The net heat evolved or absorbed in a chemical process, i.e. total change in the enthalpy of the system is independent of the
Colligative properties of a dilute solution are those, which depend entirely upon the
Heat capacity of air can be approximately expressed as, Cp = 26.+ 7.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
In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the
Which of the following is an exothermic reaction ?
Pick out the wrong unit conversion of calorific value.
Increasing the temperature of an aqueous solution will cause decrease in its
The chemical nature of an element is independent of
If pH value of an acidic solution is decreased from 5 tothen the increase in its hydrogen ion concentration is __________ times.
Kopp's rule is concerned with the calculation of
Pick out the wrong statement.
The rate of material __________ is zero in case of a steady state system.
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
The vapor pressure of liquids of similar chemical nature at any particular temperature __________ with increase in the molecular weight.
The pressure of 'V' litres of a dry gas is increased from 1 to 2 kgf/cm2 at a constant temperature. The new volume will become
1 kg of calcium carbide (CaC2) produces about 0.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 burninglitres of gas at NTP per hour ?
N.T.P. corresponds to
Viscosity of atmospheric air may be about __________ centipoise.
In a binary liquid solution of components A and B, if component A exhibits positive deviation from Raoult's law, then component B
Gases diffuse faster compared to liquids because of the reason that the liquid molecules
Heat of solution in a system in which both solute and solvent are liquids is termed as
The heat change for the reaction, C(s) + 2S(s) → CS2(l), is 104.2 kJ. It represents the heat of
Density of carbon dioxide is __________ kg/Nm3.
Vapor pressure of water at 100°C is about __________ bar.
A metal oxide is reduced by heating it in a stream of hydrogen. After complete reduction, it is found that 3.gm of the oxide has yielded 1.gm of the metal. It may be inferred that the
gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is
Solution made by dissolving equimolar amounts of different solutes in the same amount of a given solvent will have the
N2 content in a urea sample was found to be only 42%. What is the actual urea content of the sample ? (molecular weight of urea = 60)
A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct ?
Heat of reaction is not influenced by
On addition of 1 c.c. of dilute hydrochloric acid (concentration) toc.c. of a buffer solution of pH =the pH of the solution becomes
The weight fraction of methanol in an aqueous solution is 0.The mole fraction of methanol XM satisfies
For an endothermic reaction, the minimum value of energy of activation will be (where, ΔH = enthalpy of the reaction)
Pick out the wrong statement:
One 'Therm' is equivalent to
Sodium __________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature.
The vapor pressure of liquids (having similar chemical nature) at any specified temperature __________ with increasing molecular weight.
1 torr is equivalent to
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.
During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.
The osmotic pressure of a solution increases, if its __________ is decreased.
Pure aniline is evaporating through a stagnant air film of 1 mm thickness atK and a total pressure ofKPa. The vapor pressure of aniline atK is 0.1 KPa. The total molar concentration under these conditions is 40.1 mole/m3 . The diffusivity of aniline in air is 0.74xl0-5m2/s.The numerical value of mass transfer co-efficient is 7.4 x 10-3. The rate of evaporation of aniline is 2.x 10-4. Its units are
Avogadro number is the number of molecules in one __________ of a gas.
Number of gram equivalent of solute dissolved in one litre of solution is called its
Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
A sample of well water containsgm/m3 Ca2+ ions andgm/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 :Na :C :O : 16)
At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be
A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is
Specific gravity on API scale is given by the relation(where, G = specific gravity at 15.5°C).
Please disable the adBlock and continue. Thank you.