chemical engineering stoichiometry MCQs – Page 9

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 Review each marked answer and report any item that may be outdated or unclear.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

161. The reverse process of fractional crystallisation is called__________________?
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A. Absorption

B. Leaching

C. Stripping

D. Differential distillation

162. Hot metal runner in blast furnace are lined with ______________ bricks?
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A. Fireclay

B. Silica

C. Magnesite

D. Carborundum

163. API gravity of water at N.T.P. is about__________________?
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A. 0

B. 1

C. 100

D. 10

164. One Newton is equal to ______________ dynes?
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A. 105

B. 102

C. 104

D. 103

165. Sometimes, in chemical processes, a part of the outlet stream is rejected as waste in order to keep the impurity level in the system within limits. This phenomenon is termed as the_________________?
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A. Bypassing

B. Recirculation

C. Recycling

D. Purging

166. An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?
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A. Cork

B. Sand

C. Saw dust

D. Chemically prepared foam

167. Applicability of Clausius-Clapeyron Equation is subject to the condition that the __________________?
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A. Vapor follows ideal gas law

B. Volume in the liquid state is negligible

C. Both A. & B.

D. Neither A. nor B.

168. Presence of MgO in alumino-silicate refractories ______________ its refractoriness ?
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A. Lowers

B. Does not affect

C. Increases

D. Either A. or B.; depends on its quantity

169. The crystallisation of a solute from a solution may be done by________________?
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A. All A., B. & C.

B. Removal of pure solvent by evaporation

C. Change of temperature thereby causing super-saturation

D. Changing the nature of the system by the addition of a more soluble material

170. Pick out the wrong statement?
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A. Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong

B. The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist

C. Generally, the heat capacities of compounds are lower in the liquid than in the solid state

D. Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state

171. Othmer chart is useful in estimating the heat of_______________?
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A. None of these

B. Mixing

C. Adsorption

D. Wetting

172. Chemically, mullite refractories is________________?
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A. ThO2

B. 3Al2O3.2SiO2

C. Al2O3

D. ZrSO4

173. 2 litres of nitrogen at N.T.P. weighs ______________ gms ?
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A. 2.5