New Chemical Engineering MCQs – Up To Date Competitive Stoichiometry MCQs
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Latest Chemical Engineering MCQs
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Latest Stoichiometry Mcqs
The most occurred mcqs of Stoichiometry in past papers. Past papers of Stoichiometry Mcqs. Past papers of Stoichiometry Mcqs . Mcqs are the necessary part of any competitive / job related exams. The Mcqs having specific numbers in any written test. It is therefore everyone have to learn / remember the related Stoichiometry Mcqs. The Important series of Stoichiometry Mcqs are given below:
Pick out the wrong statement?
A. 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
B. 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
C. A gas bubble at a pressure of Pg is passed through a solvent with a saturation vapour pressure of Ps. If the time of passage of the bubble is long and air is insoluble in the solvent, the mole fraction of solvent in the bubble will be equal to Ps/Pg
D. 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 of solids from an efficient crystalliser is (C + C1) V
Pick out the wrong statement?
A. At the boiling point of liquid at the prevailing total pressure, saturated absolute humidity is infinite
B. Clausius-Clapeyron equation relates the latent heat of vaporisation to the slope of the vapor pressure curve
C. Percentage saturation and relative saturation are numerically equal for an unsaturated vapor gas mixture
D. Clapeyron equation is given by dP/dT = (λ/T) (VG – VL); where, P = vapor pressure, T = absolute temperature, λ = latent heat of vaporisation, VG and VL = volumes of gas and liquid respectively
The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?
A. -109.5
B. +180
C. +109.5
D. +100
Which of the following is followed by an ideal solution ?
A. Amagat’s law
B. Boyle’s law
C. Raoult’s law
D. Trouton’s rule
Heat of neutralisation of HCl and NaOH is – 57.46 kJ/Kg mole. The heat of ionisation of water will be _____________ kJ/Kg mole?
A. 57.46
B. 114.92
C. -57.46
D. -28.73
Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because_________________?
A. The salt formed does not hydrolyse
B. The strong base and strong acid reacts completely
C. Only OH- and H+ ions react in every case
D. The strong base and strong acid reacts in aqueous solution
Raoult’s law is not applicable to the___________________?
A. Solutes which dissociate or associate in the particular solution
B. Solutions containing non-volatile solute
C. Both B. & D.
D. Concentrated solutions
pH value of H2SO4 (5% concentration) is__________________?
A. 7
B. 5
C. > 7
D. < 7
Kinetic theory of gases stipulates that, the____________________?
A. Molecules possess appreciable volume
B. Energy is lost during molecular collisions
C. Absolute temperature is a measure of the kinetic energy of molecules
D. None of these
The OH- concentration in a solution having pH value 3 is____________________?
A. 10-10
B. 10-3
C. 10-11
D. 10-13
The vapor pressure of water at 100°C is__________________?
A. 13.6 cms of Hg
B. 76 cms of Hg
C. 100 N/m2
D. 760 mm wc
Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?
A. Vapor to solid
B. Vapor to liquid
C. Solid to liquid
D. One allotropic form to another allotropic form
Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?
A. log (1/H+)
B. 1/log H+
C. – log (1/H+)
D. None of these
_____________ fuels require the maximum percentage of ‘excess air’ for complete combustion ?
A. Solid
B. Gaseous
C. Liquid
D. Nuclear
The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?
A. Increases with pressure rise
B. Becomes zero at the critical point
C. Decreases with increasing pressure
D. Both B. & C.
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__________________?
A. Increased with the increase in pressure
B. Independent of the temperature
C. Decreased with the increase in pressure
D. Unchanged by the pressure change
1m3 is approximately equal to_________________?
A. 4.5 litres
B. 35 ft3
C. 28 litres
D. 4.5 ft3
Which of the following gravity scales is used exclusively for liquids heavier than water ?
A. API scale
B. Twaddell scale
C. Baume scale
D. None of these
“The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes”. This is the _____________ law?
A. Gay-Lussac’s
B. Amagat’s
C. Dalton’s
D. Avogadro’s
Internal energy is independent of the ____________ for an ideal gas?
A. Volume
B. Pressure
C. Both A. & B.
D. Neither A. nor B.
Recycling in a chemical process facilitates___________________?
A. Enrichment of product
B. Increased yield
C. Heat conservation
D. All A., B. & C.
Stoichiometry Mcqs
The temperature at which a real gas obeys Boyle’s law is termed as the__________________?
A. Eutectic point
B. Boyle’s temperature
C. Triple point
D. Inversion temperature
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 Xc and Xs respectively. Which of the following statement is correct ?
A. Xc = Xs
B. Xc > Xs
C. Xc < Xs
D. Xc greater/less than Xs depending on the length of the cylinder
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 0.75 ρ at a temperature of ____________ °K?
A. 300°
B. 273°
C. 400°
D. 373°
An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________?
A. 0.2528
B. 0.2500
C. 0.5000
D. 0.5055
1 torr is equivalent to_________________?
A. 1 mm Hg
B. 1 atm
C. 1 Pascal
D. 1 mm wc
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___________________?
A. Increased collision rate among molecules
B. Decrease in mean free path
C. Increase in molecular attraction
D. Increase in average molecular speed
A ‘limiting reactant’ is the one, which decides the ____________ in the chemical reaction?
A. Rate constant
B. Conversion
C. Equilibrium constant
D. None of these
Heat of reaction is not influenced by__________________?
A. The route/method through which final products are obtained
B. Whether the reaction is carried out at constant temperature or constant pressure
C. The physical state (e.g., solid, liquid or gaseous) of reactants and products
D. None of these
If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will_________________?
A. Increase four times
B. Be reduced to 1/4th
C. Increase two times
D. None of these
Gases diffuse faster compared to liquids because of the reason that the liquid molecules_________________?
A. Are held together by stronger inter-molecular forces
B. Have no definite shape
C. Move faster
D. Are heavier
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?
A. -23
B. 92
C. 46
D. -92
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 Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is__________________?
A. 4576 J
B. 19206 J
C. 13728 J
D. 12712 J
Increasing the temperature of an aqueous solution will cause decrease in its________________?
A. Mole fraction
B. Molality
C. Weight percent
D. Molarity
Cp is expressed in S.I. unit as_______________?
A. J/kg.°K
B. W/m2.°C
C. 0°K
D. W/m.°K
In osmosis through a semi-permeable membrane, diffusion of the___________________?
A. Solvent is from low concentration to high concentration region
B. Solute takes place
C. Solvent is from high concentration to low concentration region
D. None of these
Solutions which distil without change in composition are called________________?
A. Saturated
B. Ideal
C. Supersaturated
D. Azeotropic
Process Equipment And Plant Design Mcqs
The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the_______________?
A. Phase rule
B. Empirical equations
C. Experimental data
D. Theoretical equations
If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is _____________ times?
A. 100
B. 10
C. 1000
D. 10000
1 gm mole of methane (CH4) contains_________________?
A. 3.01 × 1023 molecules of methane
B. 4 gm atoms of hydrogen
C. 6.02 × 1023 atoms of hydrogen
D. 3 gms of carbon
In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the________________?
A. Absolute humidity at a given temperature
B. Total pressure
C. Both A. and B.
D. Neither A. nor B.
The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be______________?
A. Basic
B. Neutral
C. More acidic
D. Of the same acidity
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?
A. The component molecules are non polar and are of almost equal size
B. No component is concentrated at the surface of the solution
C. In the formation of solution, chemical combination/molecular association between unlike molecules takes place
D. The attractive forces between like and unlike molecules are almost equal
Gases having same reduced temperatures and reduced pressures_________________?
A. Have nearly the same compressibility factor
B. Deviate from ideal gas behaviour to the same degree
C. Both A. and B.
D. Neither A. nor B.
‘Giga’ stands for__________________?
A. 109
B. 1012
C. 10-12
D. 1015
N.T.P. corresponds to__________________?
A. 1 atm absolute pressure & 0°C
B. 760 torr & 15°C
C. 760 mm Hg gauge pressure & 0°C
D. 101.325 KPa gauge pressure & 0°C
A chemical process is said to occur under unsteady state, if the_________________?
A. Ratio of streams entering/leaving are independent of time
B. Inventory changes do not take place
C. Flow rates & composition both are time dependent
D. None of these
The vapor pressure of liquids of similar chemical nature at any particular temperature _______________ with increase in the molecular weight?
A. Remains unchanged
B. Decreases
C. Increases
D. Either A. or B.; depends on the liquid
Heat of solution in a system in which both solute and solvent are liquids is termed as_________________?
A. Heat of hydration
B. Heat of solvation
C. Standard integral heat of solution
D. Heat of mixing
Pick out the wrong unit conversion of mass transfer co-efficient?
A. 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar
B. 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar
C. 1 lb/hr.ft2 = 4.8823 kg/hr.m2
D. 1 kg/hr.m2 = 4.8823 lb/hr.ft2
1 Pascal (unit of pressure) is equal to _______________ N/m2 ?
A. 0.1
B. 1
C. 10
D. 1000
Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm ?
A. 3
B. 2
C. 1
D. 4
Number of gm moles of solute dissolved in 1 kg of solvent is called its___________________?
A. Molarity
B. Normality
C. Molality
D. Formality
Boiling point of a solution as compared to that of the corresponding solvent is _________________?
A. Same
B. More
C. Less
D. Either more or less; depends upon the solvent
6 gms of magnesium (atomic weight = 24), reacts with excess of an acid, the amount of H2 produced will be ______________ gm?
A. 0.5
B. 3
C. 1
D. 5
With increase in the temperature of pure (distilled) water, its____________________?
A. pH and pOH both increases
B. pOH and pH both decreases
C. pOH decreases and pH increases
D. pH decreases and pOH increases
Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?
A. Boiling point depression
B. Freezing point elevation
C. Vapor pressure lowering
D. All A., B. & C.
1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?
A. 15
B. 10
C. 5
D. 20
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to – 100°C is ____________________?
A. 16.15 kJ
B. 10.73 kJ
C. 18.11 kJ
D. 18.33 kJ
Size range of the colloids particles is __________________?
A. 5 – 200 milli-microns
B. 500 – 1000 microns
C. 50 – 200 microns
D. 10 – 50 Angstrom
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?
A. Is not dependent on the temperature
B. Measures the elevation in boiling point
C. Is a function of the liquid phase composition
D. Measures the depression in freezing point
Percentage saturation of a vapor bearing gas is always _____________ the relative saturation?
A. Equal to
B. Smaller than
C. Higher than
D. Either A. or B.; depends on the system
The temperature at which the second Virial co-efficient of a real gas is zero is called the_____________________?
A. Eutectic point
B. Boiling point
C. Boyle temperature
D. Critical temperature
Polymer Technology Mcqs
Atoms of the same element, but of different masses are called__________________?
A. Isotones
B. Isobars
C. Isotopes
D. None of these
The latent heat of vaporisation__________________?
A. Decreases as pressure increases
B. Decreases with increased temperature
C. Becomes zero at the critical point
D. All A., B. & C.
Atomic ______________ of an element is a whole number?
A. Volume
B. Number
C. Weight
D. Radius
A very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to_________________?
A. x1/x2
B. 1/x2
C. 1 – (x1/x2)
D. x2/x1
Vapor pressure of water at 100°C is about _______________ bar?
A. 10.13
B. 1.013
C. 0.1013
D. 101.3
With increase in temperature, the surface tension of water _____________________?0
A. Remain constant
B. Decreases
C. Increases
D. Increases linearly
An ideal gas can be liquefied, because ___________________?
A. Its critical temperature is more than 0°C
B. Its molecular size is very small
C. Forces operative between its molecules are negligible
D. It gets solidified directly without becoming liquid
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 ?
A. 1/2
B. 1/3
C. 2/3
D. 1/3 × (298/273)
Average molecular weight of air is about ____________________?
A. 23
B. 29
C. 21
D. 79
If pH value of a solution is 8, then its pOH value will be ____________________?
A. 6
B. 7
C. 1
D. 10
The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ____________________?
A. 16
B. 15.5
C. 16.5
D. 17
S.T.P. corresponds to _________________?
A. 1 atm. absolute pressure & 15.5°C
B. 760 torr & 0°C
C. 760 mm Hg gauge pressure & 15.5°C
D. 101.325 kPa gauge pressure & 15.5°C
In general, the specific heats of aqueous solutions _____________ with increase in the concentration of the solute?
A. Remain unchanged
B. Decrease
C. Increase
D. None of these
The chemical nature of an element is independent of_______________________?
A. The number of protons or electrons present in it
B. Its atomic number
C. The number of neutrons present in it
D. None of these
For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?
A. Sodium chloride
B. Anhydrous sodium sulphate
C. Sodium carbonate monohydrate
D. Hypo
At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?
A. 10
B. 8
C. 6
D. 12
The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is_____________________?
A. Termed as relative saturation
B. Called percentage saturation
C. Not a function of the composition of gas mixture
D. Not a function of the nature of vapor
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__________________?
A. Less than 80.1°C
B. 80.1°C
C. 100°C
D. Greater than 80.1°C but less than 100°C
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. The temperature at which the above mixture will exert a pressure of one standard atm. is___________________?
A. 100°C
B. Less than 100°C
C. Between 100 and 110°C
D. 110.6°C
At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be_________________?
A. Nearly equal to 4.69 atm
B. Significantly less than 4.69 atm
C. Significantly more than 4.69 atm
D. Indeterminate due to lack of data
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__________________?
A. Increased with decrease in pressure
B. Increases with rise in pressure
C. Independent of temperature
D. Unchanged with pressure changes
1 ata is equivalent to_________________?
A. 10 torr
B. 1 atm
C. 0.98 Pascal
D. 1 kgf/cm2
Pick out the wrong statement?
A. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a ‘superheated vapor’
B. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure
C. The temperature at which a vapor is saturated is termed as the boiling point
D. The difference between the existing temperature of a vapor and its saturation temperature (i.e.dew point) is called its ‘degree of superheat
Pick out the wrong statement?
A. Heat capacity of a diatomic gas is higher than that of a monatomic gas
B. Equal volumes of Argon and Krypton contain equal number of atoms
C. The binary mixture of a particular composition in both vapor and liquid state is known as an azeotropic mixture
D. Total number of molecules contained in 22.4 litres of hydrogen at NTP is 6.023 x 1023
Pick out the wrong statement ?
A. ‘Reduced temperature’ of a substance is the ratio of its existing temperature to its critical temperature, both expressed on Celsius scale
B. ‘Reduced volume’ is the ratio of the existing molal volume of a substance to its critical molal volume
C. ‘Reduced pressure’ is the ratio of the existing pressure of a substance to its critical pressure
D. None of these
Pick out the wrong unit conversion of calorific value?
A. 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3
B. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
C. 1 BTU/lb = 2.3 kcal/kg
D. 1 kcal/m3 = 0.1124 BTU/ft3
Pick out the wrong statement?
A. Ten times dilution of a normal solution (N) reduces its normality to N/10
B. Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c
C. 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
D. One kg mole of an ideal gas at N.T.P occupies 22400 Nm3