Correct Answer: Option B

Explanation

Potassium dichromate, K\(_2\)Cr\(_2\)O\(_7\) 

→ [1 * 2] + [Cr * 2] + [-2 * 7] = 0

→ 2 + 2Cr - 14 = 0

→ 2Cr = 12

→Cr = \(\frac{12}{2}\) → 6

There is an explanation video available below.

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