Mixing of non-reacting gases is generally accompanied by ____.
Decrease in entropy
Increase in entropy
Change in enthalpy
Change in free energy
Which of the following is the least random state of water?
Ice
Liquid water
Steam
All present same random state
The entropy of crystalline substances at absolute zero going by the third law of thermodynamics should be taken as ____.
100
50
Zero
Different for different substances
The for the vaporization of 1 mol of water is 88.3 J/mole K. The value of for the condensation of 1 mol of vapour is ____.
88.3 J/mol K
– 88.3 J/mol K
The positive value of indicates that ____.
The system becomes less disordered
The system becomes more disordered
The system is in equilibrium position
The system tends to reach at equilibrium position
One mole of an ideal gas at is expanded isothermally from an initial volume of 1 litre to 10 liters. The change in energy for this process is ____.
163.7 cal
850.2 cal
1381.1 cal
Zero
If 0.75 mole of an ideal gas expands isothermally at from 15 liters to 25 liters, the maximum work obtained is ____.
8.40 J
9.34 J
10.86 J
10.43 J
An engine operating between and takes 500 J heat from a higher temperature reservoir if there are no frictional losses, and then work done by engine is ____.
147.7 J
157.75 J
165.85 J
169.95 J
2.1 g of Fe combines with S evolving 3.77 kJ. The heat of formation of FeS in kJ/mol is ____.
– 1.79
– 100.5
– 3.77
None of the above
For exothermic reaction, the equilibrium constant ____.
Increases with increase of P
Decreases with increase of P
Increases with increase of temperature
Decreases with increase of temperature
Compounds with high heat of formation are less stable because ____.
High temperature is required to synthesise them
Molecules of such compounds are distorted
It is difficult to synthesis them
Energy rich state leads to instability