During winters, moisture condenses in the form of dew and can be seen on plant leaves and grass. The entropy of the system in such cases decreases as liquids possess lesser disorder as compared to gases. With reference to the second law, which statement is correct, for the above process ?

(1) The randomness of the universe decreases

(2) The randomness of the surroundings decreases

(3) Increase is randomness of surroundings equals the decrease in randomness of system

(4) The increase in randomness of the surroundings is greater as compared to the decrease in randomnessof the system.

For which process will $∆$H° and $∆$G° be expected to be most similar.

(1) 2Al(s) + Al₂O₃(s) → 2Fe(s) + A_l2O₃(s)

(2) 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

(3) 2NO₂(g) → N₂O₄(g)

(4) 2H₂(g) + O₂(g) → 2H₂O(g)

A copper block of mass `m' at temperature 'T<sub>1</sub>' is kept in the open atmosphere at temperature `T₂' where T₂ > T₁ . The variation of entropy of the copperblock with time is best illustrated by
 

1.		2.
3.		4.

1. 

2. 

3. 

4. 

The heat produced in calories by the combustion of one gram of carbon is called

1. Heat of combustion of carbon

2. Heat of formation of carbon

3. Calorific value of carbon

4. Heat of production of carbon

Which of the following best describes the behavior of an ideal gas during isothermal expansion?
(ΔE & ΔH represent the change in internal energy and enthalpy respectively)

1. ΔE and ΔH increases

2. ΔE increases but ΔH decreases

3. ΔE decreases but ΔH increases

4. ΔE = 0 and ΔH = 0

If a refrigerator's door is opened, then we get

(1) Room heated

(2) Room cooled

(3) More amount of heat is passed out

(4) No effect on room

Point out the wrong statement in relation to enthalpy

1. It is a state function

2. It is an intensive property

3. It is independent of the path followed for the change

4. Its value depends upon the amount of substance in the system

Which of the following is zero for an isochoric process

1. dP

2. dV

3. dT

4. dE

Mark the correct statement 

1. For a chemical reaction to be feasible, ΔG should be zero

2. Entropy is a measure of order in a system

3. For a chemical reaction to be feasible, ΔG should be positive

4. The total energy of an isolated system is constant

Internal energy is an example of [Pb. PMT 2000]

(1) Path function

(2) State function

(3) Both (1) and (2)

(4) None of these