What is the oxidation state of Mn in Manganese (VII) oxide?

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Solution

The correct option is A 7
Albert stock proposed a new system known as Stock system. In this system, the oxidation states are indicated by Roman numeral written in parentheses immediately after the name of the element. For example,
$\begin{matrix} C u_{2} O & C o p p e r (I) o x i d e & S n O & T i n (I I) o x i d e F e C l_{2} & I r o n (I I) c h l o r i d e & M n_{2} O_{7} & M a n g a n e s e (V I I) o x i d e K_{2} C r_{2} O_{7} & P o t a s s i u m d i c h r o m a t e (V I) & N a_{2} C r O_{4} & S o d i u m c h r o m a t e (V I) V_{2} O_{3} & V a n a d i u m (V) o x i d e & C u O & C o p p e r (I I) S n O_{2} & T i n (I V) o x i d e & F e C l_{3} & I r o n (I I I) c h l o r i d e \end{matrix}$
So, for Mn in $M n_{2} O_{7}$ it is +7.

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What is the oxidation state of Manganese in Manganese (VII) oxide?

K_{2} M n O_{4}

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