6751. 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
273°
300°
400°
300°
✅ The correct answer is option C.
Chemical Engineering
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6752. What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C?
2-Mar
1-Mar
1-Feb
L/3 x 298/273
✅ The correct answer is option B.
6753. Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the
Sizes of the component molecules are approximately equal
Attractive forces between like and unlike molecules are approximately equal
Component molecules are non-polar and no chemical combination or molecular association between unlike molecules takes place in the formation of the solution
All of the above
✅ The correct answer is option D.
6754. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is
2
1
0.5
0.5
✅ The correct answer is option C.
6755. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are PvB and Pvw respectively. The partial pressure of benzene in air-vapour mixture is
PvB
XB.PvB
(Patm – Pvw)xB
XB.Patm
✅ The correct answer is option B.
6756. The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the
Temperature & pressure
Number of intermediate chemical reactions involved
State of aggregation & the state of combination at the beginning & the end of the reaction
None of these
✅ The correct answer is option B.
6757. The rate of material __________ is zero in case of a steady state system.
Accumulation
Production
Input
Generation
✅ The correct answer is option A.
6759. A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is
N₂O₄
N₂O₅
N₂O₃
None of these
✅ The correct answer is option B.
6760. Increasing the temperature of an aqueous solution will cause decrease in its
Molality
Mole fraction
Weight percent
Molarity
✅ The correct answer is option D.