Which is an incorrect statement?

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(B) Statement $B$ is incorrect because $NaNO_3$ on heating decomposes to form sodium nitrite $(NaNO_2)$ and oxygen gas $(O_2)$,not sodium peroxide $(N

Vedclass · Accepted Answer

$NaNO_3$ forms $Na_2O_2$ on heating.

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(B) Statement $B$ is incorrect because $NaNO_3$ on heating decomposes to form sodium nitrite $(NaNO_2)$ and oxygen gas $(O_2)$,not sodium peroxide $(Na_2O_2)$.The reaction is: $2NaNO_3 \rightarrow 2NaNO_2 + O_2$.Statement $A$ is correct: Hydration energy is inversely proportional to ionic size $(HE \propto 1/r)$.Statement $C$ is correct: Alkaline earth metals ($IIA$ group) have smaller ionic radii and higher charge than alkali metals ($IA$ group),leading to higher hydration energy for $IIA$ ions.Statement $D$ is correct: The higher charge density of $IIA$ ions results in stronger electrostatic attraction with water molecules.

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