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
121. Which is a neutral refractory ?
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A. Graphite

B. Magnesia

C. Magnesite chrome

D. Silica

122. A vapor whose partial pressure is less than its equilibrium vapor pressure is called a ______________ vapor?
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A. Supersaturated

B. Saturated

C. None of these

D. Superheated
123. The value of the gas-law constant R is 1.987 ?
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A. kcal/kg-mole.C

B. Btu/lb-mole.R

C. kcal/kg-mole.K

D. Both B. & C.
124. Refractory bricks with lower permeability is produced by using _________________?
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A. Finer grog size

B. All A., B. and C.

C. Higher firing temperature

D. Higher moulding pressure

125. For a reaction, X ? Y, if the concentration of X is tripled; the rate becomes nine times. The order of reaction is__________________?
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A. 0

B. 3

C. 2

D. 1

126. The evaporation of aqueous solution of sugar causes its molarity to__________________?
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A. Remain unchanged

B. Decrease

C. Increase

D. Either A. or B.; depends on the concentration of the solution

127. Thermal diffusivity of a refractory brick is high, when its ______________ is high?
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A. Density

B. Thermal conductivity

C. None of these

D. Specific heat

128. 1 BTU/lb.?F is equivalent to ____________ kcal/kg.C?
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A. 1

B. 4.97

C. 2.42

D. 1.987

129. Pick out the wrong unit conversion of thermal conductivity ?
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A. 1 BTU/ft2.hr.F/inch = 1.488 kcal/m2. hr.C/m

B. 1 BTU/ft2.hr.F/ft = 1.488 kcal/m2. hr.C/m

C. 1 W/cm.C = 85.985 kcal/m.hr.C = 57.779 BTU/ft.hr.F

D. 1 kcal/m.hr.C = 0.672 BTU/ft.hr.F = 1.163 W/m. K

130. The number of atoms of oxygen present in 11.2 litres of ozone (O3) at N.T.P. are__________________?
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A. 6.02 1023

B. 9.03 1024

C. 1.20 1024

D. 3.01 1022

131. Which of the following expressions defines the Baume gravity scale for liquids lighter than water ?
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A. Be = 145 (145/G)

B. Be = (400/G) 400

C. Be = (140/G) 130

D. Be = 200(G-1)

132. The atomic heat capacities of all solid elements ______________ with decrease in temperature?
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A. Increases

B. Remains unchanged

C. Decreases

D. Approach zero at 0C

133. In case of a solution (not of a solid in a liquid), whose total volume is less than the sum of the volumes of its components in their pure states, solubility is__________________?
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A. Unchanged with pressure changes

B. Independent of temperature

C. Increases with rise in pressure

D. Increased with decrease in pressure

134. The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies________________?
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A. XM = 0.5

B. XM < 0.5

C. 0.5 < XM < 0.64

D. XM ? 0.64
135. Which is an acidic refractory ?
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A. Magnesite

B. Dolomite

C. Fireclay

D. Chrome magnesite

136. Water content in ground refractory material to be shaped into bricks by hand moulding is about _____________ percent?
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A. 55

B. 40

C. 5

D. 20
137. Pure aniline is evaporating through a stagnant air film of 1 mm thickness at 300 K and a total pressure of 100 KPa. The vapor pressure of aniline at 300 K is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3. The diffusivity of aniline in air is 0.74 10-5m2/s. The numerical value of mass transfer co-efficient is 7.4 10-3. Its units are_______________________?
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A. mole/m2.s.Pa

B. m/s

C. cm/s

D. k.mole/m2.s.Pa

138. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _____________ C for 24 hours?
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A. 700

B. 1600

C. 1000

D. 2000

139. 1 BTU/ft3 is approximately equal to _____________ kcal/m3?
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A. 1

B. 9

C. 252

D. 4

140. Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the______________________?
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A. Elevation in boiling point in the ratio of their molecular weights

B. Same elevation in boiling point

C. None of these

D. Different elevation in boiling point

141. A gas occupies a volume of 283 c.c at 10C. If it is heated to 20C at constant pressure, the new volume of the gas will be __________ c.c?
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A. 566

B. 283

C. 141.5

D. 293
142. Measurement of the amount of dry gas collected over water from volume of moist gas is based on the___________________?
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A. Charles law

B. Daltons law of partial pressures

C. Boyles law

D. Avogadros hypothesis

143. Internal energy of a substance comprises of the _____________ energy?
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A. Translational

B. Vibrational

C. All A., B. & C.

D. Rotational

144. Pure oxide refractories are generally monocrystalline in nature and are self bonded ______________ bricks are generally used as moderator in nuclear reactors?
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A. Thoria

B. Carborundum

C. Beryllia

D. Corundum

145. Dissolving a solute in a solvent does not change its________________?
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A. Specific heat

B. Vapour pressure

C. None of these

D. Viscosity

146. Heat of ____________ of a fuel is called its calorific value?
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A. Combustion

B. Vaporisation

C. Reaction

D. Formation

147. Cp equals Cv at________________?
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A. 0C

B. 0R

C. 0K

D. 0F

148. The heat evolved in the combustion of benzene is represented by the equation: C6H6 + 7.5 O2 = 6CO2 + 3H2O, ?H = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C6H6 is burnt in an open container, will be _____________ kJ/kgmole?
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A. -1632.3

B. -2448.45

C. 816.15

D. 1632.3

149. Refractoriness/fusion points of Superduty refractories is _____________ C?
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A. > 2000

B. 1630-1670

C. > 1730

D. 1520-1630

150. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of ________________?
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A. Corundum

B. Siliceous fireclay

C. Fireclay

D. Silicon carbide