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 |
 58%
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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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Reactivity of borazole is greater than that of benzene because:

1.  borazole is non-polar compound

2.  borazole is polar compound

3.  borazole is electron deficient compound

4.  of localized electron in it

Subtopic:  Boron Family- Preparations, Properties & Uses |
 51%
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Inorganic benzene is:

1. BN

2. BF4

3. B2H6

4. B3N3H6

Subtopic:  Boron Family- Preparations, Properties & Uses |
 86%
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Diborane does not undergo cleavage reaction with:

1.  trimethyl amine

2.  ammonia

3.  CO

4.  CO2

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Fluorine is more electronegative than either boron or phosphorus. What conclusion can be drawn from the fact that BF3 has no dipole moment but PF3 has?

1.  BF3 is spherically symmetrical, PF3 is not

2.  BF3 molecule must be linear

3.  The atomic radius of P is larger than the atomic radius of B

4.  The BF3 molecule must be planar triangular

Subtopic:  Boron Family- Preparations, Properties & Uses |
 67%
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Borazine is obtained by reaction of:

1.  NH3+B2H6 in 2 : 1 ratio

2.  NH3+B2H6 in 1 : 2 ratio

3.  NH3+B2H6 in 1 : 4 ratio

4.  NH3+B2H6 in 4 : 1 ratio

Subtopic:  Boron Family- Preparations, Properties & Uses |
 64%
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Boric acid is not used:

1. As an antiseptic

2. As a flux in soldering

3. In making optical glasses

4. In making enamels and pottery glazes

Subtopic:  Boron Family- Preparations, Properties & Uses |
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