Pick out the wrong statement.
A. Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong
B. Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state
C. Generally, the heat capacities of compounds are lower in the liquid than in the solid state
D. The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist
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'Cox' chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the
A. Temperature vs. log (vapor pressure)
B. Vapor pressure vs. log (temperature)
C. Log (temperature) vs. log (vapor pressure)
D. Vapor pressure vs. temperature
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pH value of a solution containing 1 gm of hydrogen ion per litre will be
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Weight of 56 litres of ammonia at N.T.P. is __________ gm.
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During a phase change process like sublimation, vaporisation, melting etc., the specific __________ does not change.
A. Enthalpy
B. Gibbs free energy
C. Internal energy
D. Entropy
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Pick out the correct statement.
A. Heat of solution is always positive
B. At equilibrium, ΔG is zero
C. For the reaction, PCl5 ⇋ PCl3 + Cl2 , ΔG is less than ΔE
D. The heating of water in a beaker is an example of an isolated system
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Pick out the correct statement.
A. A substance existing above its critical temperature is called a saturated vapor
B. A mixture of vapor gas is called saturated, if the equilibrium vapor pressure of the liquid is more than the partial pressure of the vapor at the same temperature
C. Heat added to or given up by a substance at constant temperature is called the sensible heat
D. The end points of a vapor-pressure vs. temperature curve are critical and triple points
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Claussius Clapeyron equation applies to the __________ process.
A. Sublimation
B. Melting
C. Vaporisation
D. All of the above
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With increase in the solute concentration, the specific heat of aqueous solutions
A. Increases
B. Decreases
C. Remains unchanged
D. Either A or B; depends on the type of solution
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For a reacation, X → Y, if the concentration of 'X' is tripled; the rate becomes nine times. The order of reaction is
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In a neutral solution
A. H+ ions are absent
B. OH- ions are absent
C. Both H+ and OH- ions are present in very small but equal concentration
D. None of these
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A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately
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In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest?
A. 30 c.c acid and 30 c.c base
B. 20 c.c acid and 25 c.c base
C. 15 c.c acid and 35 c.c base
D. 35 c.c acid and 15 c.c base
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In case of an unsaturated vapor-gas mixture, the humid volume increases with increase in the
A. Total pressure
B. Absolute humidity at a given temperature
C. Both A & B
D. Neither A nor B
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Which of the following is not a unit of pressure?
A. Parsec
B. Kilo-pascal
C. Bar
D. Newton/metre2
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NaOH contains __________ percent oxygen.
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Increasing the temperature of an aqueous solution will cause decrease in its
A. Molality
B. Mole fraction
C. Weight percent
D. Molarity
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The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is __________ kg mole.
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The value of gas constant 'R' is __________ kcal/kg.mole.°C.
A. 2.79
B. 1.987
C. 3.99
D. None of these
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Heat of __________ of a fuel is called its calorific value.
A. Formation
B. Combustion
C. Reaction
D. Vaporisation
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