Which of the following is true?....

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Which of the following is true?
(1) \( \mathrm{MnF}_{7} \) exists.
\( \mathrm{P} \)
(2) The higher oxidation state of a transition metal is satisfied by the fluorides.
(3) The higher oxidation state of a transition metal is satisfied favourably by the oxides as it can form multiple bonds.
(4) \( \mathrm{Mn}_{2} \mathrm{O}_{7} \) is a basic oxide.


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