The vapor pressure of liquids of similar chemical nature at any particular temperature _______________ with increase in the molecular weight?
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) Either
A chemical process is said to occur under unsteady state, if the_________________?
(A) Inventory changes do not take place
(B) Ratio of streams entering/leaving are independent of time
(C) Flow rates & composition both are time dependent
(D) None of these
N.T.P. corresponds to__________________?
(A) 1 atm absolute pressure & 0°C
(B) 760 mm Hg gauge pressure & 0°C
(C) 760 torr & 15°C
(D) 101.325 KPa gauge pressure & 0°C
According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?
(A) No component is concentrated at the surface of the solution
(B) The component molecules are non polar and are of almost equal size
(C) In the formation of solution, chemical combination/molecular association between unlike molecules takes place
(D) The attractive forces between like and unlike molecules are almost equal
The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be______________?
(A) Basic
(B) More acidic
(C) Neutral
(D) Of the same acidity
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?
(A) Measures the elevation in boiling point
(B) Is not dependent on the temperature
(C) Is a function of the liquid phase composition
(D) Measures the depression in freezing point
Size range of the colloids particles is __________________?
(A) 5 – 200 milli-microns
(B) 50 – 200 microns
(C) 500 – 1000 microns
(D) 10 – 50 Angstrom
Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to – 100°C is ____________________?
(A) 10.73 kJ
(B) 16.15 kJ
(C) 18.11 kJ
(D) 18.33 kJ
1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?
(A) 5
(B) 10
(C) 15
(D) 20