The number of carbon atoms per unit cell of diamond unit cell is:-

1. 4

2. 8

3. 6

4. 1

Subtopic:  Carbon Family - Preparations, Properties & Uses |  Structure & Properties of Allotropes of C |
From NCERT
NEET - 2013
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Name the type of the structure of silicate in which one oxygen atom of [SiO4]4- is

shared?

1. Sheet silicate

2. Pyrosilicate

3. three dimensional silicate

4. Linear chain silicate

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 57%
NEET - 2011
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Which one of the following anions is present in chain structure silicates?

(a) Si2O76-                 (b) (Si2O52-)n

(c) (Si2O64-)n               (d) SiO44-

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
From NCERT
NEET - 2007
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BX3+NH3R.T.BX3 .NH3+ Heat of adduct formation H

The numerical value of H is found to be maximum for :

(1) BF3                               

(2) BCl3

(3) BBr3                             

(4) BI3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Borax is converted into crystalline boron by the following steps:

          BoraxXH3BO3B2O3YB

X and Y are respectively :

1. HCl, Mg                                 
2. HCl, C
3. C, Al 
4. HCl, Al

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The dissolution of Al(OH)3 in a solution of NaOH results in the formation of -

1. AlH2O4OH2+       

2. AlH2O3OH3

3. AlH2O2OH4-     

4. AlH2O6OH3

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Choose the correct squence for the geometry of thr given molecules Borazone, Borazole, B3O63-, Fe2Cl6, trimer of FCN. ('P' stands for planar and 'NP' stdans for non-planar)

(1) NP, NP, NP, P, P                                 

(2) P, P, NP, NP, P

(3) NP, NP, NP, P, NP                                 

(4) NP, P, P, NP, P

Subtopic:  Boron Family- Preparations, Properties & Uses |
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It is because inability of ns2 electrons of the valence shell to participate in bonding that

1. Sn2+ is reducing while Pb4+ is oxidising agent

2. Sn2+ is oxidising while Pb4+ is reducing agent

3. Sn2+ and Pb2+ are both oxidising and reducing agent

4. Sn4+ is reducing while Pb4+ is oxidising agent

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 66%
NEET - 2017
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The incorrect statement among the following regarding borax is-

1. It is a useful primary standard for titrating against acids. 

2. One molecule of borax contains 4 \(B — O — B\) bonds.

3. Aqueous solution of borax can be used as a buffer.

4. It is made up of two triangular \(BO_{3}\) units and two tetrahedral \(BO_{4}\) units.

Subtopic:  Boron Family- Preparations, Properties & Uses |
 55%
From NCERT
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B(OH)3+NaOHNaBO2+NaBOH4+H2O

How can this reaction is made to proceed in forward direction?

(a) addition of cis1, 2 diol                   (b) addition of borax

(c) addition of trans1, 2 diol                (d) addition of Na2HPO4

 

Subtopic:  Boron Family- Preparations, Properties & Uses | Anomalous Behaviour of B & C |
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