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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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 BOB bonds.

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

4. It is made up of two triangular BO3 units and two tetrahedral BO4 units.

Subtopic:  Boron Family- Preparations, Properties & Uses |
 55%
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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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Which of the following cation can not give borax bead test?

(a) Cr3+                          (b) Co2+

(c) Ag+                           (d) Mn2+

Subtopic:  d-Block Elements- Properties & Uses |
 74%
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The species among the following that does not exist is-

1. SnF62-

2. GeCl62-

3. CCl62-

4. SiF62-

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 77%
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The incorrect statement regarding above reactions is :

(a) Al shows amphoteric character

(b) Gas 'P' and 'Q' are different

(d) Both X and Y are water soluble

(d) Gas Q is inflammable

 

 

Subtopic:  Boron Family- Preparations, Properties & Uses |
 58%
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The incorrect statement regarding above reactions is :

BF3+LiAlH4Ether(X)+LiF+AlF3

(1) Twelve electrons are involed in bonding 

(2) Four, two centre-two electron bonds

(3) Two, three centre-two electron bonds 

(4) X does not react with NH3

Subtopic:  Boron Family- Preparations, Properties & Uses |
 54%
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si2O5n2n- anion is obtained when :

(a) no oxygen of a SiO44- tetrahedron is shared with another SiO44- tetrahedron

(b) one oxygen of a SiO44- tetrahedron is shared with another SiO44- tetrahedron

(c) two oxygen of a SiO44- tetrahedron is shared with another SiO44- tetrahedron

(d) three oxygen of a SiO44- tetrahedron is shared with another SiO44- tetrahedron

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
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Amphibole silicate structure has 'x' number of corner shared per tetrahedon. The value of 'x' is :

(a) 2                            (b) 212

(c) 3                             (d) 4 

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
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