Incorrect statement about \( \mathrm{Mn}_{2} \mathrm{O}_{7} \) is : (a) it is a covalent oxide (...

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Incorrect statement about \( \mathrm{Mn}_{2} \mathrm{O}_{7} \) is :
(a) it is a covalent oxide
(b) Mn-O-Mn linkage is present
(c) it is purple in colour
(d) Mn is tetrahedrally surrounded by \( \mathrm{O} \) atoms
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