Free Chemical Engineering MCQs Mock Test Online with Answers

Q1 : Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?

A: Freezing point elevation B: Boiling point depression C: Vapor pressure lowering D: All A., B. & C.

Q2 : The equation Tds = dE – PdV applies to___________________?

A: Single phase fluid of varying composition B: Single phase fluid of constant composition C: Open as well as closed systems D: Both B. and C

Q3 : The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________?

A: 0.4 B: 0.6 C: 0.8 D: 0.2

Q4 : A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?

A: 380 B: 630 C: 760 D: 880

Q5 : Total energy at a point comprises of _____________ energy?

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

Q6 : In a turbine, the fluid expands almost_________________?

A: Isothermally B: Isobarically C: Adiabatically D: None of these

Q7 : In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the________________?

A: Total pressure B: Absolute humidity at a given temperature C: Both A. and B. D: Neither A. nor B.

Q8 : Recycling in a chemical process facilitates___________________?

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

Q9 : 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

Q10 : _______________ functions are exemplified by heat and work ?

A: Path B: Point C: State D: None of these

Q11 : All gases above its inversion temperature, in a throttling process will show__________________?

A: A heating effect B: No change in temperature C: A cooling effect D: Either A. or (C)

Q12 : 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

Q13 : The temperature at which the second Virial co-efficient of a real gas is zero is called the_____________________?

A: Eutectic point B: Boyle temperature C: Boiling point D: Critical temperature

Q14 : Any substance above its critical temperature exists as _____________________?

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

Q15 : 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

Q16 : The first law of thermodynamics is a restatement of the law of conservation of_________________?

A: Mass B: Energy C: Momentum D: None of these

Q17 : Enthalpy ‘H’ is defined as___________________?

A: H = E – PV B: H = F – TS C: H – E = PV D: None of these

Q18 : For an ideal solution, the value of activity co-efficient is______________________?

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

Q19 : (∂H/∂T)P is the mathematical expression for____________________?

A: CV B: Entropy change C: Gibbs free energy D: None of these

Q20 : 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_________________?

A: 0.00 B: 0.18 C: 0.24 D: 1.00

Q21 : “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

A: Raoult’s B: Henry’s C: Amagat’s D: None of these

Q22 : 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: 2/3 B: 1/3 C: 1/2 D: 1/3 × (298/273)

Q23 : Pick out the correct statement?

A: If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, B: A process is irreversible as long as Δ S for the system is greater than zero C: The mechanical work done by a system is always equal to∫P.dV D: The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

Q24 : 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?

A: 4 J B: ∞ C: 0 D: 8 J

Q25 : 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

Q26 : 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

Q27 : 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: 46 B: 92 C: -23 D: -92

Q28 : 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: 6 B: 8 C: 10 D: 12

Q29 : The number of degrees of freedom at the triple point of water is__________________?

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

Q30 : 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

Q31 : Work done is a____________________?

A: Property of the system B: Path function C: Point function D: State description of a system

Q32 : 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

Q33 : When pressure is applied on the system, ice ↔ water, then_________________?

A: Equilibrium cannot be established B: More ice will be formed C: More water will be formed D: Evaporation of water will take place

Q34 : If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c?

A: 100 B: 50 C: 205 D: 200

Q35 : 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: No component is concentrated at the surface of the solution B: The component molecules are non polar and are of almost equal size C: In the formation of solution, chemical combination/molecular association between unlike D: The attractive forces between like and unlike molecules are almost equal

Q36 : Heat of reaction is not influenced by__________________?

A: The route/method through which final products are obtained B: The physical state (e.g., solid, liquid or gaseous) of reactants and products C: Whether the reaction is carried out at constant temperature or constant pressure D: None of these

Q37 : pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?

A: 0 B: 10 C: 7 D: 14

Q38 : The four properties of a system viz. P, V, T, S are related by ______________ equation?

A: Gibbs-Duhem B: Gibbs-Helmholtz C: Maxwell’s D: None of these

Q39 : On mixing 56 gm of CaO with 63 gm of HNO3, the amount of Ca(NO3)2 formed is ______________ gm?

A: 82 B: 164 C: 41 D: 8.2

Q40 : 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

Q41 : Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be___________________?

A: Same B: Doubled C: Halved D: One fourth of its original value

Q42 : The heat capacity of most substances is greater for the _______________ state?

A: Solid B: Liquid C: Gaseous D: None of these

Q43 : Which of the following has the minimum value of COP for a given refrigeration effect ?

A: Reverse Carnot cycle B: Ordinary vapour-compression cycle C: Vapour-compression process with a reversible expansion engine D: Air refrigeration cycle

Q44 : Claude gas liquefaction process employs cooling___________________?

A: At constant pressure B: By throttling C: By expansion in an engine D: None of these

Q45 : 1 torr is equivalent to_________________?

A: 1 mm Hg B: 1 Pascal C: 1 atm D: 1 mm wc

Q46 : What is the value of ln y (where y = activity co-efficient) for ideal gases ?

A: Zero B: Unity C: Infinity D: Negative

Q47 : The heat capacity of a substance is ____________________?

A: Greater for liquid state than for solid state B: Lower for liquid state than for gaseous state C: Higher for solid state than for liquid state D: Equal for solid and liquid states below melting point

Q48 : 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 ?

A: 1 B: 2 C: 4 D: 8

Q49 : The activity of an ideal gas is numerically ____________ its pressure?

A: More than B: Less than C: Equal to D: Data insufficient, can’t be predicted

Q50 : At a temperature of 0°K, the molecules of a gas have only _______________ energy?

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

Q51 : Disappearance of snow in subzero weather exemplifies the process of_________________?

A: Evaporation B: Sublimation C: Vaporisation D: Melting

Q52 : The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _____________ in the two phases?

A: Potential energy B: Intermolecular forces C: Kinetic energy D: Total energy

Q53 : A chemical process is said to occur under unsteady state, if the_________________?

A: Inventory changes do not take place B: Ratio of streams entering/leaving are independent of time C: Flow rates & composition both are time dependent D: None of these

Q54 : Which of the following has the smallest least effect on the solubility of a solute into the solvent ?

A: Nature of the solute B: Nature of the solvent C: Temperature D: Pressure

Q55 : Domestic refrigerator usually works on the _____________ refrigeration cycle?

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

Q56 : 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

Q57 : Read More Details about this Mcq: Volume occupied by one gm mole of a gas at S.T.P. is ____________________?

A: 22.4 litres B: 22400 litres C: 22.4 c.c D: 359 litres

Q58 : A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system________________?

A: its internal energy (U) decreases and its entropy (S) increases B: U and S both decreases C: U decreases but S is constant D: U is constant but S decreases

Q59 : Increasing the temperature of an aqueous solution will cause decrease in its________________?

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

Q60 : The temperature at which a real gas obeys Boyle’s law is termed as the__________________?

A: Triple point B: Boyle’s temperature C: Eutectic point D: Inversion temperature

Q61 : 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

Q62 : 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

Q63 : Boiling point of a solution as compared to that of the corresponding solvent is _________________?

A: Less B: More C: Same D: Either more or less; depends upon the solvent

Q64 : What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?

A: TR/(T2 – TR) × (T1 – T2)/T1 B: TR/(T2 – TR) × T1/(T1 – T2) C: TR/(T1 – TR) × (T1 – T2)/T1 D: None of these

Q65 : In an irreversible process________________?

A: Tds = dE – dW = 0 B: dE – dW – Tds = 0 C: Tds – dE + dW < 0 D: Tds – dT + dW < 0

Q66 : 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

Q67 : Size range of the colloids particles is __________________?

A: 5 – 200 milli-microns B: 50 – 200 microns C: 500 – 1000 microns D: 10 – 50 Angstrom

Q68 : Entropy change for an irreversible isolated system is__________________?

A: ∞ B: 0 C: < 0 D: > 0

Q69 : 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: Decreases with increasing pressure C: Becomes zero at the critical point D: Both B. & C.

Q70 : 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

Q71 : Entropy is a/an___________________?

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

Q72 : Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?

A: T2/(T1 – T2) B: T1/(T1 – T2) C: (T1 – T2)/T1 D: (T1 – T2)/T2

Q73 : 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 strong base and strong acid reacts completely B: The salt formed does not hydrolyse C: Only OH- and H+ ions react in every case D: The strong base and strong acid reacts in aqueous solution

Q74 : When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is___________________?

A: Same in both the phases B: Zero in both the phases C: More in vapour phase D: More in liquid phase

Q75 : If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will_________________?

A: Be reduced to 1/4th B: Increase four times C: Increase two times D: None of these

Q76 : The most blister form of copper is__________?

A: impure copper B: processed copper C: none of these D: refined copper

Q77 : Raoult’s law is not applicable to the___________________?

A: Solutes which dissociate or associate in the particular solution B: Concentrated solutions C: Both B. & C. D: Solutions containing non-volatile solute

Q78 : Which is not a refrigerant ?

A: SO2 B: NH3 C: CCl2F2 D: C2H4Cl2

Q79 : 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

Q80 : Pick out the wrong unit conversion of mass transfer co-efficient?

A: 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar B: 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar C: 1 lb/hr.ft2 = 4.8823 kg/hr.m2 D: 1 kg/hr.m2 = 4.8823 lb/hr.ft2

Q81 : Heat requirement for decomposition of a compound into its elements is _____________ that is evolved during the formation of that compound from its elements?

A: The same B: Less than C: Greater than D: Different than

Q82 : Chemical potential is a/an_____________________?

A: Extensive property B: Intensive property C: Force which drives the chemical system to equilibrium D: Both B. and C

Q83 : 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

Q84 : Which of the following is not a unit of kinematic viscosity ?

A: Poise B: Stoke C: cm2/second D: None of these

Q85 : 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

Q86 : 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 ?

A: 28.6 B: 30.0 C: 30.6 D: 32.6

Q87 : Clausius-Clapeyron equation is applicable to _____________ equilibrium processes?

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

Q88 : Specific/molar Gibbs free energy for a pure substance does not change during________________?

A: Sublimation B: Vaporisation C: Melting D: Either A, B. or C.

Q89 : 1 gm mole of methane (CH4) contains_________________?

A: 6.02 × 1023 atoms of hydrogen B: 4 gm atoms of hydrogen C: 3.01 × 1023 molecules of methane D: 3 gms of carbon

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 : ________________ decreases during adiabatic throttling of a perfect gas?

A: Entropy B: Temperature C: Enthalpy D: Pressure

Q92 : 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

Q93 : Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?

A: T2/(T1 – T2) B: T1/(T1 – T2) C: (T1 – T2)/T1 D: (T1 – T2)/T2

Q94 : Which of the following is not correct for a reversible adiabatic process ?

A: TVγ-1 = constant B: p1-γ.TY = constant C: PVγ = constant D: None of these

Q95 : 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: More acidic C: Neutral D: Of the same acidity

Q96 : Which of the following has the least (almost negligible) effect on the solubility of a solute in a solvent ?

A: Temperature B: Nature of solute C: Pressure D: Nature of solvent

Q97 : Hess’s law of constant heat summation is based on conservation of mass. It deals with ___________________?

A: Equilibrium constant B: Reaction rate C: Changes in heat of reaction D: None of these

Q98 : Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?

A: Work required to refrigeration obtained B: Refrigeration obtained to the work required C: Lower to higher temperature D: Higher to lower temperature

Q99 : Heat of solution in a system in which both solute and solvent are liquids is termed as_________________?

A: Heat of solvation B: Heat of hydration C: Standard integral heat of solution D: Heat of mixing

Q100 : Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg?

A: 80.38 B: 80 C: 79.62 D: 78.51

Free Chemical Engineering MCQs Mock Test Online with Answers

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