The oxidation state of the underlined element in the given compound state is:
$U_{2} - - - {O_{7}}^{4 -}$

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none of these

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Solution

The correct option is A 5
$U_{2} o_{7}^{4} -$
Let oxidation state be $x$
$2 (x) + 7 (- 2) = - 4$
$2 x = 10$
$x = + 5$

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