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.
The term ’auto-protolysis’ of water means :
1. | Physical reaction in which two water molecules react to produce a hydroxide ion (OH–) and a hydronium ion (). |
2. | Chemical reaction in which five water molecules react to produce a hydroxide ion (OH–) and a hydronium ion (). |
3. | Chemical reaction in which two water molecules react to produce a hydroxide ion (OH–) and a hydronium ion (). |
4. | Chemical reaction in which two water molecules react to produce three hydroxide ions (OH–) |
The correct statement about the reaction of water with fluorine is:
1. | O is reduced from 0 to -1 oxidation state, whereas F is oxidized from –2 to 0 |
2. | F is reduced from 0 to -1 oxidation state, whereas O is oxidized from –2 to 0 |
3. | F is reduced from 0 to –2 oxidation state, whereas O is oxidized from – 2 to -1 |
4. | O is reduced from 0 to –2 oxidation state, whereas F is oxidized from –3 to 0 |
The structure of the common form of ice is :
1. | Each hydrogen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 540 pm. |
2. | Each hydrogen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 276 pm. |
3. | Each oxygen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 276 pm. |
4. | Each oxygen atom is surrounded tetrahedrally by four other oxygen atoms at a distance of 540 pm. |