Question

Why MgO will form after Mg reacting with CuO? (mcq)

Mg forms positive ions and O forms negative ions
Mg is more reactive than Cu
CuO have loose bonding

Answer 1

Mg is more reactive than Cu

Step-by-step explanation:

In the reaction between Mg and CuO to form MgO, MgO will form because Mg is more reactive than Cu.

This kind of reaction is called a single replacement or single displacement reaction.

• The replacement of a metallic ion in solution by a metal atom higher in the activity series than the metal in solution falls into this category of reactions.
• The element Mg is higher than Cu in the activity series.
• The higher an element is in the activity series, the more reactive they are.
• Since Mg is more reactive, it will displace the Cu from CuO.