The highest oxidation state exhibited by an element in its compounds is
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a
+7
b
+6
c
+8
d
+5
answer is C.
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Detailed Solution
In RuO4 , OsO4 and XeO4 , oxidation state of central atom is +8 (highest by any element in PT) ;Ru and Os belong to 8th group ;Xe belongs to 18th group ;