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Quiz 1
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Q.1
The vapor pressure of a substance, at its melting point, is __________ in the solid state as compared to that in the liquid state.
Less
More
Same
Either A or B; depends on the nature of the substance
Q.2
If the absolute temperature of an ideal gas is tripled and simultaneously the pressure is reduced to one third; then the volume of gas will
Remain unaltered
Increase nine fold
Increase three fold
Decrease three fold
Q.3
For most salts, the solubility increases with rise in temperature, but the solubility of __________ is nearly independent of temperature rise.
Sodium chloride
Sodium carbonate monohydrate
Anhydrous sodium sulphate
Hypo
Q.4
Dry air is a mixture of
Vapors
Gases
Both A & B
Neither A nor B
Q.5
A reduction process is accompanied with increase in the
Number of electrons
Oxidation number
Both A & B
Neither A nor B
Q.6
In physical adsorption, as compared to chemisorption, the
Quantity adsorbed per unit mass is higher
Rate of adsorption is controlled by the resistance to surface reaction
Activation energy is very high
Heat of adsorption is very large
Q.7
The rate of material __________ is zero in case of a steady state system.
Accumulation
Production
Input
Generation
Q.8
Volume percent for gases is equal to the
Weight percent
Mole percent
Weight percent only for ideal gases
Mole percent only for ideal gases
Q.9
The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the
Relative humidity
Relative saturation
Percentage saturation
None of these
Q.10
Pick out the wrong unit conversion of calorific value.
1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
1 BTU/ft³ = 8.9 kcal/m³ = 0.038 MJ/m³
1 BTU/lb = 2.3 kcal/kg
1 kcal/m³ = 0.1124 BTU/ft³
Q.11
What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?
2/3
1/3
1/2
L/3 x 298/273
Q.12
Kopp's rule is concerned with the calculation of
Thermal conductivity
Heat capacity
Viscosity
Surface tension
Q.13
Pick out the wrong statement.
Ten times dilution of a normal solution (N) reduces its normality to N/10
When equal weights of oxygen and methane are mixed in an empty reactor at room temperature, then the fraction of total pressure exerted by the oxygen is 1/2
Volume occupied by 9.034 x 10
23
atoms of oxygen in ozone (O₃) at NTP will be 11200 c.c
One kg mole of an ideal gas at N.T.P occupies 22400 Nm³
Q.14
For any system, the __________ heat of solution is dependent on the temperature and the adsorbate concentration.
Integral
Differential
Both A & B
Neither A nor B
Q.15
Pick out the correct conversion.
1 BTU =453.6 calories
1 BTU = 252 calories
1 calorie = 252 BTU
1 calorie = 453.6 BTU
Q.16
1 Pascal (unit of pressure) is equal to __________ N/m².
10
1
0.1
1000
Q.17
The unit of specific heat at constant pressure, C
p
, in SI unit is
W/m²°C
J/kg°K
W/m°K
J/m³°K
Q.18
If the pH value of a solution changes by one unit, it implies that hydrogen ion concentration in the solution will change __________ times.
10
20
70
100
Q.19
The atomic heat capacities of all solid elements __________ with decrease in temperature.
Increases
Decreases
Remains unchanged
Approach zero at 0°C
Q.20
The OH⁻ concentration in a solution having pH value 3 is
10
-3
10
-10
10
-11
10
-13
Q.21
The viscosity of water at room temperature may be around one
Centipoise
Poise
Stoke
Both B & C
Q.22
Which of the following is not a unit of kinematic viscosity?
Poise
Stoke
Cm²/second
None of these
Q.23
The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be
2M
M/2
M
M/4
Q.24
C
p
- C
v
, for an ideal gas is equal to
R
R/2
2R
3R
Q.25
With increase in temperature, the surface tension of water
Increases
Decreases
Remains constant
Increases linearly
Q.26
At higher temperature, molal heat capacities of most of the gases (at constant pressure) __________ with increase in temperature.
Increases
Decreases
Remains unchanged
Increases linearly
Q.27
At higher temperatures, molal heat capacities for most of the gases (at constant pressure) __________ with increase in temperature.
Varies linearly
Increases
Decreases
Does not vary
Q.28
A vapor that exists above its critical temperature is termed as a __________ vapor.
Saturated
Unsaturated
Gaseous
Sub-cooled
Q.29
A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be
0°C
0°K
-136.5°C
-136.5°K
Q.30
Pick out the wrong statement.
Heat capacity of a diatomic gas is higher than that of a monoatomic gas
Equal volumes of Argon and Krypton contain equal number of atoms
Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 10
23
The binary mixture of a particular com-positidn in both vapor and liquid state is known as an azeotropic mixture
Q.31
Ideal solution is formed, when its components have zero
Heat of mixing
Volume change
Both A & B
Neither A nor B
Q.32
Kinetic theory of gases stipulates that, the
Energy is lost during molecular collisions
Molecules possess appreciable volume
Absolute temperature is a measure of the kinetic energy of molecules
None of these
Q.33
At what temperature, given mass of a gas that occupies a volume of 2 litres at N.T.P. will occupy a volume of 4 litres, if the pressure of the gas is kept constant?
273°C
273°K
100°C
200°C
Q.34
The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed.
6680
13360
2481
97302
Q.35
The heat change for the reaction, C(s) + 2S(s) → CS₂(l), is 104.2 kJ. It represents the heat of
Formation
Solution
Combustion
Fusion
Q.36
Which of the following ratios defines the recycle ratio in a chemical process?
Gross feed stream/recycle feed stream
Recycle stream/fresh feed stream
Recycle stream/gross feed stream
None of these
Q.37
Heat of reaction is a function of the
Pressure
Temperature
Both(a)&(b)
Neither (a) nor (b)
Q.38
The temperature of a gas in a closed container is 27° C. If the temperature of the gas is incresed to 300° C, then the pressure exerted is
Doubled
Halved
Trebled
Unpredictable
Q.39
Assuming that CO₂ obeys perfect gas law, calculate the density of CO₂ (in kg/m³) at 263°C and 2 atm.
1
2
3
4
Q.40
A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be
-136.5°C
- 136.5°K
-273°C
0°K
Q.41
Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m³ . The diffusivity of aniline in air is 0.74xl0⁻⁵m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10⁻³. The rate of evaporation of aniline is 2.97 x 10⁻⁴. Its units are
Mole/s
Mole/cm². s
Mole/m² . s
Kmole/m² . s
Q.42
A vapor whose partial pressure is less than its equilibrium vapor pressure is called a __________ vapor.
Saturated
Supersaturated
Superheated
None of these
Q.43
Volume occupied by one gm mole of a gas at S.T.P. is
22.4 litres
22400 litres
22.4 c.c
359 litres
Q.44
The number of H⁺ in 1 c.c solution of pH 13 is
6.023 xl0¹³
6.023 x 10¹⁰
6.023xl0⁷
10¹³
Q.45
The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the
Trouton's rule
Kopp's rule
Antonie equation
Kistyakowsky equation
Q.46
Equal masses of CH₄ and H₂ are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
1/9
8/9
1/2
5/9
Q.47
The heat evolved in the combustion of benzene is represented by the equation:
C₆H₆ + 7.5 O₂ = 6CO₂ + 3H₂O, ΔH = 3264.6 kJ/kg. mole
The heat energy change, when 39 gm of C₆H₆ is burnt in an open container, will be __________ kJ/kgmole.
+816.15
+1632.3
-1632.3
-2448.45
Q.48
40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is
1/2
1/3
1/4
2/3
Q.49
The vapor pressure of water at 100°C is
100N/m²
76 cms of Hg
13.6 cms of Hg
760 mm wc
Q.50
Which of the following is not used for computing latent heat of vaporisation?
Clausius-Clayperon equation
Reference substance plots based on Durhing & Othmer plots
Kistyakowasky's equation
Hess
0 h : 0 m : 1 s
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