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CBSE Questions for Class 11 Engineering Chemistry States Of Matter Quiz 13 - MCQExams.com

The solubility of a specific non-volatile salt is 4g in 100 g of water at 250C. If 2.0g, 4.0g and 6.0g of the salt added of 100g of water at 250C, in system X, Y and Z. The vapour pressure would be in the order:
  • Z>Y>X
  • X>Y>Z
  • Z>X=Y
  • X>Y=Z
The pressure exerted by a mass of x mg resting on the area of 1.00 cm2 is 1.00 Pa, then x is
  • 10.6
  • 10.3
  • 103
  • 10.2
According to kinetic theory of gases :
  • collisions are always elastic
  • between collisions, the molecules move in straight lines with constant velocities
  • only a small number of molecules have a very high velocity
  • at of the above
200 ml of He at 0.66 atm pressure and 400 ml of O2 at 0.52 atm pressure are mixed in a 400 ml vessel at 25C. The partial pressure of He and  O2 will be:
  • 0.33 and 0.56
  • 0.33 and 0.52
  • 0.38 and 0.56
  • 0.25 and 0.45
The reduction potential of hydrogen electrode will be positive if 
  • PH2=2atm;[H+]=1M
  • PH2=2.5atm;[H+]=1.5M
  • PH2=2.5atm;[H+]=1M
  • PH2=1atm;[H+]=2M
The vapour pressure of pure water at 25C is 30 mm. The vapour pressure of 10% (W/W) glucose  solution at 25C is :
  • 31.5 mm
  • 30.6 mm
  • 29.67 mm
  • 26.56 mm
A reaction follows the given concentration (M)- time graph. The rate for the reaction at 20 seconds will be
1182476_9ec368e9033747469f0e8f612103d38c.jpg
  • 410 MS
  • 810 MS
  • 210 MS
  • 710 MS
5.40 gm of an unknown gas at 27oC occupies the same volume as 0.14 gm of hydrogen at 17oC and same pressure. The molecular weight of unknown gas is 
  • 79.8
  • 81
  • 79.2
  • 83
At point P and Q,the real gas deviation with respect to ideal gas is respectively 
1199324_e20da8cd0975400eaf2bedf5ba3abc23.PNG
  • Positive,negative
  • Positive, positive
  • Negative,Positive
  • Negative,Negative
The vapour pressure of pure benzene at a certain temperature is 200 mm Hg. At the same temperature the vapour pressure of a solution containing 2 g of non volatile non electrolyte solid in 78 g of benzene is 195 mm Hg. What is the molecular mass of solid?
  • 50
  • 70
  • 85
  • 80
n moles of Helium gas are placed in a vessel of volume V Litre. At T K, if V1 is free volume of Helium then diameter of He atom is 
  • [32V1πNAn]1/3
  • [32(VV1)πNAn]1/3
  • [6(VV1)πNAn]1/3
  • [6V1πNAn]1/3
Consider a binary mixture of volatile liquids. If at XA=0.4 the vapour pressure of solution is 580 torr then the mixture could be (p0A=300 torr,p0B=800 torr)
  • CHCl3CH3COCH3
  • C6H5ClC6H5Br
  • C6H6C6H5CH3
  • nC6H14nC7H16
The ratio of densities of a gas at two conditions of temperature and pressure is given by:
  • ρ2ρ1=(p2p1)(T2T1)
  • ρ2ρ1=(p2p1)(T1T2)
  • ρ2ρ1=(p1p2)(T1T2)
  • ρ2ρ1=(p1p2)(T2T1)
Calculate solubility (in moles / litre) of a saturated aqueous solution of Ag3PO4 if the vapour pressure of the solution becomes 750 torr at 373 K
(Assume molality=molarity).
  • 2/15
  • 1/30
  • 10/54
  • 20/27
18 g of glucose (C6H12O6) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 100C is ?
  • 7.60 Torr
  • 76.00 Torr
  • 752.40 Torr
  • 759.00 Torr
Gay Lussac's law is not valid for which chemical reaction?
  • 2NO(g)+O2(g)2NO2(g)
  • 2HI(g)H2(g)+I2(g)
  • 4B(s)+3O2(g)2B2O3(s)
  • 2SO2(g)+O2(g)2SO3(g)
Which of the following attraction is strongest? 
Liquids A and B form an ideal solution. At 30o C, the total vapour pressure of a solution containing 1 mol of A and 2 mols of B is 250 mm Hg. The total vapour pressure becomes 300 mm Hg when 1 more mol of A is added to the first solution. The vapour pressures of pure A and B at the same temperature are 
  • 450,150 mm Hg
  • 150,450 mm Hg
  • 250,300 mm Hg
  • 125,150 mm Hg
The equilibrium constant for the following equilibrium is given at 00C:

Na2HPO4.12H2O(s)Na2HPO4.7H2O(s)+5H2O(g);Kp=31.25×1013

The vapor pressure of water is:
  • 2×104atm
  • 5×104atm
  • 5×102atm
  • 5×103atm
An ideal gas is compressed in a closed container its U?
  • Increases
  • Decreases
  • Remains same
  • Both (1) & (2)
45.4 L of dinitrogen reacted with 22.7 L of dioxygen and 45.4 L of nitrous oxide was formed. The reaction is given below : 
2N2(g)+O2(g)..2N2O(g)
Which law is being obeyed in this experiment?
  • Gay Lussac's law
  • Law of definite proportion
  • Law of multiple proportion
  • Avogadro's law
Which of the following mixture of gases does obey Dalton's Law of partial pressure ?
  • Cl2 and SO2
  • CO2 and He
  • O2 and CO2
  • N2 and O2
A mixture of 50.ml of NH3 and 60.0 ml of O2 gas react as
4NH3(g)+5O2(g)4NO+6H2O(g)
If all the gases are at the same temperature and the reaction continues until one of the gases is completely consumed, what volume of water vapour is produced?
  • 48 mL
  • 60.0mL
  • 72 mL
  • 75.0 mL
Two liquids A and B have PA0:PB0 = 1:3 at a certain temperature. If the mole fraction ratio  xA:xB= 1:3, the mole fraction of A in vapour in equilibrium with the solution at the given temperature is -        
  • 0.1
  • 0.2
  • 0.5
  • 1.0
Calculate the mass of a non - volatile solute (molar  mass 40gmol1) which should be dissolved in 114g octane to reduce its vapour pressure to 80%
  • 2g
  • 4g
  • 8g
  • 10g
Initial temperature of an ideal gas is 75oC . At what temperature, the sample of neon gas would be heated to double its pressure, if the initial volume of gas is reduced by 15%?
  • 319oC
  • 592oC
  • 128oC
  • 60oC
Which of the following solutions will have the lowest vapour pressure?
  • 0.1M Glucose
  • 0.1M NaCl
  • 0.1M BaCl2
  • 0.1MAl2(SO4)3
At 40C the vapour pressure ( in torr ) of a mixture of methyl alcohol and ethyl alcohol is represented by P=199x+135
(where x is the mole fraction of methyl alcohol) 
What are the vapour pressures of pure methyl alcohol and pure ethyl alcohol at 40C ?
  • 135 and 254 torr
  • 119 and 135 tor
  • 119 and 254 torr
  • 334 and 135 torr
Vapour Pressure of methyl alcohol and ethyl alcohol solution is represented by P=115xA+140. Where xA is the mole fraction of methyl alcohol. The value of limxA0P0BxB
  • 255
  • 115
  • 140
  • 135
Calculate the vapour pressure of aqueous 0.1 m glucose solution at 300 K temperature, the vapour pressure of water is 0.03 bar at 300 K temperature.
  • 0.5 bar
  • 0.29 bar
  • 0.3 bar
  • 0.03 bar
5.0 L water placed in a closed room of volume 2.5×104L having temperature 300 K. If vapour pressure of water is 27.0 mm and density is 0.990 g/cm3 at this temperature, how much water is left in liquid state?  
  • 3.444 L
  • 4.344 L
  • 4.798 L
  • 1.212 L
At a certain temperature pure liquid A and liquid B have vapour pressures 10 torr and 37 torr respectively. For a certain ideal solution of A and B, the vapour in equilibrium with the liquid has the components A and B in the partial pressure ratio PA:PB=1:7. What is the mole fraction of A in the solution? 
  • 0.346
  • 0.654
  • 0.5
  • None of these
The energy of absorbed by each molecule (A2) of a substance is 4.4×1019J and bond energy per molecule is 4.0×1019J. The kinetic energy of the molecule per atom will be 
  • 2.2×1019J
  • 2.0×1019J
  • 4.0×1020J
  • 2.0×1020J
Vapour pressure increase with increase in : 
  • Concentration of solution containing non-volatile soulute
  • Temperature up to boiling point
  • Temperature upto triple point
  • Altitude of the concerned place of boiling
The vapour pressure of the solution of 5g on non-electrolyte in 100g of water at a particular temperature is 2950N/m2. The vapour pressure of water is 3000N/m2. The mocular mass of the solute is ?
  • 54
  • 124
  • 180
  • 340
The kinetic energy of two moles of N2 at 27oC is (R=8.314 JK1mol1)
  • 5491.6 J
  • 6491.6 J
  • 7482.6 J
  • 8882.4 J
The mass of a non-volatile non-electrolyte solute (molar mass=50 g mol1) needed to be dissolved in 114 g octane to reduce its vapour pressure to 75% is:
  • 37.5 g
  • 75 g
  • 150 g
  • 50 g
At a certain temperature, the vapour pressure of water is 50 mm. The relative lowering of vapour pressure of a solution containing 36 g of glucose in 900 g of water is
  • 0.1
  • 0.5
  • 0.004
  • 3.75
The vapour pressure of 1 molal glucose solution at 100oC will be 
  • 760 mmHg
  • 76.0 mmHg
  • 1 atm
  • 746.32 mmHg
0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a a container of volume 10m3 at 1000 K. Given R is the gas constant in JK1 mol1, x is:
  • 2R4+12
  • 2R412
  • 4R2R
  • 4+R2R
When a solution containing non-volatile solute is diluted with water,
  • its vapour pressure increases
  • its osmotic pressure increases
  • its boiling point increases
  • its freezing point increases
An ideal solution formed by mixing two liquids  'A' and 'B' find the pressure at which XA=YB (PA0=400 torr,PB0=100torr) 

(XA and YB are mole fraction of A and B in liquid and vapour forms respectively at equilibrium.)
  • 250 torr
  • 200 torr
  • 150 torr
  • 125 torr
At 35oC, the vapour pressure of CS2 is 512mm Hg, and acetone is 344mm Hg. A solution of CS2 and acetone in, which the mol fraction of CS2 is 0.25, has a total vapour pressure of 600mm Hg. Which of the following statements is/are correct:
  • A mixture of 100mL of acetone and 100mL CS2 of has a volume is 200mL
  • When acetone and CS2 are mixed at 35oC, heat must be absorbed in order to produce a solution at 35oC
  • When acetone and CS2 are mixed at 35oC, heat is released
  • There is negative deviation from Raoult's law
Vapour pressure of pure 'A' is 70 mm of Hg at 250C it forms an ideal solution is with 'B' in which mole fraction of A is 0.If the vapour pressure of the solution is 84 mm is Hg at 250C, the vapour pressure of pure 'B' at 250C is :
  • 56 mm Hg
  • 70 mm Hg
  • 140 mm Hg
  • 28 mm Hg
A solution is prepared by mixing 8.5g of CH2Cl2 and 11.95g of CHCl3. If vapour pressure of CH2Cl2 and CHCl3 at 298K are 415 and 200mm Hg respecetively, then mole fraction of CHCl3 in vapour form is:
  • 0.162
  • 0.675
  • 0.325
  • 0.486

Two liquids A and B form ideal solution.At 300K,the vapour pressure of solution containing 1 mol of A and 3 mol of B is 550mm Hg.At the same temperature,if one more mole of B is added to this solution,the vapour pressure of the solution increases by 10mm Hg.Determine the vapour pressures of A and B in their pure states.

  • 563 and 469
  • 500 adn 1250
  • 513 and 494
  • 400 and 600
The volume occupied by 4.4 gram  of CO2 at STP is 
  • 2.85 liter
  • 2.24 liter
  • 2.6 liter
  • 2.64 liter
At 80oC, the vapour pressure of pure liquid A is 520 mm Hg and that of pure liquid B is 1000 mm Hg. If a mixture solution of A and B boils at 80oCand 1 atm pressure, the amount of A in the mixture is :
(1 atm=760 mm Hg)
  • 34 mol%
  • 48 mol%
  • 50 mol%
  • 52mol%
The kinetic energy of 1 mole of gas is equal to-
  • 32RT
  • 32KT
  • RT2
  • 2R3
Pressure exerted by 2 grams of helium present in a vessel is 1.5 atm. If 4 grams of gas 'X' is introduced into the same vessel keeping the condition constant, the pressure is 2.25 atm. Gas 'x' is  
  • hydrogen
  • methane
  • oxygen
  • soldier oxide
0:0:1


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