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

1. hydrogenation

2. reduction

3. dehydration

4. oxidation

The most abundant isotope of hydrogen is:

1. tritium

2. deuterium

3. protium

4. para-hydrogen

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

1. Fe

2. Mg or Mn

3. Cu

. 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

In solid hydrogen, the intermolecular bonding is:

1. ionic

2. van der Waals'

3. metallic

4. covalent

The lightest gas is :

1. nitrogen

2. helium

3. oxygen

4. hydrogen

Benzene is oxidized by H₂O₂ in presence of FeSO₄ to:

1. phenol

2. cyclohexane

3. benzaldehyde

4. benzoic acid

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

1. bonded differently

2. bonded similarly

3. bonded covalently

4. bonded by hydrogen bonds

10 volumes of H₂O₂ has a strength of approximately:

1. 3%

2. 30%

3. 10%

4. 5%

H₂O₂ turns an acidified solution of ........ to orange red.

1. BaO₂

2. PbO₂

3. Na₂O₂

4. TiO₂