The isotopes of hydrogen and their mass ratio are -

1. Protium, Deuterium, Tritium ; 3:2:3

2. Protium, Deuterium, Tritium ; 1:2:3

3. Protium, Deuterium, Tritium ; 2:2:3

4. Protium, Deuterium, Tritium ; 3:2:1

The colour of hydrogen is –

1. Blue                           

2. Yellow

3. Orange                       

4. No colour

The catalyst used to increase the production of H₂ , by ‘coal gasification' process is -

1. Copper 

2. FeCr₂O₄ (iron chromate) 

3. Pd/C 

4. None of the above.

The incorrect statement among the following regarding hydrogen is -

1. Hydrogen never acts as a cation in Ionic salts

2. Hydronium ion, H₃O⁺, exists freely in a solution

3. Dihydrogen does not act as a reducing agent

4. Hydrogen has three isotopes of which Protium is the most common