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Quiz 6
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Q.1
In the reaction, represented by Na₂CO₃ + HC₁ → NaHO₃ + NaCl, the equivalent weight of Na₂CO₃ is
53
5.3
106
10.6
Q.2
One kg of saturated steam at 100°C and 1.01325 bar is contained in a rigid walled vessel. It lias a volume of 1.673 m³. It cools to 98°C ; the saturation pressure is 0.943 bar ; one kg of water vapour under these conditions has a volume of 1.789 m³. The amount of water vapour condensed (in kg) is
0.0
0.065
0.1
1.0
Q.3
Othmer chart is useful in estimating the heat of
Mixing
Wetting
Adsorption
None of these
Q.4
The heat capacity of a substance is
Greater for liquid state than for solid state
Lower for liquid state than for gaseous state
Higher for solid state than for liquid state
Equal for solid and liquid states below melting point
Q.5
Osmotic pressure of the solution can be increased by
Decreasing its temperature
Increasing the volume of the vessel containing the solution
Diluting the solution
None of these
Q.6
The crystallisation of a solute from a solution may be done by
Removal of pure solvent by evaporation
Change of temperature thereby causing supersaturation
Changing the nature of the system by the addition of a more soluble material
All of the above
Q.7
Roult's law is obeyed by a __________ solution.
Saturated
Molar
Normal
None of these
Q.8
Gases having same reduced temperatures and reduced pressures
Deviate from ideal gas behaviour to the same degree
Have nearly the same compressibility factor
Both A & B
Neither A nor B
Q.9
In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is
Independent of temperature
Increases with rise in pressure
Increased with decrease in pressure
Unchanged with pressure changes
Q.10
In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is
Independent of the temperature
Increased with the increase in pressure
Decreased with the increase in pressure
Unchanged by the pressure change
Q.11
What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20)?
AB₃
A₂B₃
A₂B
AB₂
Q.12
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be C
p
= 29.1 J/mole.°C and, C
v
= 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is
13728 J
19206 J
4576 J
12712 J
Q.13
__________ kg of CaCO₃ on heating will give 56 kg of CaO.
56
100
144
1000
Q.14
The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the
Temperature & pressure
Number of intermediate chemical reactions involved
State of aggregation & the state of combination at the beginning & the end of the reaction
None of these
Q.15
Pick out the wrong statement.
To make 100 kg of a solution containing 40% salt by mixing solution A (containing 25% salt) and solution B (containing 50% salt), the amount of solution A required is 40 kg
1.2 gm atoms of carbon and 1.5 gm moles of oxygen are reacted to give 1 gm mole of carbon dioxide. The limiting reactant is carbon. The percent excess reactant supplied is 25
A gas bubble at a pressure of P
g
is passed through a solvent with a saturation vapour pressure of P
s
. If the time of passage of the bubble is long and air is insoluble in the sol
A supersaturated solution of a sparingly soluble solute, at a concentration of C, is being fed to a crystalliser at a volumetric flow rate of V. The solubility .of the solute is C₁. The output rate
Q.16
The unit of dynamic viscosity is
Stoke
Poise
Gm/cm sec
Both B & C
Q.17
The amount of Zn (atomic weight = 65) required to form 224 c.c. of H₂ at N.T.P. on treatment with dilute H₂SO₄ will be __________ gm.
0.065
0.65
6.5
65
Q.18
With rise in temperature, the heat capacity of a substance
Increases
Decreases
Remains unchanged
Either A or B; depends on the substance
Q.19
Heat of neutralisation of HCl and NaOH is - 57.46 kJ/Kg mole. The heat of ionisation of water will be __________ kJ/Kg mole.
57.46
-57.46
114.92
-28.73
Q.20
The increase in the temperature of the aqueous solution will result in decrease of its
Weight % of the solute
Mole fraction of the solute
Molarity
Molality
Q.21
Internal energy is independent of the __________ for an ideal gas.
Pressure
Volume
Both A & B
Neither A nor B
Q.22
Viscosity of atmospheric air may be about __________ centipoise.
0.015
1.5
15
150
Q.23
The value of (C
p
- C
v
)for a real gas obeying Vander Wall's equation is
R
> R
< R
0.5 R
Q.24
For an endothermic reaction, the minimum value of energy of activation will be (where, ΔH = enthalpy of the reaction)
Δ H
>ΔH
0
Q.25
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.
Compressibility
Molecular weight
Humidity
None of these
Q.26
The temperature at which real gases obey the ideal gas law over a wide range of pressure is called the __________ temperature.
Reduced
Boyle
Critical
Inversion
Q.27
The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be
Basic
More acidic
Neutral
Of the same acidity
Q.28
A gas mixture contains 6 moles of H₂ and 2 moles of N₂. If the total pressure of the gaseous mixture is 4 kgf/cm² ; then the partial pressure of N₂ in the mixture will be __________ kgf/cm² .
1
2
4
8
Q.29
Pick out the wrong unit conversion of heat transfer rate.
1 kcal/hr= 1.163 Watt
1 Watt = 1.163 kcal/hr
1 BTU/ft².hr = 2.712 kcal/m².hr
1 kcal/m².hr = 0.3687 BTU/ft².hr = 1.163 Watt/m²
Q.30
A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO₂, 0.05 gm mole of oxygen and 0.80 gm mole of N₂. What is its molecular weight?
28.6
30.0
30.6
32.6
Q.31
Measurement of the amount of dry gas collected over water from volume of moist gas is based on the
Charle's law
Dalton's law of partial pressures
Avogadro's hypothesis
Boyle's law
Q.32
Pick out the wrong statement about the recycle stream in a process.
Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants
The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio
Recycling in a process does not help in getting higher extent of reaction
Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column
Q.33
Which of the following is not a unit of length?
Parsec
Angstrom
Barn
Fermi
Q.34
1 BTU/ft³ is approximately equal to __________ kcal/m³.
1
9
4
252
Q.35
The hydroxyl ion (OH?) concentration in a solution having pH value 3 will be
10??
Q.36
1 gm mole of an alcohol whose molecular weight is 74 contains 48 gms of carbon, 10 gms of hydrogen and 16 gms of oxygen. Its molecular formula is
C₄H
9
OH
C₃H
21
OH
(C₂H₄)
2
H₂.OH
C
2
H
33
OH
Q.37
Solutions having the same osmotic pressure are called __________ solutions.
Dilute
Ideal
Isotonic
Saturated
Q.38
In general, the specific heats of aqueous solutions __________ with increase in the concentration of the solute.
Increase
Decrease
Remain unchanged
None of these
Q.39
Unit of power is
Joule
Watt
Joule/Second
Both B & C
Q.40
For water evaporating into usaturated air under adiabatic conditions and at constant pressure, the __________ remains constant throughout the period of vaporisation.
Dry bulb temperature
Wet bulb temperature
Humidity
Relative saturation
Q.41
Enthalpy of formation of NH₃ is - 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH₃ → N₂ + 3H₂, is equal to __________ kJ/kg. mole.
46
92
-23
-92
Q.42
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the
Vapor follows the ideal gas law
Molal latent heat of vaporisation is constant within the limited temperature range
Volume in the liquid state is negligible compared with that in the vapor state
All of the above
Q.43
1 kg/m² is equal to __________ mm water column.
1
10
100
1000
Q.44
Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces?
RT
(p +a/v²)
(V - b)
1/RT
Q.45
Colligative properties of a dilute solution are those, which depend entirely upon the
Chemical composition of the solute
Constitution of the solute
Number of solute molecules contained in a given volume of the solvent
None of these
Q.46
Colligative properties of a dilute solution are those which depend entirely upon the
Constitution of the solute
Chemical composition of the solute
Number of solute molecules contained in a given volume of the solvent
None of these
Q.47
Osmotic pressure exerted by a solution prepared by dissolving one gram mole of a solute in 22.4 litres of a solvent at 0°C will be __________ atmosphere.
0.5
1
1.5
2
Q.48
In a chemical process, the recycle stream is purged for
Increasing the product yield
Enriching the product
Limiting the inerts
Heat conservation
Q.49
Pick out the wrong conversion formula for the conversion of weight units :
1 tonne = 1000 kg = 22.046 lbs
1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
None of these
Q.50
Molality is defined as the number of gm moles of solute per __________ of solvent.
Litre
Kg
Gm mole
Gm
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