Question

Identify species having metal atom in \(+6\) oxidation state from following

• A. \(\text{MnO}_4^-\)
• B. \([\text{Cr}(\text{CN})_6]^{3-}\)
• C. \(\text{Cr}_2\text{O}_3\)
• D. \(\text{CrO}_2\text{Cl}_2\)

Hint:

Assign oxidation states using charge balance on each species.

Answer 1

The Correct Option is D

Step 1: Equation for each
(A) $x - 8 = -1$, (B) $x - 6 = -3$, (C) $2x - 6 = 0$, (D) $x - 4 - 2 = 0$.

Step 2: Solve
(A) $x = +7$, (B) $x = +3$, (C) $x = +3$, (D) $x = +6$.

Step 3: Note
Cl is $-1$ and O is $-2$ in chromyl chloride, and the compound is neutral, so chromium must supply $+6$.

Step 4: Answer
Option (D).

Final Answer:
Only chromyl chloride has the metal at +6. This is option (D). \[ \boxed{\text{(D) }\text{CrO}_2\text{Cl}_2} \]