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:

1. H⁺ ion moving towards the cathode

2. H⁺ ion moving towards the anode

3. H₂ is liberated at anode

4. H₂ is liberated at cathode

Which statement is not correct for hydrogen peroxide ?

(1) Pure H₂O₂ is fairly stable

(2) It sometimes acts as a reducing agent

(3) It acts as an oxidising agent

(4) 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

10 volumes of H₂O₂ has a strength of approximately:

(1) 3%

(2) 30%

(3) 10%

(4) 5%

From the following statements regarding H₂O₂, choose the incorrect statement:

(1) It can act only as an oxidising agent

(2) It decomposes on exposure to light

(3) It has to be stored in plastic or wax lined glass bottles in dark

(4) It has to be kept away from dust