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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The species among the following that does not exist is-

1. SnF62-

2. GeCl62-

3. CCl62-

4. SiF62-

Subtopic:  Carbon Family - Preparations, Properties & Uses |
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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 |
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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 |
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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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In which of the following silicates, only two corners per tetrahedron are shared?

(i) Pyro silicate                              (ii) Cyclic silicate 

(iii) Double chain silicate                (iv) Single chain silicate 

(v) 3D silicate                                (vi) Sheet silicate

Options are as follows :

(1) (i), (ii), and (v)                             

(2) (iv) and (vi) only

(3) (i) and (vi) only                             

(4) (ii) and (iv) only 

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
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The correct code for stability of oxidation states for given cations is :

(a) Pb2+>Pb4+, Bi3+>Bi5+                (b) Tl3+<In3+, Sn2+>Sn4+

(c) Sn2+<Pb2+, Sn4+>Pb4+               (d) Sn2+<Pb2+, Sn4+<Pb4+

(1) (a) and (b)                                     (2) (a), (b) and (c)

(3) (a) and (c)                                     (4) (b) and (d)

Subtopic:  Carbon 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 |
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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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