Which of the following statements is false ?
- $\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ is less soluble than $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$.
- $\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{4}$ is a secondary standard solution in volumetry.
- $\mathrm{CrO}_{4}^{2-}$ is tetrahedral in shape.
- $\mathrm{Cr}_{2} \mathrm{O}_{7}{ }^{2-}$ has a $\mathrm{Cr}-\mathrm{O}-\mathrm{Cr}$ bond.
Solution
$\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{4}$ is a secondary standard solution in volumetry as it is hygroscopic in nature.
Hydration energy of $\mathrm{Na}^{+}$ is greater than $\mathrm{K}^{+}$ because of smaller size of $\mathrm{Na}^{+}$. So, $\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ is more soluble than $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ *
Asked in: JEE-TOPICTESTS-CHEMISTRY
Practice more THE D AND F BLOCK ELEMENTS questions on Aicharya