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Q.1
The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the __________ law.
Raoult's
Henry's
Amgat's
None of these
Q.2
Heat of reaction is not influenced by
The route/method through which final products are obtained
The physical state (e.g., solid, liquid or gaseous) of reactants and products
Whether the reaction is carried out at constant temperature or constant pressure
None of these
Q.3
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules
Do not lose energy on collision
Are above the inversion temperature
Do not exert attractive force on each other
Do work equal to loss in kinetic energy
Q.4
One Newton is equal to __________ dynes.
10²
10³
10⁴
10⁵
Q.5
Pick out the wrong statement.
'Reduced temperature' of a substance is the ratio of its existing temperature to its critical temperature, both expressed on celsius scale
'Reduced pressure' is the ratio of the existing pressure of a substance to its critical pressure
'Reduced volume' is the ratio of the existing molal volume of a substance to its critical molal volume
None of these
Q.6
The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg.?
0.2
0.1
0.4
0.6
Q.7
The density of a liquid is 1500 kg/m³. Its value in gin/litre will be equal to
1.5
15
150
1500
Q.8
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°
298
= - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about
0.19
0.33
0.40
0.67
Q.9
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water X
w
in the vapour phase satisfies
0 < X
w
< 0.5
X
w
= 0.5
0.5 < X
w
< 1.0
X
w
= 1.0
Q.10
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour
Measures the elevation in boiling point
Is not dependent on the temperature
Is a function of the liquid phase composition
Measures the depression in freezing point
Q.11
An ideal gas can be liquified, because
Its molecular size is very small
Its critical temperature is more than 0°C
Forces operative between its molecules are negligible
It gets solidified directly without becoming liquid
Q.12
A bypass stream in a chemical process is useful, because it
Facilitates better control of the process
Improves the conversion
Increases the yield of products
None of these
Q.13
An equation for calculating vapour pressure is given by, log
10
P = A - B(t + c). This is called the
Kistyakowsky equation
Antonic equation
Kopp's rule
Trouton's rule
Q.14
2 litres of nitrogen at N.T.P. weighs __________ gms.
14
2.5
28
1.25
Q.15
Heat of transition is the heat evolved or absorbed, when a substance is converted from
Vapor to liquid
Vapor to solid
Solid to liquid
One allotropic form to another allotropic form
Q.16
Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature?
Chlorine
Nitrogen
Ethane
All of the above
Q.17
The value of the gas-law constant 'R' is 1.987
Kcal/kg-mole.°C
Btu/lb-mole.°R
Kcal/kg-mole.°K
Both B & C
Q.18
The combustion equations of carbon and carbon monoxide are as follows:
C + O₂ = CO₂, ΔH = - 394 kJ/kg . mole CO + 1/2 O₂ = CO₂, ΔH = - 284.5 kJ/kg. mole.
The heat of formation of CO is __________ kJ/kg. mole.
-109.5
+109.5
+180
+100
Q.19
In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the
Solute concentration
Temperature
Both A & B
Neither A nor B
Q.20
__________ fuels require the maximum percentage of 'excess air' for complete combustion.
Solid
Liquid
Gaseous
Nuclear
Q.21
Atomic __________ of an element is a whole number.
Weight
Number
Volume
Radius
Q.22
If pH value of a solution is 8, then its pOH value will be
6
1
7
10
Q.23
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)
350
485
140
345
Q.24
Density of carbon dioxide is __________ kg/Nm³.
44/22400
44/22.4
22.4/44
None of these
Q.25
Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of
Mixing
Adsorption
Wetting
Complete wetting
Q.26
A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal
Kinetic energy
Intermolecular forces of attraction
Potential energy
Total energy
Q.27
The vapour pressure of water is given by, in P
sat
= A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately
0.07
0.09
0.11
0.13
Q.28
Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
Same elevation in boiling point
Different elevation in boiling point
Elevation in boiling point in the ratio of their molecular weights
None of these
Q.29
For estimation of heat capacity of a solid compound, one can use
Clayperon's equation
Gibb's equation
Kopp's rule
Trouton's rule
Q.30
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.
Potential energy
Intermolecular forces
Kinetic energy
Total energy
Q.31
The total number of atoms in 8.5 gm of NH₃ is __________ x 10
23
.
9.03
3.01
1.204
6.02
Q.32
Which of the following holds good for a solution obeying Raoult's law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing ) ?
ΔH = 1 (+ ve)and Δ V = -ve
ΔH = 0
ΔV = 0
Both B and C
Q.33
Dissolving a solute in a solvent does not change its
Specific heat
Vapour pressure
Viscosity
None of these
Q.34
Pick out the wrong statement.
The effect of pressure on heat capacity of gases at pressure above one atmosphere and above the critical temperature is negligible
The value of C
p
of gases increases with increase in pressure, above atmospheric pressure
The value of C
p
at critical temperature and pressure reaches infinity
All of the above
Q.35
Number of gm moles of solute dissolved in 1 kg of solvent is called its
Normality
Molarity
Molality
Formality
Q.36
Avogadro's number is equal to
Q.37
Enthalpy of a vapor gas mixture may be increased by increasing the
Temperature at constant humidity
Humidity at constant temperature
Temperature and the humidity
All of the above
Q.38
The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the
Nature of both the gas & the liquid
Temperature
Total pressure
None of these
Q.39
Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the
Nature of the liquid
Nature of the gas
Temperature of the liquid
Total pressure
Q.40
Elements in a periodic table are arranged in order of their
Atomic number
Mass number
Atomic weight
Metallic characteristics
Q.41
For an ideal gas, the compressibility factor
Decreases with pressure rise
Is unity at all temperature
Is unity at Boyle's temperature
Zero
Q.42
C
v
for monoatomic gases is equal to(where, R = gas constant)
R
1.5 R
2R
3R
Q.43
The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the
Phase rule
Experimental data
Emperical equations
Theoretical equations
Q.44
What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively?
756.2
780.5
801.5
880.5
Q.45
In osmosis through a semi-permeable membrane, diffusion of the
Solvent is from low concentration to high concentration region
Solvent is from high concentration to low concentration region
Solute takes place
None of these
Q.46
Isotonic solutions must have the same
Viscosity
Molar concentration
Normality
Critical temperature
Q.47
The heat capacity of most substances is greater for the __________ state.
Solid
Liquid
Gaseous
None of these
Q.48
Addition of a non-volatile solute to a pure solvent
Increases its freezing point
Increases its boiling point
Decreases its freezing point
Both B and C
Q.49
The effect of pressure on the heat capacity of the gases __________ is negligible.
At pressure below one atmosphere
Below the critical temperature
Both A & B
Neither A nor B
Q.50
Gases diffuse faster compared to liquids because of the reason that the liquid molecules
Are held together by stronger inter-molecular forces
Move faster
Have no definite shape
Are heavier
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