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Free download in PDF Stoichiometry General Knowledge Short Questions & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
41
Pick out the correct conversion?
[A]
1 BTU =453.6 calories
[B]
1 BTU = 252 calories
[C]
1 calorie = 252 BTU
[D]
1 calorie = 453.6 BTU
Answer: 1 BTU = 252 calories
42
Pick out the wrong statement?
[A]
Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks
[B]
Graphite refractories are also called plumbago refractories
[C]
Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
[D]
Calcined magnesite is also called dead burnt magnesite
Answer: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
43
Pick out the wrong statement?
[A]
Refractories used in muffle furnace should have low thermal conductivity
[B]
The electrical resistivity of refractories drops rapidly with rise in temperature
[C]
For reducing spalling tendency, the refractory should be well fired and its porosity should be more
[D]
Refractoriness under load (RUL) of a refractory is always less than its refractoriness
Answer: Refractories used in muffle furnace should have low thermal conductivity
44
The number of H+ in 1 c.c solution of pH 13 is__________________?
[A]
6.023 × 1013
[B]
6.023 × 1010
[C]
6.023 × 107
[D]
1013
45
If 1.5 moles of oxygen combines with aluminium to form Al2O3, then the weight of aluminium (atomic weight = 27) used in this reaction is __________ gm?
[A]
27
[B]
54
[C]
5.4
[D]
2.7
46
In physical adsorption, as compared to chemisorption, the________________________?
[A]
Quantity adsorbed per unit mass is higher
[B]
Rate of adsorption is controlled by the resistance to surface reaction
[C]
Activation energy is very high
[D]
Heat of adsorption is very large
Answer: Quantity adsorbed per unit mass is higher
47
1 bar is almost equal to __________________________ atmosphere?
[A]
1
[B]
10
[C]
100
[D]
1000
48
Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution_____________________?
[A]
A2 is more alkaline than solution A2
[B]
A1 is highly acidic
[C]
A1 is very slightly acidic
[D]
Both A. & C
49
Osmotic pressure of the solution can be increased by_________________?
[A]
Decreasing its temperature
[B]
Increasing the volume of the vessel containing the solution
[C]
Diluting the solution
[D]
None of these
50
Pick out the wrong statement about the recycle stream in a process ?
[A]
Recycling in a process stream helps in utilising the valuable reactants to the maximum with
minimum loss of reactants
[B]
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
[C]
Recycling in a process does not help in getting higher extent of reaction
[D]
Recycling is exemplified by refluxing back a part of the distillate to the distillation column to
maintain the quantity of liquid within the column
Answer: Recycling in a process does not help in getting higher extent of reaction
51
Saturated molal absolute humidity of the vapor-gas mixture depends upon the______________________?
[A]
Vapor pressure at dry bulb temperature
[B]
Total pressure
[C]
Both A. and B.
[D]
Neither A. nor B.
52
Measurement of the amount of dry gas collected over water from volume of moist gas is based on the___________________?
[A]
Charle’s law
[B]
Dalton’s law of partial pressures
[C]
Avogadro’s hypothesis
[D]
Boyle’s law
Answer: Dalton’s law of partial pressures
53
How many phases are present at eutectic point ?
[A]
2
[B]
1
[C]
3
[D]
unpredictable
54
The atomic heat capacities of all solid elements ______________ with decrease in temperature?
[A]
Increases
[B]
Decreases
[C]
Remains unchanged
[D]
Approach zero at 0°C
55
The value of the gas-law constant ‘R’ is 1.987 ?
[A]
kcal/kg-mole.°C
[B]
Btu/lb-mole.°R
[C]
kcal/kg-mole.°K
[D]
Both B. & C
56
Avogadro’s number is equal to__________________?
[A]
6.023 × 1023 molecules/kg.mole
[B]
6.023 × 1023 molecules/gm.mole
[C]
6.023 × 1016 molecules/kg.mole
[D]
6.023 × 1026 molecules/gm.mole
Answer: 6.023 × 1023 molecules/gm.mole
57
The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to________________?
[A]
1.5
[B]
15
[C]
150
[D]
1500
58
A saturated vapor on being compressed would___________________?
[A]
Condense
[B]
Form wet steam
[C]
Both A. & B
[D]
Neither A. nor B.
59
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______________?
[A]
Kinetic energy
[B]
Intermolecular forces of attraction
[C]
Potential energy
[D]
Total energy
60
With rise in temperature, the solubility of ammonia in water at a fixed pressure__________________?
[A]
Increases
[B]
Decreases
[C]
Remains unchanged
[D]
Increases exponentially
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