W, X and Y are metals; one of them is copper and another is iron. • W forms a coloured oxide that can be reduced by carbon. • X forms a black oxide and is also found in nature as an uncombined pure metal. • Y forms an oxide that cannot be reduced by carbon. Which metal is the most reactive, and what could W be?
- Amost reactive: X; possible identity of W: Cu
- Bmost reactive: X; possible identity of W: Fe
- Cmost reactive: Y; possible identity of W: Cu
- Dmost reactive: Y; possible identity of W: Fe