**JEE Main Previous Year Papers Questions of Chemistry with Solutions are available at eSaral. Practicing JEE Main chapter wise questions of Chemistry will help the JEE aspirants in realizing the question pattern as well as help in analyzing weak & strong areas.**

**Simulator**

**Previous Years AIEEE/JEE Mains Questions**

Q. The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is :-
(1) 144 pm (2) 288 pm (3) 398 pm (4) 618 pm

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**Sol.**(1) radius of cation = 110 pm if cation present 2n OV $a=2\left(r_{+}+r_{-}\right)$ 508 = 2[110 + x] x = 144 pm

Q. Percentages of free space in cubic close packed structure and in body centered packed structure are respectively :-
(1) 48% and 26% (2) 30% and 26% (3) 26% and 32% (4) 32% and 48%

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**Sol.**(3) Theory Based

Q. Copper crystallises in fcc lattice with a unit cell edge of 361 pm. The radius of copper atom is:-
(1) 181 pm (2) 108 pm (3) 128 pm (4) 157 pm

**Aieee-11 / JEE-Main-ONLINE 2013**
Q. In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is :-
(1) $\mathrm{A}_{2} \mathrm{B}_{3}$
( 2) $\mathrm{A}_{2} \mathrm{B}_{5}$
(3) $\mathrm{A}_{2} \mathrm{B}$
(4) $\mathrm{AB}_{2}$

**Aieee-11 / JEE-Main-ONLINE 2014**
Q. Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be :-
(1) 152 pm (2) 75 pm (3) 300 pm (4) 240 pm

**Aieee-12**
Q. The radius of a calcium ion is 94 pm and of the oxide ion is 146 pm. The possible crystal structure of calcium oxide will be :-
(1) OctahedralΒ Β Β Β (2) TetrahedralΒ Β Β Β Β (3) PyramidalΒ Β Β Β Β Β (4) Trigonal

**Jee-Main (online)-12**
Q. Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of 390 pm. If the size of chloride ion is180 pm, the size of ammonium ion would be:
(1) 158 pm (2) 174 pm (3) 142 pm (4) 126 pm

**Jee-Main (online)-12**
Q. A solid has ‘bcc’ structure. If the distance of nearest approach between two atoms is 1.73 Γ
, the edge length of the cell is :-
(1) 314.20 pm (2) 216 pm (3) 200 pm (4) 1.41 pm

**Jee-Main (online)-12**
Q. Among the following the incorrect statement is :-
(1) Density of crystals remains unaffecfted due to Frenkel defect
(2) In BCC unit cell the void space is 32%
(3) Electrical conductivity of semiconductors and metals increases with increase in temperature
(4) Density of crystals decreases due to Schottky defect

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**Sol.**(3) Theory Based

Q. In a face centred cubic lattice, atoms of A form the corner points and atoms of B form the face centred points. If two atoms of A are missing from the corner points, the formula of the ionic compound is
(1) $\mathrm{AB}_{2}$
( 2) $\mathrm{AB}_{3}$
(3) $\mathrm{AB}_{4}$
(4) $\mathrm{A}_{2} \mathrm{B}_{5}$

**Jee-Main (online)-13**
Q. Which one of the following statements about packing in solids is

**incorrect**? (1) Void space in ccp mode of packing is 26% (2) Coordination number in hcp mode of packing is 12 (3) Void space in hcp mode of packing is 32% (4) Coordination number in bcc mode of packing is 8**Jee-Main (online)-13****Download eSaral App for Video Lectures, Complete Revision, Study Material and much more...**

**Sol.**(3) Theory based

Q. An element having an atomic radius of 0.14 nm crystallizes in an fcc unit cell. What is the length of a side of the cell ?
(1) 0.96 nm (2) 0.4 nm (3) 0.24 nm (4) 0.56 nm

**Jee-Main (online)-13**
Q. Expermentally it was found that a metal oxide has formula $\mathrm{M}_{0.98} \mathrm{O}$. Metal M, is present as $\mathrm{M}^{2+}$ and $\mathbf{M}^{3+}$ in its oxide. Fraction of the metal which exists as $\mathrm{M}^{3+}$ would be :-
(1) 7.01%Β Β Β Β Β (2) 4.08%Β Β Β Β Β Β (3) 6.05%Β Β Β Β Β Β (4) 5.08

**Jee-Main (offline)-13**
Q. The total number of octahedral void(s) per atom present in a cubic close packed structure is :-
(1) 1Β Β Β Β Β (2) 2Β Β Β Β Β Β Β (3) 3Β Β Β Β Β Β Β (4) 4

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**Sol.**(1) Theory based

Q. In a monoclinic unit cell, the relation of sides and angles are respectively
(1) $\mathrm{a} \neq \mathrm{b} \neq \mathrm{c}$ and $\alpha \neq \beta \neq \gamma \neq 90^{\circ}$
(2) $a \neq b \neq c$ and $\beta=\gamma=90^{\circ} \neq \alpha$
(3) $a=b \neq c$ and $\alpha=\beta=\gamma=90^{\circ}$
(4) $a \neq b \neq c$ and $\alpha=\beta=\gamma=90^{\circ}$

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**Sol.**(2) Theory based

Q. The appearance of colour in solid alkali metal halides is generally due to :
(1) Frenkel defect (2) F-centres (3) Schottky defect (4) Interstitial position

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**Sol.**(2) Theory based

Q. CsCl crystallises in body centred cubic lattice. if ‘a’ is its edge length then which of the following expression is correct :
(1) $\mathrm{r}_{\mathrm{Cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=\frac{\sqrt{3}}{2} \mathrm{a}$
(2) $\mathrm{r}_{\mathrm{Cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=\sqrt{3} \mathrm{a}$
(3) $\quad \mathrm{r}_{\mathrm{Cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=3 \mathrm{a}$
(4) $\mathrm{r}_{\mathrm{Cs}^{+}}+\mathrm{r}_{\mathrm{Cl}^{-}}=\frac{3 \mathrm{a}}{2}$

**Jee-Main (offline)-14**
Q. A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be :-
(1) 2a
(2) $2 \sqrt{2} \mathrm{a}$
(3) $\sqrt{2} \mathrm{a}$
(4) $\frac{\mathrm{a}}{\sqrt{2}}$

**JEE – Main 2017**
Q. Which type of ‘defect’ has the presence of cations in the interstitial sites ?
(1) Vacancy defect
(2) Frenkel defect
(3) Metal deficiency defect
(4) Schottky defect

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**Sol.**(2) In Frenkel defect, some of ion (usually cation due to their small size) missing from their correct position and occupies position in interstitial.

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Sir the answer for question 1is not true

We have to use a=2β2r

But here u used that a =4r

No the formula is different

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we should have used a= 2β2 r relation in Q 1 ??? as it is mentioned face centered cubic lattice !

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sir ans of Q2 is wrong its”D””””””

sir ans of Q2 is wrong its”D””””””

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