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Quiz 4
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Q.1
With increase in the temperature of pure (distilled) water, its
POH decreases and pH increases
POH and pH both 4ecreases
PH and pOH both increases
PH decreases and pOH increases
Q.2
1 gm mole of methane (CH₄) contains
6.02 x 10
23
atoms of hydrogen
4 gm atoms of hydrogen
3.01 x 10
23
molecules of methane
3 gms of carbon
Q.3
Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is x
B
and the vapour pressures of benzene and water at these conditions are P
v
B
and P
v
w
respectively. The partial pressure of benzene in air-vapour mixture is
P
v
B
X
B
.P
v
B
(P
atm
- P
v
w
)x
B
X
B
.P
atm
Q.4
Pick out the wrong unit conversion of temperature.
°R = 273 + °F
Temperature difference of 1°K = 1°C = 9/5 °F
°C = (F- 32) x 0.555
°F = (°C + 17.778) x 1.8
Q.5
On mixing 56 gm of CaO with 63 gm of HNO₃, the amount of Ca(NO₃)₂ formed is __________ gm.
82
164
41
8.2
Q.6
For an ideal solution, the total vapor pressure varies __________ with the composition(expressed as mole fraction).
Inversely
Exponentially
Linearly
Negligibly
Q.7
N.T.P. corresponds to
1 atm.absolute pressure& 0°C
760 mm Hg gauge pressure & 0°C
760 torr & 15°C
101.325 KPa gauge pressure & 0°C
Q.8
Heat of solution in a system in which both solute and solvent are liquids is termed as
Heat of solvation
Heat of hydration
Standard integral heat of solution
Heat of mixing
Q.9
Mass number of an atom is the sum of the numbers of
Neutrons and protons
Protons and electrons
Neutrons and electrons
Both A & B
Q.10
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.
No component is concentrated at the surface of the solution
The component molecules are non polar and are of almost equal size
In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The attractive forces between like and unlike molecules are almost equal
Q.11
Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).
°API = 200(G - 1)
°API = (141.5/G) - 131.5
°API = (140/G) - 130
°API = 145 - (145/G)
Q.12
As per Kirchoff s equation, the heat of reaction is affected by the
Pressure
Volume
Temperature
Molecularity
Q.13
N₂ content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)
80%
90%
95%
98%
Q.14
Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is
1.72
0.58
0.5
0.2
Q.15
__________ equation gives the effect of temperature on heat of reaction.
Kirchoffs
Maxwell's
Antonie
Kistyakowsky
Q.16
According to the kinetic theory, the thermal conductivity of a monoatomic gas is proportional to
T
T
0.5
T
1.5
T
2
Q.17
How much O₂ can be obtained from 90 kg of water?
32 kg
80 kg
64 kg
90 kg
Q.18
1 BTU/lb.←°F is equivalent to __________ kcal/kg.°C.
1
2.42
1.987
4.97
Q.19
A solution with reasonably permanent pH is called a/an __________ solution.
Ideal
Non-ideal
Buffer
Colloidal
Q.20
The heat of adsorption of a gas caused by Van der Walls forces of attraction and capillarity is equal to the heat of
Normal condensation
Wetting
Sum of A and B
Difference of A and B
Q.21
__________ equation relates latent heat and boiling point.
Antonie
Kistyakowsky
Kopp's
Trouton's
Q.22
Degrees of freedom will be equal to the number of components for a system comprising of
Only soluble liquid components
Partially miscible two liquid components system having two phases
Two liquid components and one solute (soluble in both the liquids)
None of these
Q.23
Boiling point of a non-homogeneous mixture of immiscible liquids is __________ that of any one of its separate components.
Lower than
Higher than
Equal to
Either A or B; depends on the liquids
Q.24
At standard conditions,
N₂ + 2O₂ ⇋ 2NO₂; ΔG° = 100 kJ/mole
NO + ½O₂ ⇋ 2NO₂; ΔG° = -35 kJ/mole
The standard free energy of formation of NO in kJ/mole is
15
30
85
170
Q.25
Pick out the wrong statement:
The integral heat of solution of either components can not be calculated from heat of mixing data
The average value of heat of neutralisation of dilute solutions of weak acids and bases is much less compared to that for strong acids and bases
The standard heat of solution of the hydrate of a substance is the difference between the heat of solution of the anhydrous substance and its heat of hydration
The accompanying enthalpy change, when a solute is dissolved in solvent, depends upon the nature & amount of the solute & the solvent, on the temperature & on the initial & final conce
Q.26
Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent?
Temperature
Nature of solute
Pressure
Nature of solvent
Q.27
For the gaseous phase reaction, N₂ + O₂ ⇋ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by
Increasing the concentration of N₂
Decrease in temperature
Increase in pressure
Decrease in pressure
Q.28
Internal energy of a substance comprises of the __________ energy.
Vibrational
Rotational
Translational
All of the above
Q.29
At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to
Decrease in mean free path
Increased collision rate among molecules
Increase in molecular attraction
Increase in average molecular speed
Q.30
The average translational kinetic energy with which a gas molecule is endowed is dependent on its
Nature
Size
Absolute temperature
All of the above
Q.31
Which of the following has the smallest least effect on the solubility of a solute into the solvent?
Nature of the solute
Nature of the solvent
Temperature
Pressure
Q.32
Atoms of the same element, but of different masses are called
Isobars
Isotones
Isotopes
None of these
Q.33
A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are X
c
and X
s
respectively. Which of the following statement is correct?
X
c
> X
s
X
c
= X
s
X
c
< X
s
X
c
greater/less than X
s
depending on the length of the cylinder
Q.34
pH value of an alkaline solution is
7
> 7
< 7
Constant over a wide range
Q.35
Average molecular weight of air is about
21
29
23
79
Q.36
If 1 Nm³ of O₂ contains 'N' number of molecules, then number of molecules in 2Nm³ of SO₂ will be
N
N/2
2N
4N
Q.37
The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.
Lower than
Higher than
Same as
Not related to
Q.38
Assume that benzene is insoluble in water. The normal boiling points of benzene and water are 80.1 and 100°C respectively. At a pressure of 1 atm, the boiling point of a mixture of benzene and water is
80.1°C
Less than 80.1°C
100°C
Greater than 80.1°C but less than 100°C
Q.39
Applicability of Claussius-Clapeyron equation is subject to the condition that the
Vapor follows ideal gas law
Volume in the liquid state is negligible
Both A & B
Neither A nor B
Q.40
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the
Atomic weight of the metal is 4
Equivalent weight of the metal is 4
Atomic weight of the metal is 2
Equivalent weight of the metal is 8
Q.41
Which of the following is insensitive to changes in pressure?
Heat of vaporisation
Melting point
Heat of fusion
Both B & C
Q.42
Number of gram equivalent of solute dissolved in one litre of solution is called its
Normally
Molarity
Molality
Formality
Q.43
Concentration of a solution expressed in terms of __________ is independent of temperature.
Molarity
Normality
Molality
None of these
Q.44
Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the
Recycling
Purging
Bypassing
Recirculation
Q.45
Which of the following gases is the most soluble in water?
NH₃
CO₂
H₂S
CH₄
Q.46
NaOH contains __________ percent oxygen.
1
10
16
40
Q.47
Increasing the temperature of an aqueous solution will cause decrease in its
Molality
Mole fraction
Weight percent
Molarity
Q.48
In a neutral solution
H⁺ ions are absent
OH⁻ ions are absent
Both H⁺ and OH⁻ ions are present in very small but equal concentration
None of these
Q.49
A vessel of volume 1000 m³ contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately
17
20
25
34
Q.50
Pick out the correct statement.
Heat of solution is always positive
At equilibrium, ΔG is zero
For the reaction, PCl5 ⇋ PCl3 + Cl₂, ΔG is less than ΔE
The heating of water in a beaker is an example of an isolated system
0 h : 0 m : 1 s
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