Free Chemical Engineering MCQs Mock Test Online with Answers

Q1 : If 1 Nm3 of O2 contains ‘N’ number of molecules, then number of molecules in 2Nm3 of SO2 will be_________________?

A: N B: N/2 C: 2N D: 4N

Q2 : In a neutral solution _________________?

A: H+ ions are absent B: OH- ions are absent C: Both H+ and OH- ions are present in very small but equal concentration D: None of these

Q3 : The principle applied in liquefaction of gases is_____________________?

A: Adiabatic expansion B: Joule-Thomson effect C: Both A. and B D: Neither A. nor B

Q4 : 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: x2/x1 C: 1 – (x1/x2) D: 1/x2

Q5 : Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________?

A: Calorific value B: Heat of reaction C: Heat of combustion D: Heat of formation

Q6 : An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________?

A: 0.2500 B: 0.2528 C: 0.5000 D: 0.5055

Q7 : Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will_________________?

A: Increase B: Decrease C: Remain unchanged D: First fall and then rise

Q8 : “The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes”. This is the _____________ law?

A: Dalton’s B: Amagat’s C: Gay-Lussac’s D: Avogadro’s

Q9 : For an ideal solution, the value of activity co-efficient is______________________?

A: 0 B: 1 C: 2 D: 3

Q10 : 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: 10.73 kJ B: 16.15 kJ C: 18.11 kJ D: 18.33 kJ

Q11 : 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: Decrease in mean free path B: Increased collision rate among molecules C: Increase in molecular attraction D: Increase in average molecular speed

Q12 : 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: -57.46 C: 114.92 D: -28.73

Q13 : With increase in temperature, the surface tension of water _____________________?

A: Increases B: Decreases C: Remain constant D: Increases linearly

Q14 : The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?

A: Measures the elevation in boiling point B: Is not dependent on the temperature C: Is a function of the liquid phase composition D: Measures the depression in freezing point

Q15 : A source rock that is too immature to generate petroleum in its natural setting is known as__________?

A: Effective Source Rock B: Potential Source Rock C: Unconventional Source Rock D: All of above

Q16 : Any substance above its critical temperature exists as _____________________?

A: Saturated vapour B: Solid C: Gas D: Liquid

Q17 : A system is said to be isopiestic, if there is no ______________ change?

A: Temperature B: Pressure C: Volume D: None of these

Q18 : Percentage saturation of a vapor bearing gas is always _____________ the relative saturation?

A: Higher than B: Smaller than C: Equal to D: Either A. or B.; depends on the system

Q19 : Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?

A: Do not lose energy on collision B: Are above the inversion temperature C: Do not exert attractive force on each other D: Do work equal to loss in kinetic energy

Q20 : 1 Kcal/kg. °C is equivalent to _______________ BTU/lb. °F ?

A: 1 B: 2.42 C: 4.97 D: None of these

Q21 : Domestic refrigerator usually works on the _____________ refrigeration cycle?

A: Carnot B: Air C: Absorption D: vapour-ejection

Q22 : At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?

A: More B: Less C: Same D: More or less; depending on the system

Q23 : Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?

A: Decreases B: Increases C: Remains constant D: Decreases logarithmically

Q24 : Number of gm moles of solute dissolved in one liter of a solution is called its____________________?

A: Equivalent weight B: Molarity C: Molality D: Normality

Q25 : 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?

A: 0.5 B: 1 C: 1.5 D: 2

Q26 : Boiling of liquid is accompanied with increase in the__________________?

A: Vapor pressure B: Specific Gibbs free energy C: Specific entropy D: All (A), B. and (C)

Q27 : In general, the specific heats of aqueous solutions _____________ with increase in the concentration of the solute?

A: Increase B: Decrease C: Remain unchanged D: None of these

Q28 : If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is _____________ times?

A: 10 B: 100 C: 1000 D: 10000

Q29 : Extensive properties of a thermodynamic system depend upon the _____________ of the system?

A: Specific volume B: Temperature C: Mass D: Pressure

Q30 : 1 Pascal (unit of pressure) is equal to _______________ N/m2 ?

A: 10 B: 1 C: 0.1 D: 1000

Q31 : Which is not constant for an ideal gas ?

A: (∂P/∂V)T B: (∂V/∂T)P C: (∂P/∂V)V D: All (A), B. & (C)

Q32 : An ideal gas can be liquefied, because ___________________?

A: Its molecular size is very small B: Its critical temperature is more than 0°C C: Forces operative between its molecules are negligible D: It gets solidified directly without becoming liquid

Q33 : Gases diffuse faster compared to liquids because of the reason that the liquid molecules_________________?

A: Are held together by stronger inter-molecular forces B: Move faster C: Have no definite shape D: Are heavier

Q34 : The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pu

A: T1/(T1-T2 B: T2/(T1-T2) C: T1/T2 D: T2/R1

Q35 : Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces ?

A: RT B: P + (a/V2) C: (V – b) D: 1/RT

Q36 : Clausius-Clapeyron equation is applicable to _____________ equilibrium processes?

A: Solid-vapor B: Solid-liquid C: Liquid-vapor D: All A, B. and C

Q37 : In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _____________ percent?

A: 0.25 B: 0.5 C: 0.75 D: 1

Q38 : The depression in freezing point of a solution is________________?

A: Inversely proportional to the mass of solvent B: Directly proportional to the mole of solute C: Both A. and B. D: Neither A. nor B.

Q39 : Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?

A: Chlorine B: Nitrogen C: Ethane D: All the gases will have the same KE

Q40 : Solutions which distil without change in composition are called________________?

A: Ideal B: Saturated C: Supersaturated D: Azeotropic

Q41 : Entropy change of mixing two liquid substances depends upon the_________________?

A: Molar concentration B: Quantity (i.e. number of moles) C: Both A. and B D: Neither A. nor B

Q42 : The unity of Planck’s constant ‘h’ in the equation, E = hv is____________________?

A: J/s B: J.S C: J/kmol D: kmol/J

Q43 : The most convenient way of expressing solution concentration is in terms of___________________?

A: Mole fraction B: Molality C: Normality D: Molarity

Q44 : A ‘limiting reactant’ is the one, which decides the ____________ in the chemical reaction?

A: Equilibrium constant B: Conversion C: Rate constant D: None of these

Q45 : Entropy is a/an___________________?

A: State function B: Macroscopic property C: Extensive property D: None of these

Q46 : Refrigeration capacity of a household refrigerator may be round about _____________ tons?

A: 0.15 B: 1.5 C: 4.5 D: 6.5

Q47 : The quantity of heat required to evaporate 1 kg of a saturated liquid is called __________________?

A: Specific heat B: 1 Kcal C: Sensible heat D: Latent heat

Q48 : In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will___________________?

A: Increase the partial pressure of H2 B: Increase the partial pressure of I2 C: Increase the total pressure and hence shift the equilibrium towards the right D: Not affect the equilibrium conditions

Q49 : Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?

A: Less than B: Same as C: More than D: Half

Q50 : 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: Not a function of the composition of gas mixture C: Called percentage saturation D: Not a function of the nature of vapor

Q51 : Pick out the wrong statement ?

A: Minimum number of degree of freedom of a system is zero B: Degree of freedom of a system containing a gaseous mixture of helium, carbon dioxide and hydrogen is 4 C: For a two phase system in equilibrium made up of four non-reacting chemical species, the number of degrees of freedom is 4 D: Enthalpy and internal energy change is zero during phase change processes like melting, vaporisation and sublimation

Q52 : Atmospheric pressure corresponds to a hydrostatic head of_________________?

A: 13.6 cms of Hg B: 34 ft ofH2O C: 1 metre of H2O D: 13.6 metres of Hg

Q53 : Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ?

A: dE = Tds – PdV B: dQ = CvdT + PdV C: dQ = CpdT + Vdp D: Tds = dE – PdV

Q54 : For a constant pressure reversible process, the enthalpy change (ΔH) of the system is___________________?

A: Cv.dT B: Cp.dT C: ∫ Cp.dT D: ∫ Cv.dT

Q55 : Kinetic theory of gases stipulates that, the____________________?

A: Energy is lost during molecular collisions B: Molecules possess appreciable volume C: Absolute temperature is a measure of the kinetic energy of molecules D: None of these

Q56 : Entropy change for an irreversible isolated system is__________________?

A: ∞ B: 0 C: < 0 D: > 0

Q57 : Throttling (Joule-Thomson effect) process is a constant _____________ process?

A: Enthalpy B: Entropy C: Pressure D: None of these

Q58 : For a single component two phase mixture, the number of independent variable properties are_________________?

A: Two B: One C: Zero D: Three

Q59 : For an ideal gas, the chemical potential is given by______________?

A: RT d ln P B: R d ln P C: R d ln f D: None of these

Q60 : The thermodynamic law, PVy = constant, is not applicable in case of______________?

A: Ideal compression of air B: Free expansion of an ideal gas C: Adiabatic expansion of steam in a turbine D: Adiabatic compression of a perfect gas

Q61 : ‘Giga’ stands for__________________?

A: 109 B: 10-12 C: 1012 D: 1015

Q62 : On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will____________________?

A: Increase B: Decrease C: Remain same D: Increase in summer and will decrease in winter

Q63 : 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: 15.5 B: 16 C: 16.5 D: 17

Q64 : The chemical nature of an element is independent of_______________________?

A: Its atomic number B: The number of protons or electrons present in it C: The number of neutrons present in it D: None of these

Q65 : With increase in the temperature of pure (distilled) water, its____________________?

A: pOH decreases and pH increases B: pOH and pH both decreases C: pH and pOH both increases D: pH decreases and pOH increases

Q66 : If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?

A: The solvent begins to freeze out even before B: It will undergo no change until C: It will not solidify even on D: None of these

Q67 : The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ____________ temperature?

A: Critical B: Boyle C: Inversion D: Reduced

Q68 : A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid?

A: Sub-cooled B: Saturated C: Non-solidifiable D: None of these

Q69 : In the reaction, represented by, 2SO2 + O2 ⇌ 2SO3; ΔH = – 42 kcal; the forward reaction will be favoured by____________________?

A: Low temperature B: High pressure C: Both A. and B D: Neither A. nor B

Q70 : Molar heat capacity of water in equilibrium with ice at constant pressure is_____________________?

A: 0 B: ∞ C: 1 D: None of these

Q71 : Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ?

A: Sv B: 1/St C: St D: 1/Sv

Q72 : At a temperature of 0°K, the molecules of a gas have only _______________ energy?

A: Rotational B: Vibrational C: Translational D: None of these

Q73 : Gibbs-Duhem equation_____________________?

A: States that n1dμ1 + n2dμ2 + ….njdμj = 0, for a system of definite composition at constant temperature and pressure B: Applies only to binary systems C: Finds no application in gas-liquid equilibria involved in distillation D: None of these

Q74 : Which of the following is a type of sedimentary rock?

A: Organic rock B: Chemical rock C: Clastic rock D: All of the above

Q75 : Which of the following is not a colligative property ?

A: Osmotic pressure B: Depression of freezing point C: Lowering of vapor pressure D: None of these

Q76 : White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_______?

A: Tar B: Sulphide Coke C: Coke Oven Gas D: Pulverised coke

Q77 : Clausius Clapeyron equation applies to the _____________ process?

A: Sublimation B: Melting C: Vaporisation D: All A., B. & C.

Q78 : In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ?

A: 30 c.c acid and 30 c.c base B: 20 c.c acid and 25 c.c base C: 15 c.c acid and 35 c.c base D: 35 c.c acid and 15 c.c base

Q79 : 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: +109.5 C: +180 D: +100

Q80 : 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?

A: 4 J B: ∞ C: 0 D: 8 J

Q81 : In osmosis through a semi-permeable membrane, diffusion of the___________________?

A: Solvent is from low concentration to high concentration region B: Solvent is from high concentration to low concentration region C: Solute takes place D: None of these

Q82 : is desired to bring about a certain change in the state of a system by performing work on the system under adiabatic conditions ?

A: The amount of work needed is path dependent B: Work alone cannot bring out such a change of state C: The amount of work needed is independent of path D: More information is needed to conclude anything about the path dependence or otherwise of the work needed

Q83 : The total number of atoms in 8.5 gm of NH3 is _______________ × 1023?

A: 9.03 B: 3.01 C: 1.204 D: 6.02

Q84 : If an ideal solution is formed by mixing two pure liquids in any proportion, then the ___________________ of mixing is zero?

A: Enthalpy B: Volume C: Both A. & B. D: Neither A nor B

Q85 : What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ?

A: AB3 B: A2B3 C: A2B D: AB2

Q86 : The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________?

A: (∂T/∂V)S = – (∂P/∂S)V B: (∂S/∂P)T = – (∂V/∂T)P C: (∂V/∂S)P = (∂T/∂P)S D: (∂S/∂V)T = (∂P/∂T)V

Q87 : A gas shows deviation from ideal behaviour at______________?

A: Low pressure and high temperature B: Low pressure and low temperature C: Low temperature and high pressure D: High temperature and high pressure

Q88 : The internal energy of a gas obeying P (V – b) RT (where, b is a positive constant and has a constant Cv), depends upon its________________?

A: Pressure B: Volume C: Temperature D: All A, B. & C

Q89 : Change of state namely evaporation condensation, freezing and melting is an _______________ process?

A: Isothermal B: Adiabatic C: Isobaric D: Isochoric

Q90 : If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will___________________?

A: Increase B: Decrease C: Remain unaltered D: Increase or decrease; depends on the particular reaction

Q91 : According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?

A: T B: T0.5 C: T1.5 D: T2

Q92 : Entropy of the system decreases, when_______________?

A: Snow melts into water B: A gas expands spontaneously from high pressure to low pressure C: Water is converted into ice D: Both B. & C

Q93 : 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 xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?

A: PvB B: xB.PvB C: (Patm – Pvw)xB D: xB.Patm

Q94 : A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

A: 0°C B: 0°K C: 136.5°C D: -136.5°K

Q95 : The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________?

A: 0.07 B: 0.09 C: 0.11 D: 0.13

Q96 : Recycling in a chemical process facilitates___________________?

A: Increased yield B: Enrichment of product C: Heat conservation D: All A., B. & C.

Q97 : Increasing the temperature of an aqueous solution will cause decrease in its________________?

A: Molality B: Mole fraction C: Weight percent D: Molarity

Q98 : The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is__________________?

A: ∞ B: 1 C: 0 D: -ve

Q99 : The internal energy of an ideal gas does not change in a reversible _____________ process?

A: Isothermal B: Adiabatic C: Isobaric D: Isometric

Q100 : Total energy at a point comprises of _____________ energy?

A: Potential & kinetic B: Pressure C: Internal D: All A., B. & C.

Free Chemical Engineering MCQs Mock Test Online with Answers

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