From the following, the compund(s) that react(s) with ${\mathrm{BF}}_3$ is/are -

1.  Ethers

2.  ${\mathrm{H}}_2\mathrm{O}$

3.  ${\mathrm{NH}}_3$

4.  All of the above

The products formed by the oxidation of ${\mathrm{NaBH}}_4 \mathrm{and} {\mathrm{l}}_2$ are:

1.  ${\mathrm{B}}_2{\mathrm{H}}_6 \mathrm{and} \mathrm{Nal} \mathrm{only}$

2.  ${\mathrm{B}}_2{\mathrm{H}}_6, {\mathrm{H}}_2 \mathrm{and} \mathrm{Nal}$

3.  ${\mathrm{Bl}}_3 \mathrm{and} \mathrm{NaH}$

4.  ${\mathrm{NaBl}}_4 \mathrm{and} \mathrm{Hl}$

Ionization enthalpy (${∆}_{\mathrm{i}}{\mathrm{H}}_1\mathrm{kJ} {\mathrm{mol}}^{-1}$) for the elements of Group 13 follows the order.

1.  B > Al > Ga > In > Tl

2.  B < Al < Ga < In < Tl

3.  B < Al > Ga < In > Tl

4.  B > Al < Ga > In < Tl

A compound X, of boron, reacts with ${\mathrm{NH}}_3$ on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating ${\mathrm{BF}}_3$ with Lithium aluminium hydride. The compounds X and Y are represented by the formulas -

1.  ${\mathrm{B}}_2{\mathrm{H}}_6, {\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

2.  ${\mathrm{B}}_2{\mathrm{O}}_3, {\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

3.  ${\mathrm{BF}}_3, {\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6$

4.  ${\mathrm{B}}_3{\mathrm{N}}_3{\mathrm{H}}_6, {\mathrm{B}}_2{\mathrm{H}}_6$

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 a 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. The melting point of silica is very high.

Carbogen is:

1.  A mixture of ${\mathrm{O}}_2+5-10\% of {\mathrm{CO}}_2$.

2.  Used by pneumonia patients for respiration.

3.  Used by victims of $\mathrm{CO}$ for respiration.

4.  All of the above.

Death due to gunshot is caused by poisoning of:

1.  Hg

2.  Pb

3.  Fe

4.  As

Consider the following reaction

${\mathrm{BF}}_3 \stackrel{{\mathrm{Al}}_2{\mathrm{Cl}}_4}{\to } \left(\mathrm{A}\right) \underset{\mathrm{discharged}}{\overset{{\mathrm{H}}_2 - \mathrm{gas}}{\to }} \left(\mathrm{B}\right) \stackrel{{\mathrm{H}}_2\mathrm{O}}{\to } \left(\mathrm{C}\right)$

The correct statement among the following is -

1. (A) is ${\mathrm{BCl}}_3$

2. (C) is ${\mathrm{B}}_2{\mathrm{H}}_6$

3. (C) is ${\left[{\mathrm{B}}_2{\left(\mathrm{OH}\right)}_4\right]}^{-}$

4. (B) is ${\mathrm{B}}_2{\mathrm{Cl}}_4$

A strong oxidizing agent among the following is -

1.  ${\mathrm{Tl}}^{3+}$

2.  ${\mathrm{Ga}}^{3+}$

3.  ${\ln }^{3+}$

4.  ${\mathrm{Al}}^{3+}$

A species among the following that decomposes easily is -

1.  ${\mathrm{Pbl}}_2$

2.  ${\mathrm{Pbl}}_4$

3.  $\mathrm{Pb}{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_4$

4.  ${\mathrm{PbCl}}_2$