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Question Bank

Question for NALCO Manager Chemical - Quiz / Questions / MCQ in English

Last Update on : October 11, 2026

Duration: 90 · Questions: 100 · Max Marks: 100

View NALCO Manager (Chemical) 2026 Exam Page

To boost your performance in NALCO Manager Chemical exam, practice each question regularly and with focus. Every question tests your subject understanding, so solve them one at a time. Taking a quiz improves your speed and accuracy. Practicing topic-wise MCQs. Students benefit greatly from reviewing questions with answer keys, which help clarify concepts and strengthen Questions knowledge for success in NALCO Manager Chemical exams.

Latest NALCO Manager Chemical Exam Question (Objective Questions), MCQ in English

Subjects : Domain Knowledge (Chemical Engineering), General Aptitude

Question Bank NALCO Manager (Chemical) Exam - English

Domain Knowledge (Chemical Engineering)

Q 1 :
Stoichiometry is primarily concerned with?
  1. A.Quantitative relationship between reactants and products
  2. B.Physical properties of substances
  3. C.Thermodynamic equilibrium only
  4. D.Molecular spectroscopy
Q 2 :
The law of conservation of mass states that?
  1. A.Mass can be created from energy
  2. B.Mass is neither created nor destroyed in a chemical reaction
  3. C.Mass is converted into work
  4. D.Mass decreases during reaction
Q 3 :
A limiting reactant in a reaction is?
  1. A.The catalyst used in reaction
  2. B.The reactant in excess
  3. C.The reactant that gets completely consumed first
  4. D.None of the above
Q 4 :
The stoichiometric coefficient represents?
  1. A.Molecular weight of a substance
  2. B.Number of moles of a species in a reaction
  3. C.Reaction rate constant
  4. D.Temperature of reaction
Q 5 :
In a chemical reaction, the mole ratio is?
  1. A.Ratio of moles of reactants or products as per balanced equation
  2. B.Ratio of molecular weights
  3. C.Ratio of volumes only
  4. D.Ratio of concentrations
Q 6 :
The concept of equivalent weight is used to?
  1. A.Relate masses of reactants and products in chemical reactions
  2. B.Measure reaction rate
  3. C.Determine pressure
  4. D.Measure temperature
Q 7 :
The stoichiometric balance ensures?
  1. A.Mass and atoms are conserved
  2. B.Only mass is conserved
  3. C.Only energy is conserved
  4. D.Volume is conserved
Q 8 :
Excess reactant in a reaction?
  1. A.Reacts completely
  2. B.Remains unreacted after reaction completion
  3. C.Acts as catalyst
  4. D.Converts to heat
Q 9 :
Theoretical yield refers to?
  1. A.Actual product obtained
  2. B.Maximum amount of product possible based on stoichiometry
  3. C.Product lost in reaction
  4. D.Yield including impurities
Q 10 :
Actual yield is?
  1. A.The amount of product obtained experimentally
  2. B.Maximum theoretical product
  3. C.Yield of reactant
  4. D.Amount of catalyst used
Q 11 :
Percentage yield is calculated as?
  1. A.(Theoretical yield / Actual yield) × 100
  2. B.(Actual yield / Theoretical yield) × 100
  3. C.(Reactant used / Product forme
  4. D.× 100
Q 12 :
In stoichiometry, a catalyst is?
  1. A.Substance that increases reaction rate without being consumed
  2. B.Limiting reactant
  3. C.Product formed
  4. D.Reactant in excess
Q 13 :
The term “mole fraction” is?
  1. A.None of the above
  2. B.Ratio of mass to molar mass
  3. C.Ratio of volume to pressure
  4. D.Ratio of moles of a component to total moles in mixture
Q 14 :
In a chemical reaction, mass of product is calculated using?
  1. A.Pressure × Volume
  2. B.Volume × Density
  3. C.Moles × Molar mass
  4. D.Temperature × Pressure
Q 15 :
The concept of limiting reagent helps to?
  1. A.Calculate pressure
  2. B.Determine reaction rate only
  3. C.Measure temperature
  4. D.Determine maximum product formation
Q 16 :
In chemical engineering, stoichiometry is essential for?
  1. A.Typing speed
  2. B.Designing reactors and material balances
  3. C.Array sorting
  4. D.Only lab experiments
Q 17 :
The degree of completion of a reaction is called?
  1. A.Conversion
  2. B.Yield
  3. C.Mole fraction
  4. D.None of the above
Q 18 :
In a batch reactor, stoichiometry helps to?
  1. A.Calculate required reactants and expected products
  2. B.Determine temperature only
  3. C.Measure pressure only
  4. D.Control pump speed
Q 19 :
The mole concept relates?
  1. A.Temperature to reaction rate
  2. B.Pressure to volume
  3. C.Mass of substance to number of particles
  4. D.Energy to mass
Q 20 :
In gas-phase reactions, stoichiometry can be expressed in terms of?
  1. A.Temperature only
  2. B.Mass only
  3. C.Energy only
  4. D.Volume ratios at same temperature and pressure
Q 21 :
For a reaction, the sum of reactants’ and products’ moles multiplied by molar mass gives?
  1. A.Rate law
  2. B.Energy balance
  3. C.Mass balance
  4. D.Equilibrium constant
Q 22 :
The stoichiometric number of a reactant is?
  1. A.Always one
  2. B.Positive
  3. C.Zero
  4. D.Negative in balanced chemical equation
Q 23 :
The stoichiometric number of a product is?
  1. A.Negative
  2. B.Positive in balanced chemical equation
  3. C.Zero
  4. D.None of the above
Q 24 :
In chemical reactions, molar mass is used to convert?
  1. A.Temperature and energy
  2. B.Volume and pressure
  3. C.Between moles and grams
  4. D.Rate and concentration
Q 25 :
Limiting reagent determines?
  1. A.Pressure only
  2. B.Reaction temperature
  3. C.Maximum amount of product
  4. D.Reaction rate
Q 26 :
A balanced chemical equation is necessary to?
  1. A.Calculate density
  2. B.Measure temperature
  3. C.Determine pressure only
  4. D.Perform stoichiometric calculations accurately
Q 27 :
Mole fraction is always?
  1. A.Greater than 1
  2. B.Between 0 and 1
  3. C.Negative
  4. D.Equal to 100
Q 28 :
Percent excess of reactant is calculated by?
  1. A.(Moles of product / Total moles) × 100
  2. B.(Actual yield / Theoretical yield) × 100
  3. C.(Excess / Stoichiometric requirement) × 100
  4. D.None of the above
Q 29 :
The theoretical amount of a product is determined by?
  1. A.Catalyst
  2. B.Temperature only
  3. C.Pressure only
  4. D.Limiting reactant and stoichiometry
Q 30 :
The relationship between reactants and products is given by?
  1. A.Balanced chemical equation
  2. B.Phase diagram
  3. C.Titration curve
  4. D.Reaction coordinate
Q 31 :
In stoichiometry, 1 mole of any gas at STP occupies?
  1. A.25 liters
  2. B.24 liters
  3. C.20 liters
  4. D.22.4 liters
Q 32 :
The concept of stoichiometry is applied in?
  1. A.Array sorting
  2. B.Typing practice
  3. C.Only lab experiments
  4. D.Reactor design and process calculations
Q 33 :
Material balance in chemical engineering is based on?
  1. A.Law of thermodynamics only
  2. B.Law of conservation of mass
  3. C.Kinetic theory
  4. D.Ideal gas law
Q 34 :
The first law of thermodynamics states?
  1. A.Heat cannot flow spontaneously
  2. B.Entropy always increases
  3. C.Energy cannot be created or destroyed, only transformed
  4. D.Energy is inversely proportional to temperature
Q 35 :
Enthalpy (H) is defined as?
  1. A.H = PV – U
  2. B.H = U – PV
  3. C.H = U + PV
  4. D.H = U × PV
Q 36 :
Internal energy (U) of a system depends on?
  1. A.Only volume
  2. B.Only pressure
  3. C.Temperature, pressure, and phase of the substance
  4. D.Only concentration
Q 37 :
The second law of thermodynamics states?
  1. A.Entropy of an isolated system never decreases
  2. B.Energy can be created
  3. C.Work is independent of heat
  4. D.Enthalpy is constant
Q 38 :
Gibbs free energy (G) is used to predict?
  1. A.Work done only
  2. B.Reaction rate only
  3. C.Spontaneity of a process at constant temperature and pressure
  4. D.Enthalpy change
Q 39 :
Entropy (S) is a measure of?
  1. A.Disorder or randomness in a system
  2. B.Energy content
  3. C.Pressure-volume work
  4. D.Temperature only
Q 40 :
For an ideal gas, the internal energy depends on?
  1. A.Temperature only
  2. B.Pressure only
  3. C.Volume only
  4. D.Both pressure and volume
Q 41 :
The heat capacity at constant pressure (Cp) is?
  1. A.Ratio of pressure to volume
  2. B.At constant volume
  3. C.Amount of heat required to raise temperature by 1 K at constant pressure
  4. D.Enthalpy per mole
Q 42 :
The heat capacity at constant volume (Cv) is?
  1. A.Internal energy per mole
  2. B.At constant pressure
  3. C.Enthalpy per mole
  4. D.Amount of heat required to raise temperature by 1 K at constant volume
Q 43 :
For an ideal gas, the relation between Cp and Cv is?
  1. A.Cp × Cv = R
  2. B.Cp + Cv = R
  3. C.Cp – Cv = R
  4. D.Cp / Cv = R
Q 44 :
Helmholtz free energy (A) is defined as?
  1. A.A = U – TS
  2. B.A = H – TS
  3. C.A = G + TS
  4. D.A = PV – U
Q 45 :
A reversible process is one that?
  1. A.Occurs spontaneously
  2. B.Can be reversed without leaving any change in the system or surroundings
  3. C.Increases entropy only
  4. D.Is irreversible
Q 46 :
An irreversible process is characterized by?
  1. A.No entropy change
  2. B.Increase in entropy of universe
  3. C.Decrease in energy
  4. D.Constant enthalpy
Q 47 :
Standard enthalpy of formation is?
  1. A.Enthalpy change when 1 mole of a compound is formed from its elements in standard state
  2. B.Heat of combustion
  3. C.Enthalpy of reaction at any condition
  4. D.Entropy change
Q 48 :
For an isolated system, the total entropy change for a spontaneous process is?
  1. A.Positive
  2. B.Negative
  3. C.Zero
  4. D.Infinite
Q 49 :
The relation between Gibbs free energy and enthalpy and entropy is?
  1. A.G = U – TS
  2. B.G = H – TS
  3. C.G = H + TS
  4. D.G = U + PV
Q 50 :
In an adiabatic process, the heat transfer (Q) is?
  1. A.Zero
  2. B.Positive
  3. C.Negative
  4. D.Equal to work done

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