Question:
In which of the following compounds, the size of manganese is maximum?
In which of the following compounds, the size of manganese is maximum?
Show Hint
For the same element,
\[
\boxed{\text{Higher oxidation state } \Rightarrow \text{smaller ionic size}.}
\]
Updated On: Jul 18, 2026
- \(\mathrm{KMnO_4}\)
- \(\mathrm{K_2MnO_4}\)
- \(\mathrm{Mn_2O_7}\)
- \(\mathrm{MnO_2}\)
Show Solution
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The Correct Option is D
Solution and Explanation
Step 1: Determine the oxidation state of Mn.& nbsp;
\[ \begin{aligned} \mathrm{KMnO_4} & amp;: +7,\\ \mathrm{K_2MnO_4} & amp;: +6,\\ \mathrm{Mn_2O_7} & amp;: +7,\\ \mathrm{MnO_2} & amp;: +4. \end{aligned} \]
Step 2: Compare ionic sizes.
The ionic size decreases with an increase in oxidation state due to greater effective nuclear attraction.
Among the given compounds,
\[ \mathrm{Mn^{4+}} \]
has the lowest oxidation state.
Therefore, it has the largest ionic size.
Step 3: Write the answer.
Hence,
\[ \boxed{\mathrm{MnO_2}}. \]
Thus, the correct option is
\[ \boxed{(D)}. \]
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