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CBSE Questions for Class 11 Engineering Chemistry States Of Matter Quiz 9 - MCQExams.com

Which of the following represents the Avogadro number?
  • Number of molecule present in 1 L of gas at N.T.P
  • Number of molecule present in 22.4 L of gas at N.T.P
  • Number of molecule present in 22.4 of gas at 298K and 1 atm pressure
  • Number of molecule present in one mole of gas at any temp and pressure
At 250oC and 1 atmosphere pressure, the vapour density of PCI5 is 57.9 . What will be the dissociation of PCI5
  • 1.00
  • 0.90
  • 0.80
  • 0.65
Which of the following is an anti-knocking compound, that has been phased out in many countries so far?
  • Lead tetrachloride
  • Tetra Ethyl Lead
  • Ethyl tetrachloride
  • None of these
One gram molecule of any gas at NTP occupies 22.4 L. This fact was derived from:
  • Dalton's theory
  • Avogardro's hypothesis
  • Berzelius hypothesis
  • Law of gaseous volume
At 300 K, the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen(N2) at 4 bar.The molar mass of gaseous molecule is:
  • 224gmol1
  • 112gmol1
  • 56gmol1
  • 28gmol1
Thermometer (A) and (B) have ice points marked at 15oC & 25oC and steam points at 75oC & 125oC respectively. When thermometer A measures the temperature of a bath as 60oC the reading of B for the same bath is :
  • 60oC
  • 75oC
  • 90oC
  • 100oC
If there unreactive gases having partial pressure PA,PB and PC and there moles are 1,2 and 3  respectively then their total pressure will be : 
  • P=PA+PB+PC
  • P=PA+PB+PC6
  • P=PA+PB+PC3
  • None of these
A container has SO2 gas at 2 atm pressure in a vessel of V L capacity, if no. of moles of SO2 are doubled in the same container at the same temperature and volume. Calculate new pressure in the container.
  • 1 atm
  • 4 atm
  • 2 atm
  • 8 atm
A solution X of A and B contains 30 mole % of A & is in equilibrium with its vapour that contains 40 mole % of B. The ratio of V.P of pure, A and B will be?
  • 2:7
  • 7:2
  • 3:4
  • 4:3
The vapour pressure of water at 200C is 17.54 mm. When 20 g of non-ionic, substance is dissolved in 100 g of water, the vapour pressure is lowered by 0.30 mm.What is the molecular weight of the substances.
  • 210.2
  • 208.16
  • 215.2
  • 200.8
Consider the following statements
a. Kinetic energy of a molecule is zero at 00C.
b. A gas in a  closed container will exert much higher pressure due to gravity at the bottom than at the top 
c. Between collisions, the molecules move in straight lines with constant velocities.
Choose the incorrect statement(s)
  • a, b & c
  • a & b
  • b & c
  • a & c
At 270C a gas is compressed to half of its volume.To what temperature it must now be heated at constant pressure so that gas occupies just its original volume?
  • 540C
  • 6000C
  • 3270C
  • 327K
The sample of neon gas heated from 300 K to 390 K, percentage increases in K.E is:
  • 10\%
  • 20\%
  • 30\%
  • 40\%
273 ml of a gas at STP was taken to 27^oC and 600 mm pressure. The final volume of the gas would be:
  • 273 mL
  • 300 mL
  • 380 mL
  • 586 mL
Equal amounts of two gases of molecular mass 4 and 40 are mixed. the pressure of the mixture is 1.1 atm. The partial pressure of the light gas in this mixture is :
  • 0.55 atm
  • 0.11 atm,
  • 1 atm
  • o.12 atm
Mole fraction of A vapours above the solution in mixture of A and B (X_A=0.4)will be 
[Given : { P }_{ A }^{ 0 }=100mmHg\quad and\quad { P }_{ B }^{ 0 }=200mmHg]
  • 0.4
  • 0.8
  • 0.25
  • none of these
6 g of urea is dissolved in 90 g of boiling water.The vapour preasure of the solution is:
  • 744.8 mm
  • 758 mm
  • 761 mm
  • 760 mm
A constant gas temperature is based on
  • Archimedes prinviple
  • Pascal laW
  • Boyle's law
  • Charles's law
The relative lowering of vapour pressure of a solution containing 6\ g of urea dissloved in 90\ g of water is
  • 0.0196
  • 0.05
  • 1.50
  • 0.01
Which of the following sets of variables give a staright line with negative slope when plotted ?
( P = Vapour pressure ; T = Temperature in K)
y- axis x -axis y -axis x-axis
  • P\quad \quad \quad T
  • log_{10}P\quad \quad \quad T
  • log_{10}P\quad \quad \quad \frac{1}{T}
  • log_{10}P \quad \quad \quad log_{10} \frac{1}{T}
The vapour pressure of two liquids are 15000 and 30000 in a unit. When equimolar solution of liquids is.. The the mole fraction of A and B in vapour phase will be:
  • \dfrac{2}{3}, \dfrac{1}{3}
  • \dfrac{1}{3}, \dfrac{2}{3}
  • \dfrac{1}{2}, \dfrac{1}{2}
  • \dfrac{1}{4}, \dfrac{3}{4}
When the temperature of 23ml of dry CO_{2} gas is changed from 10^\circ to 30^\circ at constant pressure of 760 mm, the volume of gas becomes closest to which one of the following?
  • 7.7 ml
  • 21.5 ml
  • 24.6 ml
  • 69 ml
The reflective lowering of sapour pressure of a solution containing 6\ g of urea dissolved in 90\ g of water is ?
  • 0.0196
  • 0.05
  • 1.50
  • 0.01
A 15.0 L cylinder of He gas is connected to an evacuated 235.0 L tank.If the final pressure is 750 mm Hg, then what have been the original gas pressure in the cylinder? 
  • 1.645 atm
  • 16.45 atm
  • 15.46 atm
  • 23 atm
Which of the following gas mixture is not applicable for Dalton's law of particle pressure?
  • SO_2 and Cl_2
  • CO_2 and N_2
  • CO and CO_2
  • CO and N_2
The value of gas constant per mole is approximately-
  • 1\ cal
  • 2\ cal
  • 3\ cal
  • 4\ cal
The vapour pressure of a solution at 100^{o}C containing 3\ g of cane sugar in 70\ g of water? (vapour pressure of water at 100^{o}C=760\ mm of Hg) is)  
  • 758\ mm of Hg
  • 730.36\ mm of Hg
  • 400\ mm of Hg
  • 700\ mm of Hg
A pin or a needle floats on the surface of water, the reason for this is 
  • Surface tension
  • Less weight
  • upthrust of liquid
  • None of the above
Rain drops acquire spherical shape due to 
  • viscosity
  • surface tension
  • friction
  • elasticity
Which is not correct in terms of kinetic theory of gases-
  • Gases are made up of small particles called molecules
  • The molecules are in random motion
  • When molecules collide, they lose energy
  • When the gas is heated, the molecules moves faster
Small liquid drops assume spherical shape because 
  • atmospheric pressure exerts a force on liquid drop
  • volume of a spherical drop is minimum
  • gravitational force acts upon the drop
  • liquid tends to have the minimum surface are due to surface tension
A box of 1L capacity is divided into two equal compartments by a thin partition which are filled with 2 g\ \mathrm { H } _ { 2 } \text { and } 16 \mathrm { g } \ \mathrm { CH } _ { 4 } respectively. The pressure in each compartment is recorded as P atm. The total pressure when partition is removed will be: 
  • P
  • 2P
  • P/2
  • P/4
The water proofing agents
  • Increase T and decrease \theta
  • Increase both T and \theta
  • Decrease both T and \theta
  • Decrease T and increase \theta
The vapour pressure of pure CHCl_{3} and CH_{2}Cl_{2} are 200 and 41.5\ atm respectively. The weight of CHCl_{3} and CH_{2}Cl_{2} are respectively 11.9\ g and 17\ gm. The vapour pressure of solution will be
  • 80.5
  • 79.5
  • 94.3
  • 105.5
A pre-weighed vessel was filled with oxygen at NTP and weighed. It was then evacuated, filled with SO_{2} at the same temperature and pressure and again weighed. The weight of oxygen is ______________.
  • the same as that of SO_{2}
  • \dfrac{1}{2} that of SO_{2}
  • twice that of SO_{2}
  • \dfrac{1}{4} that of SO_{2}
If water vapor comprises 3.5 percent of an air parcel whose total pressure is 1,000 mb, the water vapor pressure would be:
  • 1,035 mb
  • 35 mb
  • 350 mb
  • 965 mb
If RMS velocity of gaseous molecules is x cm/s at a pressure of P atm then RMS velocity at a pressure of 2p atm at constant temperature will be:
  • x
  • 2x
  • 4x
  • x/4
The vapour pressure of pure M and N are 700mm of Hg and 450 mm of Hg respectively.which of the following option is correct?
Given :X_N,X_M- mole fraction of N and M in liquid phase
Y_N,Y_M= mole fraction of N and M in vapour phase.
  • X_M-X_N>Y_M-Y_N
  • \dfrac{X_M}{X_N}>\dfrac{Y_M}{Y_N}
  • \dfrac{X_M}{X_N}<\dfrac{Y_M}{Y_N}
  • \dfrac{X_M}{X_N}=\dfrac{Y_M}{Y_N}
The volume of a gas is held constant while its temperature is raised. The pressure of the gas exerts on the walls of the container increases because:
  • The masses of the molecules increases
  • Each molecule loses more kinetic energy when it strikes the wall
  • The molecules collide with the wall with relatively greater momentum
  • The molecules strikes the walls more often
On increasing the altitude at constant temperature, vapour pressure of liquid 
  • increases
  • decreases
  • remains the same
  • depends upon climate
A pre-weighted vessel was filled with oxygen at NTP and weighted. It was then evacuated, filled with SO_2 at the same temperature and pressure and again weighted. The weight of oxygen will be:
  • the same as that of SO_2
  • 1/2 that of SO_2
  • twice that of SO_2
  • 1/4 that of SO_2
A closed vessel contains equal number of nitrogen and oxygen molecules at a pressure of p\ mm. If nitrogen is removed from the system then the pressure will be:
  • p
  • 2p
  • p/2
  • p^2
Equal weights of methane and hydrogen are mixed in an empty container at 25^oC. The fraction of the total pressure exerted by hydrogen is
  • 1/2
  • 8/9
  • 1/9
  • 16/17
With regard to the gaseous state of matter which of the following statements are correct?
  • Complete order of molecules
  • Complete disorder of molecules
  • Random motion of molecules
  • Fixed position of molecules
In the ideal gas equation, the gas constant R has the dimensions of:
  • mole-atm \ K
  • litre \ mole
  • litre-atm \ K- mole
  • erg \ K
The translational kinetic energy of an ideal gas depends only on its:
  • Pressure
  • Force
  • Temperature
  • Molar mass
Kinetic energy of a gas depends upon its:
  • Molecular mass
  • Atomic mass
  • Equivalent mass
  • None of these
For a solution formed by mixing liquids L and M, the vapour pressure of L plotted against the mole fraction of M in solution is shown in the following figure. Here x_L and x_M represent mole fractions of L and M respectively in the solution. The correct statement \left(s\right) applicable to this system is \left(are\right) 
1738334_d5ab26a454f94a8b80419fda76ce4639.png
  • The point Z represents vapour pressure of pure liquid M and Raoults law is obeyed from X_{L}=0 to X_{L}=1.
  • Attractive intermolecular interactions between L-L in pure liquid L and M - M in pure liquid M are stronger than those between L - M when mixed in solution.
  • The point Z represents vapour pressure of pure liquid M and Raoults law is obeyed when X_L \to 0.
  • The point Z represents vapour pressure of pure liquid L and Raoults law is obeyed when X_L\to 1
\Delta_f G^{\circ} at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcal mol^{-1} respectively. Vapour pressure of liquid 'S'' at 500 K is approximately equal to: 

R = 2 cal K^{-1} mol^{-1}
  • 10 atm
  • 0.1 atm
  • 1 atm
  • 100 atm
The type of molecular force of attraction present in the following compound is :
1818022_88b5187a8a9b42eba73d138b05d6eea1.PNG
  • Intermolecular H-bonding
  • Intramolecular H-bonding
  • van der WaaLs' force
  • All of these
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