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.Management Sciences
Category: Stoichiometry
Boiling point of a non-homogeneous mixture of immiscible liquids is _____________ that of any one of its separate components?
A. Lower than
B. Higher than
C. Equal to
D. Either A. or B.; depends on the liquids
Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?
A. log (1/H+)
B. – log (1/H+)
C. 1/log H+
D. None of these
The most convenient way of expressing solution concentration is in terms of___________________?
A. Mole fraction
B. Normality
C. Molality
D. Molarity
Isotonic solutions must have the same__________________?
A. Viscosity
B. Molar concentration
C. Normality
D. Critical temperature
Pick out the wrong statement?
A. Refractories used in muffle furnace should have low thermal conductivity
B. The electrical resistivity of refractories drops rapidly with rise in temperature
C. For reducing spalling tendency, the refractory should be well fired and its porosity should be more
D. Refractoriness under load (RUL) of a refractory is always less than its refractoriness
Which of the following is an exothermic reaction ?
A. Conversion of graphite to diamond
B. Decomposition of water
C. Dehydrogenation of ethane to ethylene
D. None of these
Outer combustion chamber of blast furnace stove is lined with _______________ bricks?
A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia
A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal______________?
A. Kinetic energy
B. Intermolecular forces of attraction
C. Potential energy
D. Total energy
Permeability of bricks is a measure of the___________________?
A. Refractoriness
B. Melting point
C. Rate at which a fluid will pass through the pores
D. Expansion during heating
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