Question

Identify the correct statements from the following:
I. For spontaneous reaction, ΔSₜₒₜₐₗ < 0 and ΔH > 0
II. Pressure is an intensive property
III. Bomb calorimeter works at constant volume

• A. I, II only
• B. I, III only
• C. II, III only
• D. I, II, III

Hint:

When considering properties related to thermodynamics and reaction conditions, remember that intensive properties are independent of the mass of the system, and spontaneous reactions often involve a net increase in entropy.

Answer 1

The Correct Option is C

Statement I: For a reaction to be spontaneous, \(\Delta S_{{total}}\) should be greater than zero (increased disorder), and typically \(\Delta H\) could be less than zero (exothermic), although endothermic reactions (\(\Delta H>0\)) can also be spontaneous if accompanied by a sufficient increase in entropy (\(\Delta S\)). Thus, statement I is incorrect.
Statement II: Pressure is indeed an intensive property as it does not depend on the amount of material present in the system. Therefore, statement II is correct.
Statement III: A bomb calorimeter operates at constant volume, which is true as the reaction occurs in a sealed container. Thus, statement III is correct.