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Which loses weight on exposure to the atmosphere ?
1. Concentrated H₂SO₄
2. Solid NaOH
3. A saturated solution of CO₂
4. Anhydrous sodium carbonate

The element among the following that does not show inert pair effect is-

An amphoteric  oxide among the following is-
1. CO₂
2. CO
3. SnO₂
4. CaO

In B₂H₆ 
(1) there is direct boron-boron bond
(2) the structure is similar to that of C₂H₆
(3) the boron atoms are linked through hydrogen bridges
(4) all the atoms are in one plane

From the B₂H₆ all the following can be prepared except:
(1) H₃BO₃
(2) [BH₂(NH₃)₂]+ [BH₄]-
(3) B₂(CH₃)₆
(4) NaBH₄

The correct order of ease of hydrolysis is :
1. CCl₄ < SiCl₄ < PCl₅ < AlCl₃
2. AlCl₃ < CCl₄ < PCl₅ < SiCl₄
3. CCl₄ < AlCl₃ < PCl₅ < SiCl₄
4. CCl₄ < AlCl₃ < SiCl₄ < PCl₅

The number of carbon atoms per unit cell of diamond unit cell is:-
1. 4
2. 8
3. 6
4. 1

${\mathrm{BX}}_3+{\mathrm{NH}}_3\stackrel{\mathrm{R}.\mathrm{T}.}{\to }{\mathrm{BX}}_3 .{\mathrm{NH}}_3+$ Heat of adduct formation $\left(∆\mathrm{H}\right)$
The numerical value of $∆\mathrm{H}$ is found to be maximum for :
(1) ${\mathrm{BF}}_3$                               
(2) ${\mathrm{BCl}}_3$
(3) ${\mathrm{BBr}}_3$                             
(4) ${\mathrm{BI}}_3$

Borax is converted into crystalline boron by the following steps:
          $\mathrm{Borax}\stackrel{\mathrm{X}}{\to }{\mathrm{H}}_3{\mathrm{BO}}_3\stackrel{∆}{\to }{\mathrm{B}}_2{\mathrm{O}}_3\underset{∆}{\overset{\mathrm{Y}}{\to }}\mathrm{B}$
X and Y are respectively :
1. HCl, Mg                                 
2. HCl, C
3. C, Al 
4. HCl, Al

The dissolution of $\mathrm{Al}(\mathrm{OH}{)}_3$ in a solution of $\mathrm{NaOH}$ results in the formation of -
1. ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4{\left(\mathrm{OH}\right)}_2\right]}^{+}$       
2. $\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_3{\left(\mathrm{OH}\right)}_3\right]$
3. ${\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_2{\left(\mathrm{OH}\right)}_4\right]}^{-}$     
4. $\left[\mathrm{Al}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6{\left(\mathrm{OH}\right)}_3\right]$

Which of the following cation can not give borax bead test?
(a) ${\mathrm{Cr}}^{3+}$                          (b) ${\mathrm{Co}}^{2+}$
(c) ${\mathrm{Ag}}^{+}$                           (d) ${\mathrm{Mn}}^{2+}$

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
 
 

The incorrect statement regarding above reactions is :
${\mathrm{BF}}_3+{\mathrm{LiAlH}}_4\stackrel{\mathrm{Ether}}{\to }\left(\mathrm{X}\right)+\mathrm{LiF}+{\mathrm{AlF}}_3$
(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 ${\mathrm{NH}}_3$

Lewis acid character of boron trihalides follows the order
1. $B{F}_3> BC{l}_3> BB{r}_3> B{I}_3$
2. $BC{l}_3 >B{F}_3 >BB{r}_3 >B{I}_3$
3. $B{I}_3> BB{r}_3 >BC{l}_3 >B{F}_3$
4. $B{I}_3 >BB{r}_3 >B{F}_3 >BC{l}_3$

Aluminium becomes passive in nitric acid because it-
1. Is a noble metal
2. Forms a thin film of oxide
3. Has a positive reduction potential
4.  None of the above

Hybridisation of boron in diborane is:
1.  $\mathrm{sp}$
2.  ${\mathrm{sp}}^2$
3.  ${\mathrm{sp}}^3$
4.  ${\mathrm{sp}}^3{\mathrm{d}}^2$

The blue coloured mineral 'Lapis Lazuli' used as semi precious stone is:
1.  sodium alumino silicate
2.  zinc cobaltate
3.  prussian blue
4.  basic copper carbonate

Red liquor is:
1.  ${\left({\mathrm{CH}}_3\mathrm{COO}\right)}_3 \mathrm{Al}$
2.  $\mathrm{Al}{\left(\mathrm{OH}\right)}_3$
3.  ${\mathrm{Al}}_2{\left({\mathrm{CO}}_3\right)}_3$
4.  ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$

${\mathrm{BCl}}_3$ does not exist as dimer but ${\mathrm{BH}}_3$ exist as dimer $\left({\mathrm{B}}_2{\mathrm{H}}_6\right)$ because:
1.chlorine is more electronegative than hydrogen
2.there is $\mathrm{p\pi }-\mathrm{p\pi }$ back bonding in ${\mathrm{BCl}}_3$ but ${\mathrm{BH}}_3$ does not contain such multiple bonding
3.large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted between boron atoms
4.none of the above

Which of the following imparts green colour to flame?
1.  $\mathrm{B}{\left(\mathrm{OMe}\right)}_3$
2.  $\mathrm{Na}\left(\mathrm{OMe}\right)$
3.  $\mathrm{Al}{\left({\mathrm{OBr}}_2\right)}_3$
4.  $\mathrm{Sn}{\left(\mathrm{OH}\right)}_2$

Borax bead test is responded by:
1.  Divalent metals
2.  Heavy metals
3.  Light metals
4.  Metal which forms coloured metaborates

Diborane does not undergo cleavage reaction with:
1.  trimethyl amine
2.  ammonia
3.  $\mathrm{CO}$
4.  ${\mathrm{CO}}_2$

Boric acid is not used:
1. As an antiseptic
2. As a flux in soldering
3. In making optical glasses
4. In making enamels and pottery glazes

Heating an aqueous solution of aluminium chloride to dryness will give:
1.  ${\mathrm{AlCl}}_3$
2.  ${\mathrm{Al}}_2{\mathrm{Cl}}_6$
3.  ${\mathrm{Al}}_2{\mathrm{O}}_3$
4.  $\mathrm{Al}\left(\mathrm{OH}\right){\mathrm{Cl}}_2$

Carbon dioxide is a gas but silica is a solid because:
1.  carbon dioxide is composed of discrete covalent ${\mathrm{CO}}_2$ molecules whereas silica has continuous
     tetrahedral structure
2.  ${\mathrm{CO}}_2$ molecules are lighter than ${\mathrm{SiO}}_2$ molecules
3.  ${\mathrm{CO}}_2$ is more acidic than ${\mathrm{SiO}}_2$
4.  melting point of silica is very high

The greatest percentage of $\mathrm{CO}$ is in:
1.  coal gas
2.  producer gas
3.  water gas
4.  oil gas

Which of the following shows bond in silicone?
1.  $\mathrm{Si}—\mathrm{C}—\mathrm{Si}—\mathrm{O}—\mathrm{Si}$
2.  $\mathrm{Si}—\mathrm{C}—\mathrm{Si}—\mathrm{C}—\mathrm{Si}$
3.  $—\stackrel{\mathbf{|}}{\mathrm{Si}}—\mathrm{O}—\stackrel{\mathbf{|}}{\mathrm{Si}}—\mathrm{O}—\stackrel{\mathbf{|}}{\mathrm{Si}}—$
4.  $\mathrm{Si}—\mathrm{Si}—\mathrm{Si}—\mathrm{Si}$

Mica is chemically:
1.  potassium alumino silicate having sheet structure
2.  calcium alumino silicate having fibrous structure
3.  calcium magnesium silicate having three dimensional network
4.  hydrated sodium alumino silicate having three dimensional network

Silicon carbide is used as:

$\mathrm{CO}$ reacts with chlorine in presence of sunlight to give:
1.  ${\mathrm{COCl}}_2$
2.  ${\mathrm{CO}}_2$
3.  ${\mathrm{CCl}}_4$
4.  ${\mathrm{CHCl}}_3$

Litharge is:
1. $\mathrm{PbO}$
2. ${\mathrm{PbO}}_2$
3. ${\mathrm{Pb}}_3{\mathrm{O}}_4$
4. $\mathrm{Pb}{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2$

Red lead is:
1.  $\mathrm{PbO}$
2.  ${{\mathrm{Pb}}_3\mathrm{O}}_4$
3.  ${\mathrm{PbO}}_2$
4.  $\mathrm{HgS}$

White lead or basic lead carbonate is:
1.  $\mathrm{Pb}{\left(\mathrm{OH}\right)}_2·2{\mathrm{PbCO}}_3$
2.  $\mathrm{Pb}{\left(\mathrm{OH}\right)}_2·\mathrm{Pb}{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2$
3.  ${\mathrm{PbCO}}_3$
4.  ${\mathrm{PbCO}}_3·\mathrm{Pb}{\left(\mathrm{OH}\right)}_2$

${\mathrm{R}}_3\mathrm{SiCl}$ on complete hydrolysis forms:
1.  ${\mathrm{R}}_3\mathrm{SiOH}$
2.  ${\mathrm{R}}_3\mathrm{Si}—\mathrm{O}—{\mathrm{SiR}}_3$
3.  ${\mathrm{R}}_3\mathrm{Si}=\mathrm{O}$
4.  None of the above.

Butter of tin is:
1.  ${\mathrm{SnCl}}_2·5{\mathrm{H}}_2\mathrm{O}$
2.  ${\mathrm{SnCl}}_4·5{\mathrm{H}}_2\mathrm{O}$
3.  ${\mathrm{SnBr}}_2·2{\mathrm{H}}_2\mathrm{O}$
4.  ${\mathrm{SnBr}}_4·5{\mathrm{H}}_2\mathrm{O}$

Pewter is an alloy of:
1.  Pb and Sn
2.  Pb, Sb and Sn
3.  Pb, Bi and Sn
4.  sb, Sn and Cu,Bi,Pb

Lead pipes can be used for:
1.  soft water
2.  hard water
3.  both hard and soft water
4.  none of the above

Ordinary glass is:
1.  sodium silicate
2.  copper silicate
3.  calcium silicate
4.  a mixture of calcium and sodium silicates with silica

Synthesis gas is a mixture of:
1.  steam and carbon monoxide
2.  carbon monoxide and nitrogen
3.  hydrogen and carbon monoxide
4.  hydrogen and methane

The substance used to impart green colour to glass is:
1.  ${\mathrm{Cu}}_2\mathrm{O}$
2.  $\mathrm{CdS}$
3.  ${\mathrm{MnO}}_2$
4.  ${\mathrm{Cr}}_2{\mathrm{O}}_3$

Tin cry refers to- 
1. Conversion of white to grey tin
2. Tin plating
3. Conversion of white tetrahedral tin to white rhombohedral tin
4. Emission of sound while bending a tin rod

Carbogen is:
1.  mixture of ${\mathrm{O}}_2+5-10\% {\mathrm{CO}}_2$
2.  used by pneumonia patients for respiration
3.  used by victims of $\mathrm{CO}$ for respiration
4.  all of the above

If a person is injured by the shot of a gun and all the pellets could not be removed, it may cause poisoning by:
1.  Hg
2.  Pb
3.  Fe
4.  As

Litharge is not commonly used in:
1.  manufacture of special glasses
2.  glazing pottery
3.  preparing paints
4.  lead storage battery

${\mathrm{PbO}}_2$ on reaction with ${\mathrm{HNO}}_3$ gives gas:
1. ${\mathrm{NO}}_2$
2. ${\mathrm{O}}_2$
3.  ${\mathrm{N}}_2$
4.  ${\mathrm{N}}_2\mathrm{O}$