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
Hydrogen exists in diatomic form rather than monoatomic form under normal conditions -
1. Due to high ionization enthalpy
2. Due to low ionization enthalpy
3. Due to high electron gain enthalpy
4. Due to low electron gain enthalpy
The consequences of high enthalpy of H–H bond in dihydrogen is /are :
1. | Hydrogen has a low tendency to form ions. |
2. | It forms diatomic molecules (), and a large number of covalent hydrides. |
3. | Hydrogen does not possess metallic characteristics. |
4. | All of the above. |
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.
Hydrogen is placed separately in the periodic table because :
1. It resembles alkali metals.
2. It shows the same reactions as halogens.
3. Both (1) and (2)
4. None of the above.