Which of the following statements are true?
(i) Mn has highest oxidation state in \( \text{Mn}_2\text{O}_7 \)
(ii) \( \text{MnO} \) is more ionic than \( \text{Mn}_2\text{O}_7 \)
(iii) \( \text{Mn}_2\text{O}_7 \) has one bridging O atom
(iv) Oxidation state of Mn is generally maximum in oxo compounds
Show Hint
In compounds, the oxidation state of Mn varies widely. The highest oxidation state of Mn is found in \( \text{Mn}_2\text{O}_7 \), and the ionic nature of the compound depends on the oxidation state of Mn.
In \( \mathrm{Mn_2O_7} \), let oxidation state of Mn = x.
\[
2x + 7(-2) = 0
\]
\[
2x - 14 = 0
\]
\[
x = +7
\]
+7 is the highest oxidation state of Mn.
Statement (i) is true.
Statement (ii):
\( \mathrm{MnO} \) contains Mn in +2 oxidation state and is largely ionic,
whereas \( \mathrm{Mn_2O_7} \) is covalent due to high oxidation state of Mn.
Statement (ii) is true.
Statement (iii):
The structure of \( \mathrm{Mn_2O_7} \) is
\[
\mathrm{O_3Mn{-}O{-}MnO_3}
\]
It contains one oxygen atom bridging two Mn atoms.
Statement (iii) is true.
Statement (iv):
Manganese generally attains its maximum oxidation state in oxo compounds
because oxygen stabilizes high oxidation states.
Statement (iv) is true.
Final Answer:
\[
\boxed{\text{All statements (i), (ii), (iii) and (iv) are true}}
\]
