Question

Consider the following three processes: (1) Melting of ice at room temperature (2) Boiling of water at 101°C (3) Dissolving of NH4NO3 with water in an instant cold pack? Which statement(s) that are true about ALL three of the given processes? (Choose one or more)(A) Endothermic(B) Exothermic(C) Nonspontaneous(D) Spontaneous(E) none of these statements can be used to describe all three processes

Answer 1

Answer: Option (A) is the correct answer.

Step-by-step explanation:

Exothermic reaction is defined as the reaction in which release of heat takes place. Whereas endothermic reaction is defined as the reaction in which heat is absorbed by the reactant molecules.

• When ice melts at room temperature it is an endothermic reaction as it occurs due to absorption of heat.

• Boiling of water at
  `101^(o)C` is also an endothermic process. This is because heat is absorbed by water molecules due to which their state changes from liquid to vapor form.

• When
  `NH_(4)NO_(3)` is dissolved in water then heat is absorbed as there occurs a decrease in temperature of water. Hence, it is also an endothermic reaction.

Thus, we can conclude that for the given statements its is true that ALL three of the given processes are endothermic.