In the preparation of hydrogenated oil the chemical reaction involving hydrogen is called:

(a) hydrogenation

(b) reduction

(c) dehydration

(d) oxidation

The most abundant isotope of hydrogen is:

(a) tritium

(b) deuterium

(c) protium

(d) para-hydrogen

Hydrogen is evolved by the action of cold dilute HNO₃ on:

(a) Fe

(b) Mg or Mn

(c) Cu

(d) Al

A molten ionic hydride on electrolysis gives:

(a) H⁺ ion moving towards the cathode

(b) H⁺ ion moving towards the anode

(c) H₂ is liberated at anode

(d) H₂ is liberated at cathode

Which statement is not correct for hydrogen peroxide ?

(a) Pure H₂O₂ is fairly stable

(b) It sometimes acts as a reducing agent

(c) It acts as an oxidising agent

(d) Aqueous solution of H₂O₂ is weakly basic

In solid hydrogen, the intermolecular bonding is:

(a) ionic

(b) van der Waals'

(c) metallic

(d) covalent

The lightest gas is :

(a) nitrogen

(b) helium

(c) oxygen

(d) hydrogen

The critical temperature of water is higher than that of O₂ because H₂O molecule has:

(a) fewer electrons than oxygen

(b) two covalent bonds

(c) V-shape

(d) dipole moment

Benzene is oxidized by H₂O₂ in presence of FeSO₄ to:

(a) phenol

(b) cyclohexane

(c) benzaldehyde

(d) benzoic acid

The oxidizing property of H₂O₂ is best explained by assuming that two oxygen atoms in its molecule are:

(a) bonded differently

(b) bonded similarly

(c) bonded covalently

(d) bonded by hydrogen bonds