solid state
Answer :
the greatest in vapour state
In the three states of matter, the maximum kinetic energy is possessed by the gaseous
molecules, so water vapour state has maximum kinetic energy in this situation.
192.
Densities of two gases are in the ratio 1 : 2 and their temperatures are in the ratio 2 : 1 then the ratio of their respective pressures is
193.
At Boyle's temperature, compressibility factor $$Z$$ for a real gas is
A
$$1$$
B
$$0$$
C
$$>1$$
D
$$<1$$
Answer :
$$1$$
At Boyle's temperature, real gases behave like ideal gases and $$Z = 1.$$
194.
Volume of a given mass of gas at $${17^ \circ }C$$ is measured as $$200\,c{m^3}.$$ The volume of the same mass of gas at same pressure and a temperature of $${47^ \circ }C$$ will be
195.
0.5 moles of gas $$A$$ and $$x$$ moles of gas $$B$$ exert a pressure of 200 $$Pa$$ in a container of volume $$10\,{m^3}$$ at 1000 $$K.$$ Given $$R$$ is the gas constant in $$J{K^{ - 1}}\,mo{l^{ - 1}},x$$ is :
A
$$\frac{{2R}}{{4 + R}}$$
B
$$\frac{{2R}}{{4 - R}}$$
C
$$\frac{{4 + R}}{{2R}}$$
D
$$\frac{{4 - R}}{{2R}}$$
Answer :
$$\frac{{4 - R}}{{2R}}$$
Ideal gas equation: $$PV = nRT$$
After putting the values we get,
$$\eqalign{
& 200 \times 10 = \left( {0.5 + x} \right) \times R \times 1000 \cr
& \left( {{\text{total no}}{\text{. of moles are}}\,0.5 + x} \right) \cr
& x = \frac{{4 - R}}{{2R}} \cr} $$
196.
The volume of $$0.0168\,mol$$ of $${O_2}$$ obtained by decomposition of $$KCl{O_3}$$ and collected by displacement of water is $$428$$ $$mL$$ at a pressure of $$754\,mm\,Hg$$ at $${25^ \circ }C.$$ The pressure of water vapour $${25^ \circ }C.$$
The numerical value of $$R$$ depends upon the units in which pressure and volume are expressed. When pressure is expressed in atmosphere and volume in litres, then the value of $$R$$ at $$STP$$ for $$1\,mole$$ of gas is
$$\eqalign{
& R = \frac{{1atm \times 22.414\,L}}{{1\,mole \times 273.15\,K}} \cr
& \,\,\,\,\,\, = 0.082\,L\,atm\,{K^{ - 1}}mo{l^{ - 1}} \cr} $$
199.
What is the density of $$C{O_2}$$ at $$27{\,^ \circ }C$$ and $$2.5\,atm$$ pressure ?