CBSE Questions for Class 11 Engineering Chemistry States Of Matter Quiz 6 - MCQExams.com

Select correct statement(s) :
  • Kinetic energy is zero at $${ O }^{ 0 }$$C
  • RMS velocity of $${ O }_{ 2 }$$ at $${ 27 }^{ 0 }$$C is =$$\sqrt { \frac { 3\times 8.314\times 300 }{ 32 } } { ms }^{ -1 }$$
  • Distribution of molecules is very small when $$u\rightarrow O\quad or\quad u\rightarrow \infty $$
  • All the statement are correct

Read the Paragraph carefully and answer the following questions:

 100 g of an ideal $$\left( {mol.wt. = 40} \right)$$ gas  is present in a cylinder at $${27^0}c\;and\,2atm$$  pressure. During transportation, cylinder fell and a dent was developed in the cylinder. The valve attached to cylinder cannot keep the pressure greater than $$2atm$$ and therefore  $$'10g'$$ of gas leaked-out through cylinder.

The volume of the cylinder before a dent was:
  • $$10.79litre$$
  • $$20.79litre$$
  • $$30.79litre$$
  • $$40.79litre$$
The vapour pressure of two pure liquids $$(A)$$ and $$(B)$$ are $$100$$ and $$80\ torr$$ respectively. The total vapour pressure of solution obtained by mixing $$2$$ moles of $$(A)$$ and $$3$$ moles of $$(B)$$ would be :-
  • $$120\ torr$$
  • $$36\ torr$$
  • $$88\ torr$$
  • $$180\ torr$$
A closed bulb capacity 200ml containing $${ CH }_{ 4 }$$, $${ H }_{ 2 }$$ and He at 300K. The ratio of partial pressure of $${ CH }_{ 4 }$$, $${ H }_{ 2 }$$ and He, respectively is 2:3:Calculate the ratio of their weights present in the container.
  • 2:4:6
  • 16:8:100
  • 16:3:10
  • 4:9:25
Ideal gas equation is also called equation of states because:
  • it depends on states of matter
  • it is relation between four variables and describes the state of any gas
  • it is combination of various gas laws and any variable can be calculated
  • none of these
The vapour pressure of two liquids $$P$$ and $$Q$$ are $$80$$ torr and $$60$$ torr respectively. The total vapour pressure obtained by mixing $$3$$ mole of P and $$2$$ mole of $$Q$$ would be:
  • $$68$$ torr
  • $$20$$ torr
  • $$140$$ torr
  • $$72$$ torr
Volume of a cylinder containing $$10$$ marbles and gas is $$1$$ litre at $$2$$ atm pressure. Now pressure on the cylinder is increased to $$4$$ atm, at which volume becomes $$725$$ ml. Calculate volume of each marble.
  • $$60 \ ml$$
  • $$45 \ ml$$
  • $$57\ ml$$
  • $$39 \ ml$$
The vapour pressure of a pure liquid A is $$70$$ torr at $$27^o$$C. It forms an ideal solution with another liquid B. The mole fraction of B is $$0.2$$ and total vapour pressure of the solution is $$84$$ torr at $$27^o$$C. The vapour pressure of pure liquid B at $$27^o$$C.
  • $$14$$
  • $$56$$
  • $$140$$
  • $$70$$
One mole of $${ N }_{ 2 }{ O }_{ 4 }$$ at 300 K is kept in a closed container under 1 atm pressure. It is heated to 600 K when 20% by mass of $${ N }_{ 2 }{ O }_{ 4 }$$ decomposes to $$'{ NO }_{ 2 }'\left( g \right) $$. The resultant pressure is:
  • 1.2 atm
  • 2.4 atm
  • 2 atm
  • 1 atm
What would be the vapour pressure of 0.5 molal solution of non volatile solute in benzene at $$30^oC$$ ? The vapour pressure of pure benzene at $$30^oC$$ is 119.6 torr.
  • 119.6 torr
  • 121.23 torr
  • 118.52 torr
  • None of these
Calculate the volume occupied by 4 mole of an ideal gas at $$2.5\times { 10 }^{ 5 }{ Nm }^{ -2 }$$ pressure and 300K temperature.
  • $$0.4\ dm^3$$
  • $$0.04\ dm^3$$
  • $$0.3\ dm^3$$
  • None of these
A mixture of $$He$$ and $$SO_2$$ at one bar pressure contains $$20\%$$ by weight of $$He$$. Partial pressure of $$He$$ be:
  • 0.2 bar
  • 0.4 bar
  • 0.6 bar
  • 0.8 bar
The vapour pressure of pure water is 760 mm at $$25^{ 0 }C$$.The vapour pressure of solution containing 1(m) solution of glucose will be:
  • 761.0 mm
  • 746.5 mm
  • 734.5 atm
  • 746.5 Pa
Equal masses of $$SO_2, CH_4$$ and $$O_2$$ are mixed in empty container at $$298$$K, where total pressure is $$2.1$$ atm. The partial pressures of $$CH_4$$ in the mixture is:
  • $$0.5$$ atm
  • $$0.75$$ atm
  • $$1.2$$ atm
  • $$0.6$$ atm
A balloon weighting $$50 Kg$$ is filled with $$ 685 kg$$ of helium at $$1 atm$$ pressure and $${ 25 }^{ o }C$$. What will be its pay load if it displaced $$5108 kg$$ of air?
  • $$4373 kg$$
  • $$4423 kg$$
  • $$5793 kg$$
  • None of these
The Total pressure in a mixture of $$8g$$ of dioxygen and $$4g$$ of dihydrogen confined in a vessel of $$1dm^34$$ at $$27^oC$$ is ?
  • $$R = 83bar\ dm^3k^{-1}mol^{-1}$$
  • $$R = 93bar\ dm^3k^{-1}mol^{-1}$$
  • $$R = 56bar\ dm^3k^{-1}mol^{-1}$$
  • $$R = 63bar\ dm^3k^{-1}mol^{-1}$$
A Solution of non-volatile solute in water freezes at $$-0.{ 30 }^{ }C.$$ The vapour-pressure of pure water at $$298K$$ is $$23.51mm Hg$$ and $${ K }_{ 1 }$$ for water is $$1.86 K. kg { mol }^{ -1 }$$ Calculate the vapour-pressure of this solution at $$298K.$$
  • $$23.4mm$$
  • $$24.8mm$$
  • $$34.8mm$$
  • $$40mm$$
In the following graphical representation for reaction $$A \to B$$ there are two types of regions:
1060028_dcf9e61da667498e89596d8678d33981.png
  • $$I$$ and $$II$$ both represent kinetic region at different interval
  • $$I$$ and $$II$$ both represent equilibrium regions at different time interval
  • $$I$$ represents kinetic while $$II$$ represents equilibrium region
  • $$I$$ represents equilibrium while $$II$$ represents kinetic region
The volume of $$3.7 g $$ of a gas at $${ 25 }^{ o }C$$ is the same as the volume of $$0.184 g$$ of $${ H }_{ 2 }$$ at $${ 17 }^{ o }C$$ and same pressure. What is the molecular weight of the gas?
  • $$31.33 g/mol$$
  • $$41.33 g/mol$$
  • $$21.45 g/mol$$
  • $$11.45g/mol$$
Which of the following gases has the highest density under standard conditions?
  • $$CO$$
  • $$N_2O$$
  • $$C_3H_8$$
  • $$SO_2$$
Air contains $$79\% \ N_2$$ and $$21\% O_2$$ by volume. If the pressure is $$750 \ mm$$ of $$Hg$$, the partial pressure of oxygen $$(O_2)$$ is:
  • $$157.5\ mmHg$$
  • $$175.5\ mmHg$$
  • $$315.0\ mmHg$$
  • $$257.5\ mmHg$$
The measured density at $$NTP$$ of a gaseous sample of a compound was found to be $$1.78\ g/L$$. What is the weight of $$1\ mole$$ of the gaseous sample?
  • $$45.6\ g$$
  • $$39.9\ g$$
  • $$28.25\ g$$
  • None of these
$$2.8 g$$ of a gas at $$1atm$$ and $$273K$$ occupies a volume of $$2.24$$ litres. The gas can not be:
  • $${ O }_{ 2 }$$
  • $$CO$$
  • $${ N }_{ 2 }$$
  • $$C_{ 2 }{ H }_{ 4 }$$
A liquid A and B form an ideal solution. If vapour pressure of pure A and B are $$500N{ m }^{ -2 }$$ and $$200N{ m }^{ -2 }$$ respectively, the vapour pressure of a solution of A and B containing 0.2 mole fraction of A would be:
  • $$700N{ m }^{ -2 }$$
  • $$300N{ m }^{ -2 }$$
  • $$260N{ m }^{ -2 }$$
  • $$140N{ m }^{ -2 }$$
A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of $$290\ mm$$ at $$300\ K$$. The vapour pressure of propyl alcohol is $$200\ mm$$. If the mole fraction of ethyl alcohol is $$0.6$$, its vapour pressure (in $$mm$$) at the same temperature will be:
  • $$300$$
  • $$700$$
  • $$360$$
  • $$350$$
If P is the pressure of gas, then the kinetic energy per unit volume of the gas is:
  • $$P/2$$
  • $$P$$
  • $$3P/2$$
  • $$2P$$
A $$3.00\ L$$ oxygen gas is collected over water at $${27}^{o}C$$ when the barometric pressure is $$787\ Torr$$. If vapour pressure of water is $$27\ Torr$$ at $${27}^{o}C$$, moles of $$O_{2}$$ gas will be?
  • $$0.122$$
  • $$0.126$$
  • $$0.004$$
  • $$0.152$$
A baloon blown up with $$1 $$ mole of gas has a volume of $$480 mL$$ at $$5^oC.$$ the balloon is field to $$(7/8)th$$ of its maximum capacity suggest. The minimum temperature at which it will brust?
  • $$31.4^oC$$
  • $$44.7^o C$$
  • $$49.1^o C $$
  • $$37.6^o C$$
Equal weight of methane and hydrogen are mixed in an empty container at $${ 25 }^{ 0 }C$$. The fraction of total pressure exerted by hydrogen is?
  • 1/2
  • 8/9
  • 16/19
  • 1/9
The surface of a lake is at $$2^{o}C$$ and depth of the lake is $$20\ m$$. Find the temperature of the bottom of the lake?
  • $$552^{o}C$$
  • $$42^{o}C$$
  • $$4^{o}C$$
  • $$825^{o}C$$
A $$4.40\ g$$ piece of solid $$CO_{2}$$ is allowed to subline in a ballon. The final volume of the ballon is $$1.00\ L$$ at $$300\ K$$. What is the pressure of gas?
  • $$0.122$$
  • $$2.46$$
  • $$1.22$$
  • $$24.6$$
The vapour pressure of water at $$20^{o}C$$ is $$17.54mm Hg$$. Then the vapour pressure of the water in the apparatus is lowered, decreasing the volume of the gas above the liquid to one half of its initial volume (temp. constant) is:
  • $$5.77\ mmHg$$
  • $$16\ mmHg$$
  • $$35.08\ mmHg$$
  • between $$8.77$$ and $$15.54\ mmHg$$
For the equilibrium ,$${ 2SO }_{ 3 }(g)\rightleftharpoons 2{ SO }_{ 2 }(g)+{ O }_{ 2 }(g)$$; the partial pressure of $${ SO }_{ 3 }$$, $${ SO }_{ 2 }$$ and $${ O }_{ 2 }$$ gases at $$650 K$$ are respectively $$0.2 bar,0.6 bar$$ and $$0.4 bar$$. If the moles of both oxides of sulphur are so adjusted as equal, what will be the partial pressure of $${ O }_{ 2 }$$?
  • $$4.4$$
  • $$0.44$$
  • $$3.6$$
  • $$1.12$$
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:
  • $$\dfrac{RT}{PM}$$
  • $$\dfrac{P}{RT}$$
  • $$\dfrac{M}{V}$$
  • $$\dfrac{PM}{RT}$$
The volume of $$2.8\ g$$ of carbon monoxide at $$27^{o}C$$ and $$0.821 atm$$ pressure is:
  • $$0.03\ L$$
  • $$3\ L$$
  • $$0.3\ L$$
  • $$1.5\ L$$
$$3$$ moles of $$P$$ and $$2$$ moles of $$Q$$ are mixed, what will be their total vapour pressure in the solution if their partial vapour pressures are $$80$$ and $$60$$ respectively?
  • $$80$$ torr
  • $$140$$ torr
  • $$720$$ torr
  • $$70$$ torr
A quantity of gas is collected in a graduated tube over the mercury. The volume of gas at $${18}^{o}C$$ is $$50.0mL$$ and the level of mercury in the tube is $$100mm$$ above the outside mercury level The barometer reads $$750$$ torr. Hence, volume at STP is approximately:
  • $$22mL$$
  • $$40mL$$
  • $$20mL$$
  • $$44mL$$
Which of the following expression is true regarding gas laws? 
($$w=$$weight, $$m=$$molar mass)
  • $$\dfrac { { T }_{ 1 } }{ { T }_{ 2 } } =\dfrac { { M }_{ 1 }{ w }_{ 2 } }{ { M }_{ 2 }{ w }_{ 1 } }$$
  • $$\dfrac { { T }_{ 1 } }{ { T }_{ 2 } } =\dfrac { { M }_{ 2 }{ w }_{ 1 } }{ { M }_{ 1 }{ w }_{ 2 } }$$
  • $$\dfrac { { T }_{ 1 } }{ { T }_{ 2 } } =\dfrac { { M }_{ 1 }{ w }_{ 1 } }{ { M }_{ 2 }{ w }_{ 2 } }$$
  • $$\dfrac { { T }_{ 2 } }{ { T }_{ 1 } } =\dfrac { { M }_{ 1 }{ w }_{ 1 } }{ { M }_{ 2 }{ w }_{ 2 } }$$
$$4$$ moles $$CO, 5$$ mole $$N_{2}$$ and $$2$$ mole $$C_{2}H_{4}$$ are placed in a $$5$$ litre at $$27^{o}C$$. The ratio of kinetic energy per molecular of $$CO_{2}$$, $$He$$ and $$NH_{3}$$ is:
  • $$4:5:2$$
  • $$5:5:4$$
  • $$2:4:5$$
  • $$1:1:1$$
A gas at a pressure of $$5.0$$ bar is heated from $$0^{o}$$ to $$546^{o}C$$ and is simultaneously compressed to one-third of its original volume. Hence, final pressure is:
  • $$\dfrac {5}{9}$$bar
  • $$15.0$$bar
  • $$30.0$$bar
  • $$45.0$$bar
Which of the following relationships is valid?
  • $$\dfrac {pV}{T}=\dfrac {2}{3}K$$
  • $$\dfrac {pV}{T}=\dfrac {3}{2}K$$
  • $$\dfrac {pV}{T}=2K$$
  • $$\dfrac {pV}{T}=3K$$
Which of the following statement is not a postulate of kinetic molecular theory of gases?
  • $$K.E.$$ is dependent on temperature
  • $$K.E.$$ is dependent on pressure
  • The molecular collisions are perfectly elastic collisions
  • The pressure of the gas is due to collisions of gas molecules on the walls of the vessel
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is $$1:4$$. The ratio of the number of their molecule is _______.
  • $$1:4$$
  • $$7:32$$
  • $$1:8$$
  • $$3:16$$
The mass of glucose that should be dissolved in $$100g$$ water in order to produce same lowering of vapour pressure as produced by dissolving $$1g$$ urea in $$50g$$ of water is?
  • $$1g$$
  • $$2g$$
  • $$6g$$
  • $$12g$$
For which of the following binary solution $${P}_{Total}={P}_{A}^{o}\times {X}_{A}+ {P}_{B}^{o}\times {X}_{B}$$ is followed?
  • Phenol+ Aniline
  • Benzene + Toluene
  • Acetone + Chloroform
  • water + $$HCl$$
How many grams of sucrose must be added to $$320g$$ of water to lower the vapour pressure by $$1.5mm$$ $$Hg$$ at $${25}^{o}C$$?
(Given: The vapour pressure of water at $${25}^{o}C$$ is $$23.8mm$$ $$Hg$$ and molar mass of sucrose is $$324.3g/mol$$)
  • $$21.5g$$
  • $$140g$$
  • $$363.36g$$
  • $$160.12g$$
$$0.157$$ g of a certain gas collected over water occupies a volume of $$135ml$$ at $${ 27 }^{ 0 }C$$ and $$750 mm$$ of Hg. Assuming ideal behaviour , the molecular weight of the gas is: 
(aqueous tension at $${ 27 }^{ 0 }C$$ is $$26.7 mm$$ of $$Hg$$)
  • $$30$$
  • $$32$$
  • $$28$$
  • $$16$$
For  a binary ideal solution, the variation in total vapour pressure versus composition of solution is given by which of the curves?
The vapour pressure of a liquid decreases by $$10 torr$$ when a non-volatile solute is dissolved. The mole fraction of the solute in solution is $$0.1$$. What would be the mole fraction of the liquid if the decrease in vapour pressure is $$20torr$$, the same solute being dissolved?
  • $$0.2$$
  • $$0.9$$
  • $$0.8$$
  • $$0.6$$
Equal masses of $${ SO }_{ 2, }{ CH }_{ 4 }$$ and $${ CH }_{ 4 }$$ are mixed in empty container at 298 K, when total pressure is 2.1 atm. The partial pressure of $$O_2$$ in the mixture is:
  • $$0.5$$ atm
  • $$0.75$$ atm
  • $$1.2$$ atm
  • $$0.6$$ atm
0:0:1


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