The products formed by the oxidation of NaBH4 and l2 are:

1.  B2H6 and Nal only

2.  B2H6, H2 and Nal 

3.  Bl3 and NaH

4.  NaBl4 and Hl 

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Ionization enthalpy (iH1kJ mol-1) for the elements of Group 13 follows the order.

1.  B > Al > Ga > In > Tl

2.  B < Al < Ga < In < Tl

3.  B < Al > Ga < In > Tl

4.  B > Al < Ga > In < Tl

Subtopic:  Boron Family- Preparations, Properties & Uses |
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A compound X, of boron, reacts with NH3 on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating BF3 with Lithium aluminium hydride. The compounds X and Y are represented by the formulas -

1.  B2H6, B3N3H6

2.  B2O3, B3N3H6

3.  BF3, B3N3H6

4.  B3N3H6, B2H6

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Carbon dioxide is a gas but silica is a solid because:

1. Carbon dioxide is composed of discrete covalent CO2 molecules whereas silica has a continuous tetrahedral structure.

2. CO2 molecules are lighter than SiO2 molecules.

3. CO2 is more acidic than SiO2.

4. The melting point of silica is very high.

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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Carbogen is:

1.  A mixture of O2+5-10% of CO2.

2.  Used by pneumonia patients for respiration.

3.  Used by victims of CO for respiration.

4.  All of the above.

Subtopic:  Carbon Family - Preparations, Properties & Uses |
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Death due to gunshot is caused by poisoning of:

1.  Hg

2.  Pb

3.  Fe

4.  As

Subtopic:  Properties of Glass, Pb & Sn compounds |
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Consider the following reaction

BF3 Al2Cl4 A dischargedH2 - gas B H2O C

The correct statement among the following is -

1. (A) is BCl3

2. (C) is B2H6

3. (C) is B2OH4-

4. (B) is B2Cl4

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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From the following, the compund(s) that react(s) with BF3 is/are -

1.  Ethers

2.  H2O

3.  NH3

4.  All of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
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A strong oxidizing agent among the following is -

1.  Tl3+

2.  Ga3+

3.  ln3+

4.  Al3+

Subtopic:  Boron Family- Preparations, Properties & Uses |
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A species among the following that decomposes easily is -

1.  Pbl2

2.  Pbl4

3.  PbCH3COO4

4.  PbCl2

Subtopic:  Properties of Glass, Pb & Sn compounds |
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