CBSE
Multiple Choice QuestionsA certain reaction is at equilibrium at 82°C and the enthalpy change for this reaction is 21.3 kJ. The value of S(JK-1mol-1) for the reaction is :
55.0
60.0
68.5
120.0
Heat of a reaction at constant pressure is equal to:
HP - HR
HP + HR
HP HR
In an isochoric process, the increase in internal energy is equal to:
the sum of heat absorbed and work done
the work done
heat absorbed
heat evolved
Assertion : Spontaneous process is an irreversible process and may be reversed by some external agency.
Reason : Decrease in enthalpy is a contributory factor for spontaneity.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false
If both assertion and reason are false.
10 moles of ideal gas expand isothermally and reversibly from a pressure of 10 atrn to 1 atm at 300K. What is the largest mass which can lifted through a height of 100 meter?
48.75 kg
58.55 kg
75.64 kg
64.13 kg
The temperature of the system decreases in an :
adiabatic compression
isothermal compression
isothermal expansion
adiabatic expansion
The cooling in refrigerator is due to :
the reaction of the refrigerator gas
the expansion of ice
the expansion of the gas in the refrigerator
the work of the compressor
The heat is liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25 °C and it increases the temperature of 18.94 kg of water by 0.632 °C. If the specific heat of water at 25 °C is 0.998 cal/g-deg, then value of the heat of combustion of benzoic acid is
881.1 kcal
981.1 kcal
771.1 kcal
871.2 kcal
The internal energy of a substance
decrease with increase in temperature
increase with increase in temperature
remains unaffected with change in temperature
calculated by E = mc2
In an isothermal process
