Chemistry · Redox Reactions
Valency is the combining capacity of an element, while oxidation number refers to the apparent charge on an atom in a compound. Metals with variable oxidation states are named using Stock notation (Roman numerals). For example, CuCl is called Copper(I) chloride, and in KMnO4, the oxidation state of Mn is +7. Which of the following statements are correct? (A) Cuprous chloride means copper is in +1 oxidation state. (B) Oxidation number and valency are always the same. (C) Manganese has oxidation number +7 in KMnO4. (D) Valency uses Roman numerals to represent oxidation state.
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- 1(A) and (C) only✓
- 2(A), (B), and (C)
- 3(B), (C), and (D)
- 4(A), (C), and (D)
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(A) and (C) only
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