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

Subtopic:  Type of Hydride |
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“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.

Subtopic:  Type of Hydride |
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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.

Subtopic:  Type of Hydride |
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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

Subtopic:  Type of Hydride |
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 The correct order of hydrogen bonding among NH3, H2O and HF, is 

1. HF > H2O > NH3

2. H2O > HF > NH3

3. HF > NH3 > H2O

4. NH3 > HF > H2O

Subtopic:  Type of Hydride | Water |
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CO is used as a fire extinguisher because -

1. CO2 has high lattice energy.

2. CO2 will be effective in isolating the burning surface from dihydrogen and dioxygen.

3. CO2 is lighter than dioxygen.

4. CO2 is lighter than dihydrogen.

Subtopic:  Type of Hydride |
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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 (H3O+).

2. Chemical reaction in which five water molecules react to produce a hydroxide ion (OH) and a hydronium ion (H3O+).

3. Chemical reaction in which two water molecules react to produce a hydroxide ion (OH) and a hydronium ion (H3O+).

4. Chemical reaction in which two water molecules react to produce three hydroxide ions (OH)

Subtopic:  Water |
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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

Subtopic:  Water |
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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.

Subtopic:  Water |
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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.

Subtopic:  Hard & Soft Water |
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