The reaction requires a large amount of heat to start.

A large amount of heat is absorbed during the reaction.

A large amount of heat is released during the reaction.

The reaction proceeds very slowly.

${{\rm{CO}}}$ and ${{\rm{H}}_2}$ are fractionally separated using differences in their densities

${{\rm{CO}}}$ is removed by absorption in aqueous ${\rm{C}}{{\rm{u}}_2}{\rm{C}}{{\rm{l}}_2}$ solution

${{\rm{H}}_2}$ is removed through occlusion with $pd$

${{\rm{CO}}}$ is oxidised to ${\rm{C}}{{\rm{O}}_2}\;$ with steam in the presence of a catalyst followed by absorption of ${\rm{C}}{{\rm{O}}_2}\;$ in alkali

Cu + HCl → CuCl₂ + H₂

Zn + 2HCl → ZnCl₂ + H₂

Ag + HCl → AgCl + H₂

Au + HCl → AuCl₃ + H₂

Lane’s process

Bosch process

From natural gas

All of these

a/2

a/√2

a/4

√3a/4

Reaction of metals with acids

Electrolysis of water

Reaction of non-metals with acids

Reaction of steam with hydrocarbons

It can catch fire

It is reduced by ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$

It is oxidized by ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$

It decomposes ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$

They have different numbers of neutrons.

They have the same number of protons.

They have different mass numbers.

They have identical physical properties.

Protium

Deuterium

Tritium

All isotopes of hydrogen contain neutrons

Heated cupric oxide

Heated ferric oxide

Heated stannic oxide

Heated aluminium oxide

Tritium

Deuterium

Protium

Hydrogen-4