Question

Assertion: The solubility product of hydroxide of $F{e}^{2+}$ is higher than that of $F{e}^{3+}$.

Reason: The lattice energy of $Fe(OH{)}_2$ is lower than that of $Fe(OH{)}_3$.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  
• B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
• C. Assertion is true but Reason is false
• D. Assertion is false but Reason is true
  
• E. Both Assertion and Reason are false

Answer 1

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion

The solubility product $\left(K_{SP}\right)$ of $Fe(OH{)}_2$ is $7.9\times {10}^{-15}$.
The solubility product $\left(K_{SP}\right)$ of $Fe(OH{)}_3$ is $6.3\times {10}^{-38}$.
Hence, the solubility product of hydroxide of $F{e}^{2+}$ is higher than that of $F{e}^{3+}$. In other words, $Fe(OH{)}_2$ is more soluble than $Fe(OH{)}_3$. This is due to lower lattice energy of $Fe(OH{)}_2$ than that of $Fe(OH{)}_3$