chemical engineering stoichiometry MCQs – Page 6

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 Review each marked answer and report any item that may be outdated or unclear.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

101. The heat change for the reaction, C(s) + 2S(s) ? CS2(l), is 104.2 kJ. It represents the heat of_________________?
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A. Combustion

B. Solution

C. Fusion

D. Formation

102. The increase in the temperature of the aqueous solution will result in decrease of its________________?
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A. Molarity

B. Weight % of the solute

C. Mole fraction of the solute

D. Molality

103. At standard conditions, N2 + 2O2 ? 2NO2; ?G = 100 kJ/mole NO + O2 ? 2NO2; ?G = -35 kJ/mole The standard free energy of formation of NO in kJ/mole is___________________?
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A. 170

B. 15

C. 85

D. 30

104. Which of the following is insensitive to changes in pressure ?
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A. Heat of vaporisation

B. Melting point

C. Heat of fusion

D. Both B. and C.

105. Avogadro number is the number of molecules in one ____________ of a gas?
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A. Litre

B. gm.mole

C. gram

D. Kilogram

106. The heat of adsorption of a gas caused by Van der Waals forces of attraction and capillarity is equal to the heat of__________________?
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A. Sum of A. and B.

B. Wetting

C. Difference of A. and B.

D. Normal condensation

107. The value of Troutons ratio (?b/Tb) for a number of substances is 21 (where, ?b = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, K). The Kistyakowsky equation is used for calculation of Troutons ratio of _____________ liquids?
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A. Polar

B. Non-polar

C. Both A. & B.

D. Neither A. nor B.

108. Quartz is__________________?
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A. Transformed to Cristobalite on heating above 1470C

B. All A., B. and C.

C. Converted to Tridymite on firing between 870 to 1470C

D. Stable form of silica upto 870C

109. One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH4 + 2O2 ? CO2 + 2H2O. Both the reactants and products are in gas phase. ?H298 = 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about_____________________?
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A. 0.33

B. 0.19

C. 0.4

D. 0.67

110. The vapor pressure of liquids (having similar chemical nature) at any specified temperature ______________ with increasing molecular weight?
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A. Increases

B. Remains unchanged

C. Increases linearly

D. Decreases

111. In the reaction, represented by Na2CO3 + HC1 ? NaHO3 + NaCl, the equivalent weight of Na2CO3 is________________?
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A. 53

B. 106

C. 10.6

D. 5.3

112. Magnesite refractories are used for the construction of those furnaces, which are_______________?
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A. Not required to resist the corrosive action of basic slag

B. Not subjected to fluctuation in temperature

C. Used for raising & maintaining high temperature

D. Both B. and C.

113. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?
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A. CO attack

B. Slag attack

C. Thermal spalling

D. Fusion under load

114. High porosity refractory bricks have________________?
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A. Poor resistance to the penetration of molten slag, metal & flue gases

B. All A., B. and C.

C. Better thermal spalling resistance

D. Poor heat conductivity & low strength

115. A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of ________________?
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A. 1000

B. None of these

C. 3

D. 100

116. Which of the following expressions defines the Baume gravity scale for liquids heavier than water ?
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A. (141.5/G) 131.5

B. 200 (G-1)

C. 145 (145/G)

D. (400/G) 400

117. Molality is defined as the number of gm moles of solute per _____________ of solvent?
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A. kg

B. Litre

C. gm

D. gm.mole

118. Saturated molal absolute humidity of the vapor-gas mixture depends upon the______________________?
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A. Vapor pressure at dry bulb temperature

B. Total pressure

C. Both A. and B.

D. Neither A. nor B.

119. Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the corresponding states. At equal reduced conditions i.e., at the corresponding state, the ____________ of different gases are nearly the same?
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A. Compressibility

B. Humidity

C. Molecular weight

D. None of these

120. Fireclay bricks is not used for lining the_______________?
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A. Gas producer

B. Cupola

C. Roof of open hearth furnace

D. Bottom of hot metal mixer

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