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 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 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 correct statement about electron-deficient hydride is that it:
1. | Does not have sufficient electrons to form a regular bond. |
2. | Cannot be represented by conventional Lewis structures. |
3. | Accept electrons. |
4. | All of the above. |
The hydrides of carbon (CnH2n + 2) can act as -
1. Lewis acid.
2. Lewis base.
3. Both 1 and 2
4. None of the above
“Non-stoichiometric hydrides” are :
1. | Hydrogen-deficient compounds formed by the reaction of a hydrogen atom with d-block and f-block elements. |
2. | Hydrogen-deficient compounds formed by the reaction of dihydrogen with d-block and f-block elements. |
3. | Electron-deficient compounds formed by the reaction of dihydrogen with d-block and f-block elements. |
4. | Hydrogen-deficient compounds formed by the reaction of dihydrogen with s-block and p-block elements. |
Metallic hydrides are useful for hydrogen storage because :
1. Metallic hydrides are oxygen-rich.
2. Metallic hydrides are oxygen-deficient.
3. Metallic hydrides are hydrogen-rich.
4. Metallic hydrides are hydrogen-deficient.
Atomic hydrogen or oxy-hydrogen torch is used for cutting and welding purposes because:
1. | Atomic hydrogen converts into molecular hydrogen and generates a large amount of energy. |
2. | Atomic hydrogen converts into molecular hydrogen and generates a low amount of energy. |
3. | Molecular hydrogen converts into atomic hydrogen and generates a large amount of energy. |
4. | Molecular hydrogen converts into atomic hydrogen and generates a low amount of energy. |
The correct order of hydrogen bonding among , H2O and HF, is
1. HF > >
2. > HF >
3. HF > >
4. > HF >
CO2 is used as a fire extinguisher because -
1. has high lattice energy.
2. will be effective in isolating the burning surface from dihydrogen and dioxygen.
3. is lighter than dioxygen.
4. is lighter than dihydrogen.