Question

Select the odd one out and justify your answer​
Fe, Zn, Cu and Mg​

Answer 1

Odd one out amongst the given option is- Copper (Cu)​ ​

Since copper is placed below hydrogen in the reactivity series, it cannot displace hydrogen from dilute acids.​ ​

While iron, zinc, magnesium are placed above hydrogen in the reactivity series. So, they react with dilute acids to liberate hydrogen gas.​