Question

Which of the following statements are correct?
I. The (-ve) value of $△H$ for the dissolution of ionic compound is enough to predict the compound solubility in water at any temperature.
II. For the alkali metals carbonate, solubility order decreases down the group.
III. For the alkali metals ozonide, the thermal stability order increases down the group.
IV. For the alkaline earth metals nitride, the thermal stability order increases down the group

• A. $T$, $T$, $F$, $F$
• B. $T$, $F$, $F$, $T$
• C. $T$, $F$, $T$, $F$
• D. $F$, $T$, $T$, $F$

Answer 1

The correct option is A $T$, $T$, $F$, $F$

The compound will be soluble in water if hydration energy is higher than the lattice enthalpy of the compound. So (-ve) value of $△H$ for the dissolution of the ionic compound is enough to predict the compound is soluble in water at any temperature.

For the alkali metals carbonate, solubility order decreases down the group.

For the alkali metals ozonide, the thermal stability order decreases down the group.

For the alkaline earth metals nitride, the thermal stability order decreases down the group.