Explanation:
In transition metals, (n−1) d and ns electrons have nearly same energy level. Hence, most of these electrons take part in chemical bonding. Hence, transition metals show variable valency.
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On addition of small amount of $\ce{KMnO_4}$ to concentrated $\ce{H_2SO_4},$ a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.