Question

Which of the following statements most accurately characterizes the compound(s) that exhibit reduced solubility as temperature rises?
A. NH3 and Ce2(SO4)3 only
B. NaCI and Ce2 (SO4)3 only
C. NH3 only
D. NH3 and NaCI only

Answer 1

The question asks which compounds exhibit reduced solubility as temperature rises. Generally, most solid salts become more soluble in water as the temperature increases. However, some exceptions exist.

1. **Ammonia (NH3)**: As a gas dissolved in water, ammonia's solubility actually decreases with an increase in temperature; thus, it has reduced solubility at higher temperatures.
2. **Sodium chloride (NaCl)**: NaCl typically increases in solubility with rising temperatures, meaning it does not exhibit reduced solubility as temperature rises.
3. **Cerium(III) sulfate (Ce2(SO4)3)**: This compound also tends to increase in solubility with temperature, not decrease.

Based on this information, the only compound that exhibits reduced solubility as temperature rises is **NH3**.

Thus, the answer is **C. NH3 only**.