Q.1
The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface. This statement pertaining to the solubility of gases in liquid is the __________ law.
Q.2
Heat of reaction is not influenced by
Q.3
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules
Q.4
One Newton is equal to __________ dynes.
Q.5
Pick out the wrong statement.
Q.6
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.?
Q.7
The density of a liquid is 1500 kg/m³. Its value in gin/litre will be equal to
Q.8
One mole of methane undergoes complete combustion in a stoichiometric amount of air. The reaction proceeds as CH₄ + 2O₂ → CO₂ + 2H₂O. Both the reactants and products are in gas phase. ΔH°298 = - 730 kJ/mole of methane. Mole fraction of water vapour in the product gases is about
Q.9
The boiling points for pure water and pure toluene are 100°C and 110.6°C respectively. Toluene and water are completely immiscible in each other. A well agitated equimolar mixture of toluene and water are prepared. If, at a total pressure of one standard atm. exerted by the vapours of water and toluene, the mole fraction of water Xw in the vapour phase satisfies
Q.10
The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour
Q.11
An ideal gas can be liquified, because
Q.12
A bypass stream in a chemical process is useful, because it
Q.13
An equation for calculating vapour pressure is given by, log10 P = A - B(t + c). This is called the
Q.14
2 litres of nitrogen at N.T.P. weighs __________ gms.
Q.15
Heat of transition is the heat evolved or absorbed, when a substance is converted from
Q.16
Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature?
Q.17
The value of the gas-law constant 'R' is 1.987
Q.18
The combustion equations of carbon and carbon monoxide are as follows:
C + O₂ = CO₂, ΔH = - 394 kJ/kg . mole CO + 1/2 O₂ = CO₂, ΔH = - 284.5 kJ/kg. mole.
The heat of formation of CO is __________ kJ/kg. mole.
Q.19
In case of a ternery system involving two liquid components and a solute, the ratio of the concentration of the solute in the two phases at equilibrium is called the distribution co-efficient. The distribution co-efficient depends upon the
Q.20
__________ fuels require the maximum percentage of 'excess air' for complete combustion.
Q.21
Atomic __________ of an element is a whole number.
Q.22
If pH value of a solution is 8, then its pOH value will be
Q.23
A sample of well water contains 140 gm/m³ Ca²⁺ ions and 345 gm/m³ Na⁺ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO₃ in gm/m³ is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16)
Q.24
Density of carbon dioxide is __________ kg/Nm³.
Q.25
Enthalpy change resulting, when unit mass of solid is wetted with sufficient liquid, so that further addition of liquid produces no additional thermal effect, is called the heat of
Q.26
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
Q.27
The vapour pressure of water is given by, in Psat = A - (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K.The vapor pressure of water in atm. at 50°C is approximately
Q.28
Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
Q.29
For estimation of heat capacity of a solid compound, one can use
Q.30
The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal __________ in the two phases.
Q.31
The total number of atoms in 8.5 gm of NH₃ is __________ x 1023.
Q.32
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 ) ?
Q.33
Dissolving a solute in a solvent does not change its
Q.34
Pick out the wrong statement.
Q.35
Number of gm moles of solute dissolved in 1 kg of solvent is called its
Q.36
Avogadro's number is equal to
Q.37
Enthalpy of a vapor gas mixture may be increased by increasing the
Q.38
The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the
Q.39
Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the
Q.40
Elements in a periodic table are arranged in order of their
Q.41
For an ideal gas, the compressibility factor
Q.42
Cv for monoatomic gases is equal to(where, R = gas constant)
Q.43
The equilibria relations in a multicom-ponent and multiphase system can not be calculated with the help of the
Q.44
What is the total pressure exerted by a mixture of 0.45 kg mole of benzene, 0.44 kg mole of toluene and 0.23 kg mole of o-xylene at 100°C, if their vapor pressures at 100°C are 1340, 560 and 210 mmHg respectively?
Q.45
In osmosis through a semi-permeable membrane, diffusion of the
Q.46
Isotonic solutions must have the same
Q.47
The heat capacity of most substances is greater for the __________ state.
Q.48
Addition of a non-volatile solute to a pure solvent
Q.49
The effect of pressure on the heat capacity of the gases __________ is negligible.
Q.50
Gases diffuse faster compared to liquids because of the reason that the liquid molecules
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