The hydrides of carbon (C_nH_{2n + 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 ${\mathrm{NH}}_3$, H2O and HF, is 

1. HF > ${\mathrm{H}}_2\mathrm{O}$ > ${\mathrm{NH}}_3$

2. ${\mathrm{H}}_2\mathrm{O}$ > HF > ${\mathrm{NH}}_3$

3. HF > ${\mathrm{NH}}_3$ > ${\mathrm{H}}_2\mathrm{O}$

4. ${\mathrm{NH}}_3$ > HF > ${\mathrm{H}}_2\mathrm{O}$

CO2  is used as a fire extinguisher because -

1. ${\mathrm{CO}}_2$ has high lattice energy.

2. ${\mathrm{CO}}_2$ will be effective in isolating the burning surface from dihydrogen and dioxygen.

3. ${\mathrm{CO}}_2$ is lighter than dioxygen.

4. ${\mathrm{CO}}_2$ 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 (${\mathrm{H}}_3{\mathrm{O}}^{+}$).

2. Chemical reaction in which five water molecules react to produce a hydroxide ion (OH^–) and a hydronium ion (${\mathrm{H}}_3{\mathrm{O}}^{+}$).

3. Chemical reaction in which two water molecules react to produce a hydroxide ion (OH^–) and a hydronium ion (${\mathrm{H}}_3{\mathrm{O}}^{+}$).

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.

The softening of hard water by synthetic ion-exchange resins is based on -

1. Increasing the lattice energy.

2. Physical separation.

3. Lowering the activation energy.

4. Exchange of cations and anions.