$\mathrm{Ge}{\left(\mathrm{OH}\right)}_2$ is amphoteric

 ${\mathrm{GeCl}}_2$ is more stable than ${\mathrm{GeCl}}_4$

 ${\mathrm{GeO}}_2$ is weakly acidic

GeCl₄ + 2HCl ⇄ H₂[GeCl₆]

  Dehydrating agent

  Abrasive

  Solvent

  Catalyst

  Four $\mathrm{Al}—\mathrm{Cl}$ bonds are of same length and two of different length

  Six $\mathrm{Al}—\mathrm{Cl}$ bonds are of same length and two of different length

  The angle $\mathrm{Cl}—\mathrm{Al}—\mathrm{Cl}$ is $110°$ and $93°$

  The angle $\mathrm{Al}—\mathrm{Cl}—\mathrm{Al}$ is $87°$

  ${\mathrm{AlCl}}_3$

  ${\mathrm{Al}}_2{\mathrm{Cl}}_6$

  ${\mathrm{Al}}_2{\mathrm{O}}_3$

  $\mathrm{Al}\left(\mathrm{OH}\right){\mathrm{Cl}}_2$

  carbon dioxide is composed of discrete covalent ${\mathrm{CO}}_2$ molecules whereas silica has continuous

  ${\mathrm{CO}}_2$ molecules are lighter than ${\mathrm{SiO}}_2$ molecules

  ${\mathrm{CO}}_2$ is more acidic than ${\mathrm{SiO}}_2$

  melting point of silica is very high

  ${\mathrm{BH}}_3$

  ${\mathrm{NH}}_4{\mathrm{BH}}_4$

  ${\mathrm{NH}}_2{\mathrm{NH}}_2$

  ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

  coal gas

  producer gas

  water gas

  oil gas

  $\mathrm{Si}—\mathrm{C}—\mathrm{Si}—\mathrm{O}—\mathrm{Si}$

  $\mathrm{Si}—\mathrm{C}—\mathrm{Si}—\mathrm{C}—\mathrm{Si}$

  $—\stackrel{\mathbf{|}}{\mathrm{Si}}—\mathrm{O}—\stackrel{\mathbf{|}}{\mathrm{Si}}—\mathrm{O}—\stackrel{\mathbf{|}}{\mathrm{Si}}—$

  $\mathrm{Si}—\mathrm{Si}—\mathrm{Si}—\mathrm{Si}$

  potassium alumino silicate having sheet structure

  calcium alumino silicate having fibrous structure

  calcium magnesium silicate having three dimensional network

  hydrated sodium alumino silicate having three dimensional network

  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 2 : 1 \mathrm{ratio}$

  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 1 : 2 \mathrm{ratio}$

  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 1 : 4 \mathrm{ratio}$

  ${\mathrm{NH}}_3+{\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{in} 4 : 1 \mathrm{ratio}$

 As an antiseptic

 As a flux in soldering

 In making optical glasses

In making enamels and pottery glazes

Concentrated H₂SO₄

Solid NaOH

A saturated solution of CO₂

Anhydrous sodium carbonate

BF₃

BCl₃

BBr₃

BI₃

  Al

Sn

Pb

Thallium

Borax is white crystalline solid containing [B₄O₅(OH)₄]^2- units

Aqueous solution of borax is acidic in nature.

Cobalt gives green colour in borax bead test.

All are incorrect.

CO₂

CO

SnO₂

CaO

there is direct boron-boron bond

the structure is similar to that of C₂H₆

the boron atoms are linked through hydrogen bridges

all the atoms are in one plane

H₃BO₃

[BH₂(NH₃)₂]+ [BH₄]-

B₂(CH₃)₆

NaBH₄

BCl₃ > BBr₃ > BF₃ > BI₃

BF₃ < BBr₃ < BCl₃ < BI₃

BF₃ < BCl₃ < BBr₃ < BI₃

BF₃ >BCl₃ > BBr₃ > BI₃

Sn²⁺ is reducing while Pb⁴⁺ is oxidising agent

Sn²⁺ is oxidising while Pb⁴⁺ is reducing agent

Sn²⁺ and Pb²⁺ are both oxidising and reducing agent

Sn⁴⁺ is reducing while Pb⁴⁺ is oxidising agent

4

8

6

1

 ${\mathrm{BF}}_3$                               

 ${\mathrm{BCl}}_3$

 ${\mathrm{BBr}}_3$                             

 ${\mathrm{BI}}_3$

HCl, Mg                                 

 ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4{\left(\mathrm{OH}\right)}_2\right]}^{+}$       

 $\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_3{\left(\mathrm{OH}\right)}_3\right]$

 ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_2{\left(\mathrm{OH}\right)}_4\right]}^{-}$     

 $\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{\left(\mathrm{OH}\right)}_3\right]$

It is a useful primary standard for titrating against acids 

One molecule of borax contains 4 $\mathrm{B}—\mathrm{O}—\mathrm{B}$ bonds 

Aqueous solution of borax can be used as a buffer

It is made up of two triangular ${\mathrm{BO}}_3$ units and two tetrahedral ${\mathrm{BO}}_4$ units

() addition of cis1, 2 diol                   

() addition of trans1, 2 diol               

 ${\left(\mathrm{Sn}{F}_6\right)}^{2-}$

 ${\left({\mathrm{GeCl}}_6\right)}^{2-}$

 ${\left({\mathrm{CCl}}_6\right)}^{2-}$

 ${\left({\mathrm{SiF}}_6\right)}^{2-}$

Twelve electrons are involed in bonding 

Four, two centre-two electron bonds

Two, three centre-two electron bonds 

 X does not react with ${\mathrm{NH}}_3$