The total entropy change for a system and its surroundings increases, if the process is ____.
Reversible
Irreversible
Exothermic
Endothermic
When the value of entropy is greater, then the ability of work ____.
Is maximum
Is minimum
Is medium
None of the above
The entropy of a perfectly crystalline solid at absolute zero is ____.
Positive
Negative
Zero
Not definite
Which of the following endothermic processes are spontaneous?
Melting of iron
Evaporation of water
Heat of combustion
None of the above
Which law of thermodynamics helps in calculating entropy at different temperatures?
First law
Second law
Third law
Zeroth law
Which of the following statement is correct?
The heat of neutralization of strong acid and strong base is always the same
The enthalpy of fusion is negative
Heat of formation of is and is The enthalpy change for the reaction is ____.
196 kJ
– 196 kJ
984 kJ
– 984 kJ
When the aqueous solution of 0.5 mole is mixed with the 0.3 mole of solution, then what is the liberated heat (Enthalpy of neutralization is = 57.1 kJ) ____.
28.5 kJ
17.1 kJ
45.7 kJ
1.7 kJ
Heats of combustion for and are and respectively. The value of for the reaction,
is ____.
– 85 kcal
– 111 kcal
– 17 kcal
– 170 kcal
Point out the wrong statement in relation to enthalpy ____.
It is a state function
It is an intensive property
It is independent of the path followed for the change
Its value depends upon the amount of substance in the system
The process, in which no heat enters or leaves the system, is termed as ____.
Isochoric
Isobaric
Isothermal
Adiabatic
For the reaction
at and 1 atm. pressure, Then the change in internal energy is …. ____.
According to Hess’s law, the heat of reaction depends upon ____.
Initial condition of reactants
Initial and final conditions of reactants
Intermediate path of the reaction
End conditions of reactants
The work done by a system is 8 joule, when 40 joule heat is supplied to it. What is the increase in internal energy of system?
25 J
30 J
32 J
28 J
Which of the following statement is correct for this?
Heat of combustion of carbon is 110 kJ
Reaction is exothermic
Reaction needs no initiation
All of the above are correct