When a mixture of diborane and ammonia is heated, the final product is

1.  BH3

2.  NH4BH4

3.  NH2NH2

4.  B3N3H6

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 90%
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The bond energy of B-F bond in BF3 is 646 kJ mol-1, while that of N-F bond in NF3 is 280 kJ mol-1. This is because

1.  N is more electronegative than B

2.  The atomic mass of N is higher than that of B

3.  The B-F bond gets a partial double bond character due to p-p overlap

4.  N has a lone pair of electrons while B does not have

 

 

Subtopic:  Anomalous Behaviour of B & C | Compounds of Boron- Preparations, Properties & Uses |
 74%
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The Lewis acid strength of BBr3BCl3 and BF3 is the order 

1.  BBr3 < BCl3 < BF3

2.  BCl3 < BF3 < BBr3

3.  BF3 < BCl3 < BBr3

4.  BBr3 < BF3 < BCl3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 83%
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The element that combines with oxygen to give an amphoteric oxide is

1. N

2. P

3. Al

4. Na

Subtopic:  Boron Family- Preparations, Properties & Uses |
 95%
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Hydrolysis of BCl3 gives X which on treatment with sodium carbonate produces Y. X and Y, respectively, are 

1.  H3BO3 and NaBO2

2.  H3BO3 and Na2B4O7

3.  B2O3 and NaBO2

4.  B2O3 and Na2B4O7

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 78%
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In the structure of borax, the numbers of boron atoms and B-O-B units, respectively, are

1.  4 and 5

2.  4 and 3

3.  5 and 4

4.  5 and 3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 75%
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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 |
 79%
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Al2O3 reacts with 

1.  Only water

2.  Only acids

3.  Only alkalis

4.  Both acids and alkalis

Subtopic:  Boron Family- Preparations, Properties & Uses |
 93%
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The major products obtained in the reaction of oxalic acid with conc. H2SO4 upon heating are

1.  CO, CO2, H2O

2.  CO, SO2, H2O

3.  H2S, CO, H2O

4.  HCOOH, H2S, CO

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 64%
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Which element does not form alum?

1.  Fe

2.  Li

3.  K

4.  Al

Subtopic:  Boron Family- Preparations, Properties & Uses |
 66%
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