Thermodynamics

Thermodynamics
Class:XI / Unit:6

1. Based on the first law of thermodynamics, which one of the following is correct?

For an isothermal process, q = +w
For an isochoric process, ΔU = -q
For a cyclic process, q = -w
For an adiabatic process, ΔU = -w

2. If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

ΔH > Δu
ΔH = Δu
ΔH < Δu
there is no relationship

3. Which of the following is an intensive property?

temperature
surface tension
viscosity
all of these

4. The temperature of the system decreases in an

isothermal compression
adiabatic expansion
adiabatic compression
isothermal expansion

5. Identify the correct statement from the following in a chemical reaction

The entropy always increases
Both the enthalpy and the entropy remain constant
The enthalpy always decreases
The change in entropy along with suitable change in enthalpy decides the fate of a reaction

6. One mole of which of the following has the highest entropy?

hydrogen gas
liquid nitrogen
diamond
mercury

7. Entropy of the universe is

zero
continuously increasing
continuously decreasing
constant

8. In which of the following process, a maximum increase in entropy is observed?

melting of ice
sublimation of naphthalene
dissolution of salt in water
condensation of water

9. For all the reactions what is the nature of the chemical dissociation?

exothermic
endothermic
reversible
Reversible and endothermic

10. What is a necessary condition for a reaction to be spontaneous at all temperatures?

ΔG and ΔH should be negative
ΔG and ΔH should be positive = 0
ΔH < ΔG
ΔH = ΔG = 0