Question

2. When solid potassium chloride is added to water, the temperature of the mixture decreases. What conclusion can be made from this observation? (a) The process is exothermic. (b) The process is endothermic. (c) All solids dissolve wi
th a fall in temperature. (d) None of these​

Answer 1

Answer:

Potassium chloride absorbs heat from its surroundings when it dissolves in water. Therefore, dissolution of potassium chloride is an endothermic process. The dissolution of calcium chloride is an exothermic process. ... If the water were to evaporate, the salt would remain.

Answer 2

(b) The process is endothermic is the conclusion.

1. When reactions take place, heat can either be evolved or absorbed.
2. The ones giving out heat are called exothermic reaction and the reactions absorbing or requiring heat are called endothermic reaction.
3. Practically exothermic reactions become warm or hot and endothermic reactions, as they absorb heat, become cool.
4. Hence, given reaction is endothermic.