Thermodynamics - Second law

Entropy increases from solid, liquid to gas. Why?

• Molecular disorder increases
• Molecular randomness decreases
• Molecules are more energetic
• Molecules are more reactive

Which of the following statement is incorrect?

• (a) Heat (q) has randomising influence on the system.

• (b) Entropy change varies directly with temperature.

• (c) Entropy change is a state function.

• (d) Temperature is the measure of average chaotic motion of the particle in the system.

Which of the following statement is correct?

• (a) In case of chemical reactions, entropy change shows the rearrangement of atoms or ions from one pattern in the reactants to another

• (b) The greater the degree of randomness, higher is the entropy

• (c) The crystalline solid state is most ordered, while gaseous state is most disordered

• (d) All of the above

Which of the following pair(s) of conditions certain to result in a spontaneous reaction?

• (a) Endothermic and decreasing order

• (b) Exothermic and increasing disorder

• (c) Endothermic and increasing disorder

• (d) Exothermic and decreasing disorder

Which of the following statement is incorrect regarding spontaneity of a reaction?

• (a) The flow of heat is unidirectional from higher temperature to lower temperature

• (b) All naturally occurring processes tend to proceed spontaneously in any direction

• (c) The gas in a container will not spontaneously contract into one corner

• (d) Spontaneous reactions occurs immediately when contact is made between the reactants