Stoichiometry

Thermal diffusivity of a refractory brick is high, when its ______________ is high?

Byadmin March 4, 2019August 24, 2021

Thermal diffusivity of a refractory brick is high, when its ______________ is high?

A. Density
B. Specific heat
C. Thermal conductivity
D. None of these

Stoichiometry

The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?

The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?

A. 0.2
B. 0.1
C. 0.4
D. 0.6

Read More The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ?
Stoichiometry

Thermal conductivity of refractory bricks____________________?

Thermal conductivity of refractory bricks____________________?

A. Increases with decrease in porosity
B. Decreases with decreases in porosity
C. Is independent of its porosity and is maximum for insulating bricks
D. Increases with the amount of air entrapped in pores

Read More Thermal conductivity of refractory bricks____________________?
Stoichiometry

Which of the following holds good for a solution obeying Raoult’s law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing) ?

Which of the following holds good for a solution obeying Raoult’s law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing) ?

A. ΔH = 1 (+ ve) and Δ V = -ve
B. ΔH = 0
C. ΔV = 0
D. Both B. and C.

Read More Which of the following holds good for a solution obeying Raoult’s law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing) ?
Stoichiometry

Pick out the wrong unit conversion of heat transfer co-efficient?

Pick out the wrong unit conversion of heat transfer co-efficient?

A. 1 kcal/m2.hr.°C = 0.2048 BTU/ft2.hr. °F. = 1.163 W/m2.°K
B. 1 kcal/m2.hr.°K = 1.163 W/m2.°C
C. 1 W/m2.°C = 0.1761 BTU/ft2.hr.°F.
D. 1 BTU/ft2.hr.°F = 4.88 kcal/m2.hr.°C = 20.44 kJ/m2.hr°C = 5.678 W/m2.°C

Read More Pick out the wrong unit conversion of heat transfer co-efficient?
Stoichiometry

Lower wall courses of soaking pits are made of _____________ bricks to avoid the action of molten slag & scale?

Lower wall courses of soaking pits are made of _____________ bricks to avoid the action of molten slag & scale?

A. Chrome or magnesite
B. Silicon carbide
C. Silica
D. Low duty fireclay

Read More Lower wall courses of soaking pits are made of _____________ bricks to avoid the action of molten slag & scale?
Stoichiometry

Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

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

Read More Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

Similar Posts