Three metals, X, Y and Z, were each brought into contact with water. Their oxides, made from the same three metals, were then heated strongly with carbon. The observations are shown below. Metal X: reacted vigorously with cold water; metal oxide with carbon: no reaction. Metal Y: did not react with water; metal oxide with carbon: metal and carbon dioxide produced. Metal Z: no reaction seen with cold water but reaction seen with steam; metal oxide with carbon: no reaction. What conclusion about X, Y and Z is correct?
- AX is sodium and Y is magnesium.
- BX is the least reactive and Y is the most reactive.
- CZ is less reactive than Y.
- DZ is magnesium and Y is copper.