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Q.1
Solutions which distil without change in composition are called
Ideal
Saturated
Supersaturated
Azeotropic
Q.2
A saturated vapor on being compressed would
Condense
Form wet steam
Both A & B
Neither A nor B
Q.3
A solution of specific gravity 1 consists of 35% A by weight and the remaining B. If the specific gravity of A is 0.7, the specific gravity of Bis
1.25
1.3
1.35
1.2
Q.4
Recycling in a chemical process facilitates
Increased yield
Enrichment of product
Heat conservation
All of the above
Q.5
The unit of C
p
in S.I. units is
W/m².°K
J/kg.°K
W/m.°K
J/m³. °K
Q.6
The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75ρ at a temperature of __________ °K
273°
300°
400°
300°
Q.7
An oxidation process is accompanied by decrease in the
Number of electrons
Oxidation number
Number of ions
All of the above
Q.8
In the reaction, Ca + 2H₂O = Ca(OH)₂ + H₂ ; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water?
(atomic weight of calcium = 40)
4480
2240
1120
0.4
Q.9
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
-5
m²/s.The numerical value of mass transfer co-efficient is 7.4 x 10
-3
. Its units are
M/s
Cm/s
Mole/m².s.Pa
Kmole/m².s.Pa
Q.10
Vapor pressure of water at 100°C is about __________ bar.
0.1013
1.013
10.13
101.3
Q.11
1 centipoise is equivalent to
1 gm/cm.second
1 centistoke
2.42 lb/ft.hr
2.42 lb/ft.second
Q.12
1 kg/cm² is equal to
760 torr
1KPa
10 metres of water column
1 metre of water column
Q.13
The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is
Termed as relative saturation
Not a function of the composition of gas mixture
Called percentage saturation
Not a function of the nature of vapor
Q.14
One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as
Brix = (400/G) - 400
Brix = 200 (G-1)
Brix = 145 - (145/G)
None of these
Q.15
Pick out the wrong statement.
The evaporation of aqueous solution of glucose causes its molarity to increase
Both the freezing point as well as boiling point of sea water is more than that of distilled water
The solution containing equal masses of two liquids 'X' and 'Y' has the same mole fraction of' 'X' and 'Y'
Both B and C
Q.16
C
p
is expressed in S.I. unit as
J/kg.°K
0°K
W/m². °C
W/m. °K
Q.17
With rise in temperature, the solubility of ammonia in water at a fixed pressure
Increases
Decreases
Remains unchanged
Increases exponentially
Q.18
A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of
3
100
1000
None of these
Q.19
Two solutions A₁ and A₂ have pH value of 2 and 6 respectively. It implies that the solution
A₁ is more alkaline than solution A₂
A₁ is highly acidic
A₁ is very slightly acidic
Both A & C
Q.20
1 torr is equal to __________ mm Hg column.
1
0.1
10
1000
Q.21
Viscosity of 1 centipoise is equal to 1 centis-toke in case of
Water
Mercury
Carbon tetrachloride
None of these
Q.22
1m³ is approximately equal to
28 litres
35 ft³
4.5 litres
4.5 ft³
Q.23
80 kg of Na₂SO₄ (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na₂SO₄ .10H₂O crystals separate out. The weight fraction of Na₂SO₄ in the remaining solution is
0.00
0.18
0.24
1.00
Q.24
1 kgf/cm² is not equal to
1 torr
1 bar
10000 mm wc
100 KPa = 100 000 N/m²
Q.25
1 torr is equivalent to
1 mm Hg
1 Pascal
1 ata
1 mm wc
Q.26
The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 x __________
10
26
10
23
10
20
10
19
Q.27
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 latent heat of condensation (kJ/kg⁻¹ ) under these conditions is
40732
2676
2263
540
Q.28
Size range of the colloidals particles is
5 - 200 milli-microns
50 - 200 microns
500 - 1000 microns
10 - 50 Angstrom
Q.29
In a binary liquid system, the composition expressed as __________ is independent of the temperature & pressure.
Kg of solute/kg of solvent
Kg-mole of solute/kg-mole of solvent
Kg-mole of solute/1000 kg of solvent
All of the above
Q.30
CaCO₃ contains __________ percent of Ca by weight.
40
48
96
12
Q.31
Percentage saturation of a vapor bearing gas is always __________ the relative saturation.
Higher than
Smaller than
Equal to
Either A or B; depends on the system
Q.32
A 'limiting reactant' is the one, which decides the __________ in the chemical reacation.
Equilibrium constant
Conversion
Rate constant
None of these
Q.33
The heat of vaporisation __________ with increase in pressure.
Increases
Decreases
Becomes zero at critical pressure
Both B and C
Q.34
Pick out the wrong statement.
One kg-mole of an ideal gas occupies 22.4 m³ at N.T.P
One lb-mole of an ideal gas occupies 359 ft³ at N.T.P
One gm-mole of an ideal gas occupies 22.4 litres (i.e., 22400 c.c) at N.T.P
Density of dry air at N.T.P. is 1 gm/litre
Q.35
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because
The strong base and strong acid reacts completely
The salt formed does not hydrolyse
Only OH⁻ and H⁺ ions react in every case
The strong base and strong acid reacts in aqueous solution
Q.36
Na₂SO₄. 10H₂O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na₂SO₄. The final concentration of the solute in the solution is 10%. The weight of crystals is
20
32.2
45.35
58.65
Q.37
pH value of H₂SO₄ (5% concentration) is
5
7
> 7
< 7
Q.38
Pick out the wrong unit conversion of heat transfer co-efficient.
1 kcal/m².hr.°C = 0.2048 BTU/ft².hr. °F. = 1.163 W/m².°K
1 kcal/m².hr.°K = 1.163 W/m².°C
1 W/m² . °C = 0.1761 BTU/ft².hr.°F
1 BTU/ft².hr.°F = 4.88 kcal/m².hr.°C = 20.44 kJ/m².hr°C = 5.678 W/m².°C
Q.39
Which of the following is an exothermic reaction?
Conversion of graphite to diamond
Decomposition of water
Dehydrogenation of ethane to ethylene
None of these
Q.40
Which of the following is not a unit of pressure?
Torr
Newton/m²
Parsec
Ata, bar or pascal
Q.41
The most convenient way of expressing solution concentration is in terms of
Mole fraction
Normality
Molality
Molarity
Q.42
For a given mass of a gas at constant temperature, if the volume 'V' becomes three times, then the pressure 'P' will become
P/3
3P
9P²
9P
Q.43
1 ata is equivalent to
1 atm
10 torr
0.98 Pascal
1 kgf/cm²
Q.44
The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be __________ times.
1/2
4
√2
1/4
Q.45
Which of the following is followed by an ideal solution ?
Boyle's law
Amgat's law
Raoult's law
Trouton's rule
Q.46
C
p
equals C
v
at
0°C
0°K
0°F
0°R
Q.47
C
p
/C
v
for monoatomic gases is
1.44
1.66
1.99
1
Q.48
Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half, will result in __________ in the volume of the gas.
No change
Doubling
L/4
th
reduction
Four fold increase
Q.49
The vapour pressure of a solution (made by dissolving a solute in a solvent) is __________ that of the pure solvent.
Less than
More than
Equal to
Either more or less; depends on the solvent
Q.50
Pick out the wrong unit conversion of mass transfer co-efficient.
1 lb/hr.ft³.atm. = 4.8182 kg/hr.m².bar
1 kg/hr.m².atm= 0.98687 kg/hr. m .bar
1 lb/hr . ft² = 4.8823 kg/hr . m²
1 kg/hr . m² = 4.8823 lb/hr . ft²
0 h : 0 m : 1 s
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