chemical engineering stoichiometry MCQs

Practise multiple-choice questions from chemical engineering stoichiometry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering stoichiometry Mcqs
1. A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is_________________?
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A. None of these

B. N2O4

C. N2O3

D. N2O5
2. Thermal conductivity of refractory bricks____________________?
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A. Is independent of its porosity and is maximum for insulating bricks

B. Increases with decrease in porosity

C. Decreases with decreases in porosity

D. Increases with the amount of air entrapped in pores

3. Which property of refractories is the most important for top section of the blast furnace ?
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A. Resistance to slag penetration

B. Stability of volume at high temperature

C. Resistance to abrasion
4. Raoults law is obeyed by a _____________ solution?
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A. Saturated

B. Molar

C. Normal

D. None of these
5. In physical adsorption, as compared to chemisorption, the________________________?
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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

6. The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the___________________?
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A. Kistyakowsky equation

B. Kopps rule

C. Antoine equation

D. Troutons rule

7. A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?
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A. 140

B. 345

C. 350

D. 485

8. In case of vapor-liquid equilibria, which of the following does not account for gas phase deviation from ideality ?
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A. Fugacity co-efficient

B. Activity co-efficient

C. None of these

D. Use of equation of state

9. The maximum adiabatic flame temperature of fuels in air is ____________ the maximum flame temperature in pure oxygen?
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A. Lower than

B. Higher than

C. Same as

D. Not related to

10. One of the specific gravity scales is Brix (used specifically for sugar solution). It is defined as ______________?
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A. Brix = (400/G) 400

B. Brix = 145 (145/G)

C. Brix = 200 (G-1)

D. None of these

11. Pick out the wrong unit conversion of heat transfer rate?
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A. 1 kcal/hr= 1.163 Watt

B. 1 kcal/m2.hr = 0.3687 BTU/ft2.hr = 1.163 Watt/m2

C. 1 Watt = 1.163 kcal/hr

D. 1 BTU/ft2.hr = 2.712 kcal/m2.hr

12. Isotonic solutions must have the same__________________?
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A. Normality

B. Critical temperature

C. Molar concentration

D. Viscosity

13. Viscosity of atmospheric air may be about _____________ centipoise?
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A. 0.015

B. 150

C. 1.5

D. 15

14. Fireclay bricks are used in the______________?
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A. Coke ovens regenerator

B. Coke oven walls

C. Outer lining of L.D. converter

D. Hearth bottom of blast furnace

15. On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes_________________?
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A. 8

B. 2

C. 4

D. 1

16. The hydroxyl ion (OH-) concentration in a solution having pH value 3 will be_________________?
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A. 3-Oct

B. 10-Oct

C. 4-Oct

D. 10-11
17. The number of H+ in 1 c.c solution of pH 13 is__________________?
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A. 6.023 1013

B. 6.023 107

C. 1013

D. 6.023 1010

18. Fireclay bricks are not used in the_________________?
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A. Wall of coke oven

B. Hot blast stove

C. Blast furnace

D. Cupola

19. Kinematic viscosity of 1 m2 /second is equivalent to _____________ stokes?
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A. 10

B. 103

C. 104

D. 102

20. The rate of material _____________ is zero in case of a steady state system?
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A. Generation

B. Accumulation

C. Production

D. Input

21. Solutions having the same osmotic pressure are called _____________ solutions?
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A. Saturated

B. Dilute

C. Isotonic

D. Ideal

22. Kopps rule is concerned with the calculation of__________________?
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A. Surface tension

B. Thermal conductivity

C. Heat capacity

D. Viscosity

23. Pick out the wrong statement?
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A. For reducing spalling tendency, the refractory should be well fired and its porosity should be more

B. Refractoriness under load (RUL) of a refractory is always less than its refractoriness

C. The electrical resistivity of refractories drops rapidly with rise in temperature

D. Refractories used in muffle furnace should have low thermal conductivity
24. A solution with reasonably permanent pH is called a/an _______________ solution?
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A. Non-ideal

B. Colloidal

C. Ideal

D. Buffer
25. Enthalpy of a vapor gas mixture may be increased by increasing the________________?
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A. Humidity at constant temperature

B. Temperature and the humidity

C. All A., B. & C.

D. Temperature at constant humidity

26. Pick out the wrong statement?
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A. The temperature at which a vapor is saturated is termed as the boiling point

B. The difference between the existing temperature of a vapor and its saturation temperature (i.e.dew point) is called its degree of superheat

C. A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a superheated vapor

D. A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure

27. For an ideal solution, the total vapor pressure varies _____________ with the composition (expressed as mole fraction)?
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A. Exponentially

B. Linearly

C. Inversely

D. Negligibly

28. 40 gms each of the methane and oxygen are mixed in an empty container maintained at 40C. The fraction of the total pressure exerted by oxygen is_________________?
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A. 4-Jan

B. 3-Feb

C. 1/3

D. 2-Jan

29. Panel test determines the ______________ of refractories?
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A. Spalling resistance

B. Refractoriness under load (RUL)

C. Slag penetration resistance

D. Fusion point

30. A vapor that exists above its critical temperature is termed as a _____________ vapor?
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A. Sub-cooled

B. Unsaturated

C. Gaseous

D. Saturated

31. Kopps rule is helpful in finding the__________________?
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A. Heat capacities of gases

B. Activation energy

C. Molal heat capacities of gases

D. Heat capacities of solids
32. Refractory bricks having lower porosity have _____________________?
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A. Low heat capacity

B. Low thermal conductivity

C. Greater strength

D. High insulating properties

33. Roof of a basic electric furnace is made of ______________ bricks?
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A. Superduty fireclay

B. Silica

C. Chromite

D. None of these

34. For estimation of heat capacity of a solid compound, one can use________________?
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A. Clapeyrons equation

B. Troutons rule

C. Kopps rule

D. Gibbs equation

35. Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution_____________________?
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A. A2 is more alkaline than solution A2

B. A1 is highly acidic

C. A1 is very slightly acidic

D. Both A. & C.
36. An Azeotropic solution of two liquids has boiling point lower than either of them, when it_____________?
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A. Is unsaturated

B. Shows positive deviation from Raoults law

C. Shows negative deviation from Raoults law

D. Is saturated

37. Refractories used in/for ______________ should have low thermal conductivity?
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A. Insulation

B. Coke ovens

C. Regenerators

D. Muffle furnaces

38. Which equation is not an equation of state ?
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A. (P + a/V2)(V-b) = RT

B. p = [RT/(V b)] (a/TV2)

C. loge (p/p0) = (?/R) (1/T0 1/T)

D. PV = RT + B/V + y/V2 + .

39. What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100C, if their vapor pressures at 100C are 1340, 560 and 210 mmHg respectively ?
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A. 780.5

B. 880.5

C. 801.5

D. 756.2

40. Which of the following gases is the most soluble in water ?
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A. CH4

B. CO2

C. NH3

D. H2S

41. Dry air is a mixture of__________________?
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A. Vapors

B. Gases

C. Both A. & B.

D. Neither A. nor B.

42. 1 bar is almost equal to __________________________ atmosphere?
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A. 1

B. 1000

C. 10

D. 100

43. A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.15 gm of the oxide has yielded 1.05 gm of the metal. It may be inferred that the ____________________?
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A. Atomic weight of the metal is 2

B. Equivalent weight of the metal is 8

C. Equivalent weight of the metal is 4

D. Atomic weight of the metal is 4

44. The pressure of V litres of a dry gas is increased from 1 to 2 kgf/cm2 at a constant temperature. The new volume will become___________________?
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A. V2

B. V/2

C. 2V

D. V/4

45. The reaction A + B ? C has been conducted in a reactor as shown below. The numbers of balances (material) that can be made around the reactor are________________?
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A. 2

B. 3

C. 1

D. 4

46. The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg.mole respectively. The order of decreasing inter-molecular forces in these liquids is________________?
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A. CS2 > H2O > C2H5OH

B. CS2 > C2H5OH > H2O

C. H2O > CS2 > C2H5OH

D. H2O > C2H5OH > CS2
47. Which of the following ideal gas laws are not applicable to mixture of gases ?
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A. Amagats law

B. Daltons law

C. Boyles law & Charles Law

D. None of these

48. At 100C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100C, 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 150C is 4.69 atm. At 150C, the vapour pressure of methylcyclohexane would be expected to be_________________?
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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

49. An equation for calculating vapour pressure is given by, log10 P = A B(t + c). This is called the________________?
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A. Kopps rule

B. Kistyakowsky equation

C. Antoine equation

D. Troutons rule

50. Osmotic pressure of a dilute solution of a non volatile solute in a solvent obeying Raoults law is proportional to the_____________?
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A. Temperature

B. Volume of solution

C. None of these

D. Moles of non-volatile solute