(a) and (c) only

(b) and (c) only

 (c) and (d) only

 (a), (c) and (c) only

 ${\mathrm{BF}}_6^{3-}$

 ${\mathrm{BH}}_4^{-}$

 $\mathrm{B}{\left(\mathrm{OH}\right)}_4^{-}$

 ${\mathrm{BO}}_2^{-}$

 ${\mathrm{O}}_2$

 ${\mathrm{SiH}}_4$

 ${\mathrm{H}}_2$

None of the above

 ${\left({\mathrm{SiO}}_4\right)}^{4-}$

 ${\left({\mathrm{SiO}}_3\right)}^{2-}$

 ${\left({\mathrm{SiO}}_4\right)}^{2-}$

 ${\left(\mathrm{SiO}\right)}^{-}$

heated cupric oxide

heated ferric oxide

heated stannic oxide

heated aluminium oxide

${\mathrm{H}}_{\mathrm{2, }}$and ${\mathrm{H}}_2$

${\mathrm{O}}_{\mathrm{2, }}$and ${\mathrm{O}}_2$

${\mathrm{O}}_{\mathrm{2, }}$and ${\mathrm{H}}_2$

${\mathrm{H}}_{\mathrm{2, }}$and ${\mathrm{O}}_2$

  $\mathrm{C}>\mathrm{Si}>\mathrm{Ge}>\mathrm{Sn}$

  $\mathrm{C}>>\mathrm{Si}>\mathrm{Ge}\approx \mathrm{Sn}$

  $\mathrm{Si}>\mathrm{C}>\mathrm{Sn}>\mathrm{Ge}$

  $\mathrm{Ge}>\mathrm{Sn}>\mathrm{Si}>\mathrm{C}$

SnO₂

(3) GeO₂

CO₂

NaHCO₃ on heating gives Na₂CO₃

They have open structure which enables them to take up small molecules.

Zeolites are aluminosilicates having three dimensional network.

Some of the ${\mathrm{SiO}}_4^{4-}$ units are replaced by ${\mathrm{AlO}}_4^{5-}\text{ and }{\mathrm{AlO}}_6^{9-}$ ions in zeolites.

They are used as cation exchangers.

Orthoborate

Metaborate

Double oxide

Tetraborate

 ${\mathrm{Pb}}^{+4}, {\mathrm{Sn}}^{+4}$

 ${\mathrm{Pb}}^{+4} , {\mathrm{Sn}}^{+2}$

 ${\mathrm{Pb}}^{+2} , {\mathrm{Sn}}^{+2}$

 ${\mathrm{Pb}}^{+2} , {\mathrm{Sn}}^{+4}$

The +2 oxidation state of Tl is more stable than the +2 oxidation state of B

The +2 oxidation state of B is more stable than the +2 oxidation state of Tl

4. The +3 oxidation state of Tl is more stable than the +3 oxidation state of B

Boron trifluoride is electron-rich.

Boron trifluoride is electron-deficient.

Boron trifluoride is highly stable.

None of these.

 ${\mathrm{BCI}}_3$ readily undergoes hydrolysis while ${\mathrm{CCI}}_4$ completely resists hydrolysis.

 ${\mathrm{CCI}}_4$  readily undergoes hydrolysis while ${\mathrm{BCI}}_3$ completely resists hydrolysis.

Both ${\mathrm{BCI}}_3$ and ${\mathrm{CCI}}_4$ readily undergo hydrolysis.

Neither ${\mathrm{BCI}}_3$ nor ${\mathrm{CCI}}_4$ undergo hydrolysis.

Protic acid.

Weak monobasic acid.

Lewis acid.

Both '2' and '3'

Orthoboric acid changes to metaboric acid

Metaboric acid changes to boric oxide

Both '1' and '2'

Neither '1' nor '2'

 ${\mathrm{BF}}_3$ - triangular geometry, ${\mathrm{sp}}^2$; $\mathrm{B}{{\mathrm{H}}_4}^{-}$- tetrahedral, ${\mathrm{sp}}^3$

 ${\mathrm{BF}}_3$ - tetrahedral, ${\mathrm{sp}}^2$; $\mathrm{B}{{\mathrm{H}}_4}^{-}$ - triangular geometry, ${\mathrm{sp}}^3$

  ${\mathrm{BF}}_3$ - tetrahedral, ${\mathrm{sp}}^3$ ; $\mathrm{B}{{\mathrm{H}}_4}^{-}$ - triangular geometry, $s{p}^3$

 ${\mathrm{BF}}_3$ - tetrahedral, ${\mathrm{sp}}^2$ ; $\mathrm{B}{{\mathrm{H}}_4}^{-}$ - triangular geometry, ${\mathrm{sp}}^2$

$1. 2\mathrm{Al}\left(\mathrm{s}\right) + 6\mathrm{HCl}\left(\mathrm{aq}\right) \to 2{\mathrm{Al}}^{+3}\left(\mathrm{aq}\right) + 6{\mathrm{Cl}}^{-}\left(\mathrm{aq}\right) + 3{\mathrm{H}}_2\left(\mathrm{g}\right)$​

$2. 2\mathrm{Al}\left(\mathrm{s}\right) + 2\mathrm{NaOH}\left(\mathrm{aq}\right) + 6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \to 2\mathrm{Na}\left[\mathrm{Al}{\left(\mathrm{OH}\right)}_4{]}^{-}\right(\mathrm{aq}) +3{\mathrm{H}}_2(\mathrm{g})$​

Both '1' and '2'

Neither '1' nor '2'

 ${\mathrm{SiCl}}_4$

 ${\mathrm{BCl}}_3$

 ${\mathrm{PCl}}_3$

 $\mathrm{ICl}$

 ${\mathrm{sp}}^2$, ${\mathrm{sp}}^3$, ${\mathrm{sp}}^2$

 ${\mathrm{sp}}^2$, ${\mathrm{sp}}^3$, $s{p}^3$

 ${\mathrm{sp}}^3$, ${\mathrm{sp}}^3$, ${\mathrm{sp}}^2$

 ${\mathrm{sp}}^3$, ${\mathrm{sp}}^2$, ${\mathrm{sp}}^3$

Presence of triple bond character in ${\mathrm{BF}}_3$

Resonance in $\mathrm{B}{{\mathrm{F}}_4}^{-}$

Presence of a double bond character in ${\mathrm{BF}}_3$

Presence of a double bond character in $\mathrm{B}{{\mathrm{F}}_4}^{-}$

The respective dipole-moments of the B–Cl bond add with each other

The respective dipole-moments of the B–Cl bond cancel each other

BCl₃ is tetrahedral in shape

  None of the above

It forms a complex with hemoglobin.

The CO–Hb complex is about 300 times more stable than the $O_2$–Hb complex.

It can kill a person through suffocation on not receiving oxygen.

All of the above

Higher the level of carbon dioxide, higher is the amount of heat trapped.

Higher the level of oxygen, higher is the amount of heat trapped.

Higher the level of carbon dioxide, lesser is the amount of heat trapped.

Higher the level of oxygen, lesser is the amount of heat trapped.

  Decrease in the charge of elements upon moving down the group.

  Decrease in the atomic sizes of elements upon moving down the group.

  Increase in the atomic sizes of elements upon moving down the group.

  Increase in the charge of elements upon moving down the group.

Poor shielding effect of the 2d-electrons

Poor shielding effect of the 3d-electrons

Poor shielding effect of the 3p-electrons

Poor shielding effect of the 2s-electrons

 ${\mathrm{Tl}}_2{\mathrm{O}}_3$, ${\mathrm{SiO}}_2$

 ${\mathrm{CO}}_2$, ${\mathrm{B}}_2{\mathrm{O}}_3$

 ${\mathrm{B}}_2{\mathrm{O}}_3$, ${\mathrm{SiO}}_2$

 ${\mathrm{AI}}_2{\mathrm{O}}_3$, ${\mathrm{PbO}}_2$

Aluminium, aluminium chloride, alumina

Aluminium, aluminium hydroxide, aluminium chloride

Aluminium hydroxide, aluminium chloride, aluminium

Aluminium hydroxide, aluminium chloride, sodium tetrahydroxoaluminate

Neutral

Amphoteric

Basic

Acidic