State reason for the following:(a) Non-metals cannot displace hydrogen from the acids.(b) Hydrogen is not a metal, yet it is placed in the activity series of metals.(c) Aluminium is more reactive than iron, yet its corrosion is less than that of iron.
Answers
Reasons
Explanation:
(a) Non-metals cannot displace hydrogen from the acids.
Non-metals have the tendency to accept electrons. They do not provide free electrons in an acidic medium to release hydrogen. So they do not displace hydrogen from the acids.
(b) Hydrogen is not a metal, yet it is placed in the activity series of metals.
Hydrogen is a non-metal but it is still included in the reactivity series because it behaves like a metal in many chemical reactions. Hydrogen ion has a positive charge similar to metals. Hydrogen readily loses its electron in order to form a positive ion (H+). So Hydrogen is placed in the activity series of metals.
(c) Aluminium is more reactive than iron, yet its corrosion is less than that of iron.
Aluminum is more reactive than iron but it doesn't corrode because of the outer layer of aluminium oxide. The outer surface of the metal gets oxidized when it comes in contact with air and forms aluminium oxide. This aluminium oxide remains attached to the metal and it is resistive in nature.
Explanation:
(i) Non-metals are electron acceptors, they
cannot supply electrons so as to convert H+
ion to H2(g).
(ii) Like metals, hydrogen can lose an electron to
form positive H+ ion.
(iii) Aluminium is covered with a strong protective
layer of oxide which protects the metal from
further corrosion.