1
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
Answer & Solution
Answer: Option
C
2
'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
Answer & Solution
Answer: Option
A
3
pH value of a solution containing 1 gm of hydrogen ion per litre will be
A)
0
B)
1
C)
7
D)
10
Answer & Solution
Answer: Option
A
4
Weight of 56 litres of ammonia at N.T.P. is __________ gm.
A)
2.5
B)
42.5
C)
56
D)
2800
Answer & Solution
Answer: Option
B
5
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
Answer & Solution
Answer: Option
B
6
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
Answer & Solution
Answer: Option
B
7
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
Answer & Solution
Answer: Option
D
8
Claussius Clapeyron equation applies to the __________ process.
A)
Sublimation
B)
Melting
C)
Vaporisation
D)
All of the above
Answer & Solution
Answer: Option
D
9
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
Answer & Solution
Answer: Option
B
10
For a reacation, X → Y, if the concentration of 'X' is tripled; the rate becomes nine times. The order of reaction is
A)
0
B)
1
C)
2
D)
3
Answer & Solution
Answer: Option
C
