The role of an electrolyte in the preparation of H2 by electrolytic method is:
1. | It lowers the availability of ions available in the process for the conduction of electricity. |
2. | It makes the ions available in the process for conduction of electricity. |
3. | It cools down the temperature. |
4. | None of the above |
The most abundant isotope of hydrogen is-
1. Tritium
2. Deuterium
3. Protium
4. Para-hydrogen
The products obtained on the completion of the following reactions (i) and (ii) respectively are :
i. | C3H8(g) + 3H2O(g) \(\xrightarrow[Catalyst]{\Delta}\) A |
ii. | \(\mathrm{Zn}_{(s)}+\mathrm{NaOH}_{(\mathrm{aq})} \xrightarrow[]{Heat}\)B |
1. A = CO, and H2 ; B = Na2ZnO2
2. A = CO2 ; B = Na4ZnO4
3. A = CH3CH2CH2OH ; B= ZnO
4. None of the above
The correct statement among the following regarding hydrogen is–
1. It can form a bond in +1 as well as –1 oxidation state
2. It is always collected at the cathode
3. It has a very low ionization potential
4. It has the same electronegativity as halogens
When substance A reacts with water, it produces a combustible gas B and a solution of substances 'C' in water. When another substance 'D' reacts with this solution of C, it produces the same gas 'B' on warming but 'D' can produce gas 'B' on reaction with dilute sulphuric acid at room temperature. 'A' imparts a deep golden yellow colour to a smokeless flame of a bunsen burner. A, B, C and D respectively are -
1.
2.
3.
4.
Ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because-
1. Ice has less density than water
2. Pressure generates heat
3. The chemical bonds break under pressure
4. Ice is not a true solid
The first ionization energy value for
is given below but not in a correct order
The ionization energy value of H would be -
1. 1681
2. 1312
3. 520
4. 485
Dihydrogen gas cannot be prepared with-
1. Cu + HCl (dil.)
2. Fe + H2SO4
3. Mg + steam
4. Na + alcohol
A compound among the following that has hydrogen in the atomic state is –
1. Metallic hydrides
2. Ionic hydrides
3. Molecular hydrides
4. Water
Hydrogen adsorbed on palladium is known as:
1. Atomic H
2. Nascent H
3. Occluded H
4. Heavy H