Al and Ga have the same covalent radii because of:

1. Greater shielding power of s-electrons of Ga atoms

2. Poor shielding power of s-electrons of Ga atoms

3. Poor shielding power of d-electrons of Ga atoms

4. Greater shielding power of d-electrons of Ga atoms

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Which is used as mordant?

1.  AlCl3

2.  Al2SO43

3.  Alum

4.  Al2O3

Subtopic:  Boron Family- Preparations, Properties & Uses |
 56%
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Hybridisation of boron in diborane is:

1.  sp

2.  sp2

3.  sp3

4.  sp3d2

Subtopic:  Boron Family- Preparations, Properties & Uses |
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The blue coloured mineral 'Lapis Lazuli' used as semi precious stone is:

1.  sodium alumino silicate

2.  zinc cobaltate

3.  prussian blue

4.  basic copper carbonate

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Red liquor is:

1.  CH3COO3 Al

2.  AlOH3

3.  Al2CO33

4.  Al2SO43

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Boron carbide, B4C is widely used for:

1.  making acetylene

2.  making plaster of Paris

3.  as a hardest substance after diamond

4.  making boric acid

Subtopic:  Boron Family- Preparations, Properties & Uses |
 59%
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Which one is explosive?

1.  PCl5

2.  PbNO32

3.  NH4NO3 + Al powder

4.  C6H5NO2

Subtopic:  Boron Family- Preparations, Properties & Uses |
 72%
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BCl3 does not exist as dimer but BH3 exist as dimer B2H6 because:

1.chlorine is more electronegative than hydrogen

2.there is - back bonding in BCl3 but BH3 does not contain such multiple bonding

3.large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted between boron atoms

4.none of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Which of the following imparts green colour to flame?

1.  BOMe3

2.  NaOMe

3.  AlOBr23

4.  SnOH2

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Borax bead test is responded by:

1.  Divalent metals

2.  Heavy metals

3.  Light metals

4.  Metal which forms coloured metaborates

Subtopic:  Boron Family- Preparations, Properties & Uses |
 85%
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