NEET Exam  >  NEET Tests  >  Chemistry Class 12  >  Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - NEET MCQ

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - NEET MCQ


Test Description

20 Questions MCQ Test Chemistry Class 12 - Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT)

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) for NEET 2024 is part of Chemistry Class 12 preparation. The Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) below.
Solutions of Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) questions in English are available as part of our Chemistry Class 12 for NEET & Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) solutions in Hindi for Chemistry Class 12 course. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free. Attempt Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) | 20 questions in 30 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 12 for NEET Exam | Download free PDF with solutions
Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 1

Only One Option Correct Type
This section contains 9 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q. Bravais three-dimensional lattices are of

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 1

14 types of three-dimensional Bravais lattices (primitive and centred unit cells

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 2

The lattice site in a pure crystal cannot be occupied by

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 2

Lattice sites always contain atoms/molecules/ions. If atom is replaced by electron, then imperfection arises in the crystal and it would not be pure crystal

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 3

Number of formula units in unit cells of MgO (rock salt), ZnS (zinc blende) and Pt (fee) respectively are

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 3

Ionic compounds are held by electrostatic forces of attraction between anions and cations.  These compounds form an extensive a 3 dimensional network where the boundaries between molecules are difficult to determine. The formula of ionic compounds are the empirical formula and are called the formula units.


 

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 4

A compound is formed by elements A and B and has cubic structure. A-atoms are at the corners and B-atoms are at the face centres. Thus, it is

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 4

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 5

The mass of a unit cell of NaCL corresponds to

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 5

The number of Na+ ions present in one unit cell = 12×1/4 + 1 =4 atoms per unit cell.

The number of Cl- ions present in one unit cell = 6×1/2 + 8×1/8 = 4 atoms per unit cell.

So, each unit cell has 4 atoms of each Na+ and Cl-. Hence there are total 4 molecules of NaCl in each unit cell.

Hence B

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 6

At what angles for the first-order diffraction, spacing between two planes X respectively are λ and λ/2 ?

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 6

(c) By Bragg's equation, spacing between two planes is given by


For first-order diffraction, n =1

∴             
If d = λ, then 2 sin θ =1


if d = λ/2, then 
sin θ = 1 => θ = 90o

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 7

A solid has a structure in which W-atoms are located at the corners of a cubic lattice, OF-atoms at the centre of edges and Na atom at the centre of the cube. The formula for the compound is

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 7

In a unit cell W atoms at the corner 

O-atoms at the centre of edges = 
Na-atoms at the centre of the cube = 1
W:O:Na = 1:3:1
Hence, formula is NaWO3

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 8

The number of atoms in primitive cubic unit cell, body-centred cubic unit cell and face-centred cubic unit cell are A , B and C respectively. Select the correct values.

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 8

 (b) Number of atoms in the unit cell

where, nc = number of atoms at the corners nf = number of atoms at the faces ni = number of atoms inside 

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 9

For a second order diffraction using X-ray B ragg’s equation, for a crystal with separation between two layers as d , following graphical study was observed when varying 0 at different λ.

What is the value of d?

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 9

(c) By using Bragg’s equation,
nλ = 2d sin θ
where, n =2  
(second order diffraction)
λ = d sin θ
or
log λ = log d + log sin θ
d is constant (distance between two planes) as θ changes, X also changes.
When θ = 90°, sin 90° =1, hence log sin 90°= 0

*Multiple options can be correct
Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 10

One or More than One Options Correct Type
This section contains 3 multiple type questions. Each question has 4 choices (a), (b), (c) and (d), out of which ONE or MORE THAN ONE are correct.
In which of the following primitive cells axial distances or edge lengths (a, b, c)are different?

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 10

Correct Answer :- a,c,d

Explanation : orthorhombic : a ≠ b ≠ c, γ = 90

monoclinic : a ≠ b ≠ c, γ = 90, b ≠ 90

triclinic : a ≠ b ≠ c,  α ≠ β ≠ γ

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 11

Minimum interplanar spacing required for Bragg’s diffraction is:

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 11

Explanation: Maximum value of incident angle can be 90° for which sine is 1. Hence d = λ/2 ( nλ = 2.d.sinθ)

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 12

Which of the following Bravais lattices exist as face centered unit cell?

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 12

Orthorhombic lattice exists as all four types of unit cells. Besides primitive cell, monoclinic lattice exists only as end centered cell while tetragonal exists only as body centered lattices.

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 13

Comprehension Type
This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d).
Perovskite (A), a mineral containing calcium (o), oxygen and titanium crystallises in the following cubic unit cell:  

Q.

What is the Formula of A?

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 13

(b)
Calcium appears at eight corners, hence number of calcium atoms = 8/8 =1
Oxygen appears on six faces and two faces share one oxygen atom hence, number of oxygen atoms = 6/2 =3
Titanium appears at the centre, thus, number of Ti-atom = 1/1 =1
Thus, A is CaTi03.
Let the oxidation number of Ti = x
CaTi03
(+2) + x + 3 ( - 2 ) = 0
2 + x - 6 = 0
x = + 4

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 14

Perovskite (A), a mineral containing calcium (o), oxygen  and titanium crystallises in the following cubic unit cell:

Q. What is the oxidation number of titanium in the given lattice? 

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 14

(c)
Calcium appears at eight corners,hence number of calcium atoms = 8/8 =1
Oxygen appears on six faces and two faces share one oxygen atom hence, number of oxygen atoms = 6/2 =3
Titanium appears at the centre, thus, number of Ti-atom = 1/1 =1
Thus, A is CaTi03.
Let the oxidation number of Ti = x CaTi03
(+2) + x + 3 ( - 2 ) = 0
2 + x - 6 = 0
x = + 4

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 15

Matching List Type
Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c) and (d), out of which one is correct.

Match the primitive unit cells given in Column I with their axial angles axial distances given in Column II and select the correct answer from the codes given

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 15

 

(i) Triclinic, a b c and α β γ = 90° Thus, (i)→ (r)

(ii) Hexagonal, a = b c, α = β = 90°,γ = 120° Thus, (ii) → (s)

(iii) C u b ic ,a = b = c , α = β =γ = 90° Thus, (iii) → (p)

(iv) Tetragonal, a = b c, α = β =γ = 90

Thus, (iv) → (q)

*Answer can only contain numeric values
Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 16

One Integer Value Correct Type
This section contains 5 questions, when worked out will result in an integer value from 0 to 9 (both inclusive)
Q. A unit cell is characterised by how many parameters?


Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 16

(6) Edge length : a, b, c and angles between the edges :  α,β,γ

*Answer can only contain numeric values
Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 17

How many types of primitive unit cells are there?


Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 17

 Primitive unit cells are

(i) Cubic

(ii) Tetragonal

(iii) Orthorhombic

(iv) Hexagonal

(v) Rhombohedral

(vi) Monoclinic

(vii) Triclinic

Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 18

In which of the following Bravais lattices, not all axial angles are right angles?

Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 18

A rhombohedral is a prism whose base is shaped as a non-square rhombus. Hence two of its six faces are rhombuses while others are rectangles. This results in a geometry for which two of the axial angles are right angles but the third is not.

*Answer can only contain numeric values
Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 19

A second order Bragg’s diffraction of X-rays from a set of parallel planes separated by 1.155 occurs at an angle 60° using wavelength of x. What is the value of x?


Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 19

(1) By Bragg's equation,

n = 2 (second order diffraction)

 

*Answer can only contain numeric values
Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 20

Number of unit cells in 240 g of element X (atomic mass 40) which crystallises in bcc pattern in yN 0. What is the value of y?


Detailed Solution for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) - Question 20

(3)

Number of atoms in one unit cell of bcc structure =2
Thus, number of unit cells =  
Thus, y = 3

135 videos|348 docs|182 tests
Information about Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) Page
In this test you can find the Exam questions for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT) solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Unit Cells, Lattices & Bragg's Equation (Old NCERT), EduRev gives you an ample number of Online tests for practice

Top Courses for NEET

135 videos|348 docs|182 tests
Download as PDF

Top Courses for NEET