Question

A 4
DJ IU
0
70. Which of the following statement is incorrect
1) Reactivity order of metal – Hg < Na < Cu<K
2) Roasting - Heating of ore – in Absence of air
3) Thermite reaction - Al2O3 + Fe >Fe2O3 + 2Al : Heat
4) Calcination - Heating of ore - in presence of air​

Answer 1

Answer:

First one

Explanation:

cause reactivity seris start as K<Na<Ca<Mg<Al<Zn<Fe and so on

But it doesn't start with Hg