Question

sodium reacts violently with cold water whereas iron reacts only with steam at high temperature. Give reason

Answer 1

because sodium is a more reactivi metal than iron and this fact os proved in the metal reactivity series in which hydrogen is the only non metal.....

K
Na (sodium)
Ca
Mg
Al
Zn
Fe (iron)
Sn
Pb
H
Cu
Ag
Au
Pt.

Answer 2

the reactivity of the element sodium is more than the reactivity of element iron is the sodium reacts violently with cold water where as iron reacts only with steam at high temperature