Q. A certain metal will liberate hydrogen from dilute acids. It will react with water to form hydrogen only when the metal is heated and water is in the form of steam. The metal is probably
A) Iron
B) Potassium
C) Copper
D) Mercury
Explanation
(a)
$Fe + H_{2}{SO}_{4}\ \longrightarrow {FeSO}_{4} + H_{2} \uparrow$
dil.
$3Fe + 4H_{2}O\ \longrightarrow 4H_{2} \uparrow + {Fe}_{3}O_{4}$
hot steam
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.