Borazine is called inorganic benzene. It has a ring structure with alternate BH and NH groups. Which of the following statements is not correct about borazine?

1.  Each B and N atom is sp2 hybridized

2.  Borazine satisfies the (4n + 2)π electrons Huckel's rule

3.  Like organic benzene, borazine does not give addition product with HCI

4.  Borazine contains dative pπ - pπ bond

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 63%
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The incorrect statement for orthoboric acid is

1.  It can not be titrated satisfactorily with NaOH, as a sharp endpoint is not obtain

2.  The acidity of its aqueous solution increases upon addition of ethylene glycol

3.  It is a weak electrolyte in water

4.  It has a three-dimensional structure due to hydrogen bonding

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The coordination number of Al in aluminates, is-

1. 3 2. 6
3. 1 4. 4
Subtopic:  Boron Family- Preparations, Properties & Uses |
 66%
From NCERT
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A mixed oxide compound among the following is -

1.  PbO2

2.  SnO2

3.  Pb2O3

4.  Pb3O4

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 59%
From NCERT
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Select the correct statement(s) regarding the following reaction sequence:

 
   

1.  The compound (A) is CH32SiCl2

2.  The compound D is SiC

3.  The compound (B) is CH32SiOH2

4.  All of the above

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 88%
From NCERT
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The number of double bonds at alternate position in C60 molecule are

1.  20

2.  25

3.  30

4.  36

Subtopic:   Structure & Properties of Allotropes of C |
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Incorrect statement among the following is

1.  BnHn+6 are known as arachnoboranes

2.  Indium hydride is a polymeric solid

3.  AlH3 is a monomeric planar molecule

4.  Nido-boranes have the general formula BnHn+6

Subtopic:  Anomalous Behaviour of B & C |
 52%
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A species among the following that decomposes easily is: -

1. \(\mathrm{Pbl}_2 \) 2. \(\mathrm{Pbl}_4 \)
3. \(\mathrm{PbCH}_3 \mathrm{COO}_4 \) 4. \(\mathrm{PbCl}_2\)
Subtopic:  Properties of Glass, Pb & Sn compounds |
 71%
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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 |
 76%
From NCERT
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From the following, the compound(s) that react(s) with \(\mathrm{BF}_3\) is/are -

1. Ethers 2. \( \mathrm{H}_2 \mathrm{O} \)
3. \(\mathrm{NH}_3 \) 4. All of the above
Subtopic:  Boron Family- Preparations, Properties & Uses |
 79%
From NCERT
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