Stoichiometry
The density of a gas at N.T.P.is 'ρ'. Keeping the pressure constant (i.e. 760 mm Hg), the 3 density of the gas will become ¾ 0.75ρ at a temperature of __________ °K

400°
300°
300°
273°

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

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

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Stoichiometry
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.

No component is concentrated at the surface of the solution
In the formation of solution, chemical combination/molecular association between unlike molecules takes place
The attractive forces between like and unlike molecules are almost equal
The component molecules are non polar and are of almost equal size

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