The effect of heating Boric acid at 370 K or above is -

1. Orthoboric acid changes to metaboric acid

2. Metaboric acid changes to boric oxide

3. Both '1' and '2'

4. Neither '1' nor '2'

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The electron-deficient compound among the following is -

1. SiCl4

2. BCl3

3. PCl3

4. ICl

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The hybridization of carbon in (a) CO32- (b) diamond (c) graphite is respectively-

1. sp2sp3sp2

2. sp2sp3sp3

3. sp3sp3sp2

4. sp3sp2sp3

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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The B–F bond lengths in BF3 (130 pm) and BF4-(143 pm) differ because of-

1. Presence of triple bond character in BF3

2. Resonance in BF4-

3. Presence of a double bond character in BF3

4. Presence of a double bond character in BF4-

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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B–Cl bond has a dipole moment. Still, the BCl3 molecule has zero dipole moment because-

1. The respective dipole-moments of the B–Cl bond add with each other

2. The respective dipole-moments of the B–Cl bond cancel each other

3. BCl3 is tetrahedral in shape

4.  None of the above

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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CO is a poisonous gas because -

1. It forms a complex with hemoglobin.

2. The CO–Hb complex is about 300 times more stable than the O2–Hb complex.

3. It can kill a person through suffocation on not receiving oxygen.

4. All of the above

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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An excessive content of CO2 is responsible for global warming as-

1. Higher the level of carbon dioxide, higher is the amount of heat trapped.

2. Higher the level of oxygen, higher is the amount of heat trapped.

3. Higher the level of carbon dioxide, lesser is the amount of heat trapped.

4. Higher the level of oxygen, lesser is the amount of heat trapped.

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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The sharp decrease in ionization enthalpy from carbon to silicon happens because of-

1.  Decrease in the charge of elements upon moving down the group.

2.  Decrease in the atomic sizes of elements upon moving down the group.

3.  Increase in the atomic sizes of elements upon moving down the group.

4.  Increase in the charge of elements upon moving down the group.

Subtopic:  Carbon Family - Preparations, Properties & Uses |
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The correct explanation for the lower atomic radius of Ga as compared to Al is -

1. Poor shielding effect of the 2d-electrons

2. Poor shielding effect of the 3d-electrons

3. Poor shielding effect of the 3p-electrons

4. Poor shielding effect of the 2s-electrons

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Amphoteric oxides are:

1. Tl2O3SiO2

2. CO2B2O3

3. B2O3SiO2

4. AI2O3PbO2

Subtopic:  Compounds of Boron- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
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