On this page you will get The p- Block Elements (Group- 13 and 14) JEE Main Previous year Questions with complete and detailed solution. These solutions are arranged in chronological order.
The p- Block Elements (Group- 13 and 14) JEE Main Previous year Questions with solution
2020
Q. The reaction of $\mathrm{H}_{3} \mathrm{~N}_{3} \mathrm{~B}_{3} \mathrm{Cl}_{3}(\mathrm{~A})$ with $\mathrm{LiBH}_{4}$ in tetrahydrofuran gives inorganic benzene $(B)$. Further, the reaction of $(\mathrm{A})$ with $(\mathrm{C})$ leads to $\mathrm{H}_{3} \mathrm{~N}_{3} \mathrm{~B}_{3}(\mathrm{Me})_{3}$. Compounds (B) and $(C)$ respectively, are:
(a) Borazine and MeBr
(b) Diborane and $\mathrm{MeMgBr}$
(c) Boron nitride and $\mathrm{MeBr}$
(d) Borazine and $\mathrm{MeMgBr}$
[Jan. 09, 2020 (II)]
Sol.
2019
Q. $\mathrm{C}_{60}$, an allotrope of carbon cantains:
(a) 12 hexagons and 20 pentagons.
(b) 18 hexagons and 14 pentagons.
(c) 16 hexagons and 16 pentagons.
(d) 20 hexagons and 12 pentagons.
[April 9, 2019 (I)]
Sol.
Q. The correct statements among I to III regarding group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.
(a) (I) and (II) only
(b) (I), (II) and (III)
(c) (I) and (III) only
(d) (II) and (III) only
[April 9, 2019 (II)]
Sol.
Q. Diborane $\left(\mathrm{B}_{2} \mathrm{H}_{6}\right)$ reacts independently with $\mathrm{O}_{2}$ and $\mathrm{H}_{2} \mathrm{O}$ to produce, respectively;
(a) $\mathrm{B}_{2} \mathrm{O}_{3}$ and $\mathrm{H}_{3} \mathrm{BO}_{3}$
(c) $\mathrm{H}_{3} \mathrm{BO}_{3}$ and $\mathrm{B}_{2} \mathrm{O}_{3}$
(b) $\mathrm{B}_{2} \mathrm{O}_{3}$ and $\left[\mathrm{BH}_{4}\right]^{-}$
(d) $\mathrm{HBO}_{2}$ and $\mathrm{H}_{3} \mathrm{BO}_{3}$
[April 8, 2019 (I)]
Sol.
Q. The hydride that is NOT electron deficient is:
(a) $\mathrm{SiH}_{4}$
(b) $\mathrm{B}_{2} \mathrm{H}_{6}$
(c) $\mathrm{GaH}_{3}$
(4) $\mathrm{AlH}_{3}$
[Jan. 11, 2019(II)]
Sol.
Q. The relative stability of $+1$ oxidation state of group 13 elements follows the order :
(a) $\mathrm{Al}<\mathrm{Ga}<\mathrm{Tl}<\mathrm{In}$
(b) $\mathrm{Tl}<\mathrm{In}<\mathrm{Ga}<\mathrm{Al}$
(c) $\mathrm{Ga}<\mathrm{Al}<\mathrm{In}<\mathrm{Tl}$
(d) $\mathrm{Al}<\mathrm{Ga}<\mathrm{In}<\mathrm{Tl}$
[Jan. 11, 2019 (II)]
Sol.
Q. The electronegativity of aluminium is similar to:
(a) Carbon
(b) Beryllium
(c) Boron
(d) Lithium
[Jan. 10, 2019 (I) ]
Sol.
Q. The number of 2-centre-2-electron and 3-centre-2-electron bonds in $\mathrm{B}_{2} \mathrm{H}_{6}$, respectively, are:
(a) 2 and 1
(b) 4 and 2
(c) 2 and 2
(d) 2 and 4
[Jan. 10, 2019 (II)]
Sol.
Q. Aluminium is usually found in $+3$ oxidation state. In contrast, thallium exists in $+1$ and $+3$ oxidation states. This is due to:
(a) inert pair effect
(b) diagonal relationship
(c) lattice effect
(d) lanthanoid contraction
[Jan. 9, 2019 (I)]
Sol.
Q. The basic structural unit of feldspar, zeolites, mica, and asbestos is:
(a) $\left(\mathrm{SiO}_{3}\right)^{2-}$
(b) $\mathrm{SiO}_{2}$
(c) $\left(\mathrm{SiO}_{4}\right)^{4}$
(d)
<smiles>[R]C(=C)O[SH]([R])([R])=O</smiles>
[April 12, $2019(\mathrm{I})$ ]
Sol.
Q. The correct statement among the following is :
(a) $\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N}$ is planar and less basic than $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$.
(b) $\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N}$ is pyramidal and more basic than $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$.
(c) $\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N}$ is pyramidal and less basic than $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$.
(d) $\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N}$ is planar and more basic than $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}$.
[April 12, $2019(\mathrm{I})]$
Sol.
Q. The $\mathrm{C}-\mathrm{C}$ bond length is maximum in :
(a) graphite
(b) $\mathrm{C}_{70}$
(c) $\mathrm{C}_{60}$
(d) diamond
[April 12, 2019 (II)]
Sol.
Q. The correct order of catenation is :
(a) $\mathrm{C}>\mathrm{Sn}>\mathrm{Si} \approx \mathrm{Ge}$
(b) $\mathrm{C}>\mathrm{Si}>\mathrm{Ge} \approx \mathrm{Sn}$
(c) $\mathrm{Si}>\mathrm{Sn}>\mathrm{C}>\mathrm{Ge}$
(d) $\mathrm{Ge}>\mathrm{Sn}>\mathrm{Si}>\mathrm{C}$
[April 10, $2019(\mathrm{I})]$
Sol.
Q. The amorphous form of silica is:
(a) Tridymite
(b) Kieselguhr
(c) Cristobalite
(d) Quartz
[April 9, 2019 (II)]
Sol.
Q. The element that does NOT show catenation is :
(a) Ge
(b) $\mathrm{Si}$
(c) $\mathrm{Sn}$
(d) $\mathrm{Pb}$
[Jan. 12, 2019 (II)]
Sol.
Q. The element that shows greater ability to form $p \pi-p \pi$ multiple bonds, is :
(a) $\mathrm{Sn}$
(b) $\mathrm{C}$
(c) Ge
(d) $\mathrm{Si}$
[Jan. 12, 2019 (II)]
Sol.
Q. The chloride that CANNOT get hydrolysed is :
(a) $\mathrm{PbCl}_{4}$
(b) $\mathrm{CCl}_{4}$
(c) $\mathrm{SnCl}_{4}$
(d) $\mathrm{SiCl}_{4}$
[Jan. 11, 2019 (I)]
Sol.
Q. Correct statements among ‘ $\mathrm{A}$ ‘ to ‘ $\mathrm{D}$ ‘ regarding silicones are:
(A) They are polymers with hydrophobic character.
(B) They are biocompatible.
(C) In general, they have high thermal stability and low dielectric strength.
(D) Usually, they are resistant to oxidation and used as greases.
(a) (A), (B), (C) and (D)
(b) (A), (B) and (C) only
(c) (A) and (B) only
(d) (A), (B) and (D) only
[Jan. 9, 2019 (I)]
Sol.
2018
Q. When metal ‘ $\mathrm{M}$ ‘ is treated with $\mathrm{NaOH}$, a white gelatinous precipitate ‘ $\mathrm{X}$ ‘ is obtained, which is soluble in excess of $\mathrm{NaOH}$. Compound ‘ $\mathrm{X}$ ‘ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘ $M$ ‘ is :
(a) $\mathrm{Zn}$
(b) Ca
(c) $\mathrm{Al}$
(d) $\mathrm{Fe}$
[2018]
Sol.
Q. A group 13 element ‘ $X$ ‘ reacts with chlorine gas to produce a compound $\mathrm{XCl}_{3} . \mathrm{XCl}_{3}$ is electron deficient and easily reacts with $\mathrm{NH}_{3}$ to form $\mathrm{Cl}_{3} \mathrm{X} \leftarrow \mathrm{NH}_{3}$ adduct, however, $\mathrm{XCl}_{3}$ does not dimerize. $\mathrm{X}$ is:
(a) B
(b) $\mathrm{Al}$
(c) In
(d) Ga
[Online April 16, 2018]
Sol.
Q. Which of the following are Lewis acids?
(a) $\mathrm{PH}_{3}$ and $\mathrm{BCl}_{3}$
(b) $\mathrm{AlCl}_{3}$ and $\mathrm{SiCl}_{4}$
(c) $\mathrm{PH}_{3}$ and $\mathrm{SiCl}_{4}$
(d) $\mathrm{BCl}_{3}$ and $\mathrm{AlCl}_{3}$
$[2018]$
Sol.
Q. In graphite and diamond, the percentage of $p$-characters of the hybrid orbitals in hybridisation are respectively:
(a) 33 and 25
(b) 67 and 75
(c) 50 and 75
(d) 33 and 75
[Online April 15, $2018(\mathrm{I})]$
Sol.
