Oxidation states shown by a given 3d element

This type of question, asked 3 times: 2021 Paper 8, 4 Apr 2024, 5 Apr 2024. All 3 questions below, oldest first.

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Question 1
2021 Paper 8
39 $The common positive oxidation states for an element with atomic number 24, are:$
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Question 2
4 Apr 2024
45 $The element which shows only one oxidation state other than its elemental form is:$
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Question 3
5 Apr 2024
46 $The metal that shows highest and maximum number of oxidation state is:$
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