Atomic hydrogen is produced when H₂ molecules at a high temperature are irradiated with UV radiation.

At around 2000 K, the dissociation of dihydrogen into its atoms is nearly 8.1%

Bond dissociation enthalpy of H₂ is highest among diatomic gaseous molecules which contain a single bond.

Dihydrogen is produced on reacting zinc with HCl as well as NaOH_(aq).

Novolac

PHBV

Dacron

Glyptal

Br > Cl > I

Br > I > Cl

Cl > I > Br

I > Cl > Br

(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)

(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)

(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)