NEET Chemistry Oxidation Number MCQ Question
Which of the following combinations regarding oxidation numbers is correct?
In a free state, elements have an oxidation number of zero; the sum of oxidation numbers in a compound must equal zero.
Nonmetals always have negative oxidation numbers; the oxidation number of transition metals is always positive.
In a polyatomic ion, the oxidation numbers must equal the sum of the oxidation states of the constituent atoms; elements in their free state can have positive oxidation numbers.
The oxidation number of an element in a compound can be negative; elements in their free state have varying oxidation numbers.
Correct Answer
Detailed Explanation
According to the NCERT context, elements in their free state indeed have an oxidation number of zero, and the sum of oxidation numbers in a compound must be zero. This aligns with the formulated rules for determining oxidation numbers.
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