NEET Exam  >  NEET Tests  >  Chemistry Class 12  >  Test: Imperfections in Solids (Old NCERT) - NEET MCQ

Test: Imperfections in Solids (Old NCERT) - NEET MCQ


Test Description

15 Questions MCQ Test Chemistry Class 12 - Test: Imperfections in Solids (Old NCERT)

Test: Imperfections in Solids (Old NCERT) for NEET 2024 is part of Chemistry Class 12 preparation. The Test: Imperfections in Solids (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Imperfections in Solids (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Imperfections in Solids (Old NCERT) below.
Solutions of Test: Imperfections in Solids (Old NCERT) questions in English are available as part of our Chemistry Class 12 for NEET & Test: Imperfections in Solids (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: Imperfections in Solids (Old NCERT) | 15 questions in 15 minutes | Mock test for NEET preparation | Free important questions MCQ to study Chemistry Class 12 for NEET Exam | Download free PDF with solutions
Test: Imperfections in Solids (Old NCERT) - Question 1

Which is the defect represented by the given figure

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 1

In Frenkel defect, the smaller cation is dislocated from its normal position to an interstitial site.

Test: Imperfections in Solids (Old NCERT) - Question 2

What is the effect of Frenkel defect on the density of ions solids?

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 2

In Frenkel defect, ions get displaced from their original position and move to interstitial sites. Hence, there is no change in the density of the crystal.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Imperfections in Solids (Old NCERT) - Question 3

Alkali halides do not show Frenkel defect because

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 3

Frenkel defect is not shown by alkali metals because cations and anions have almost same size and cations cannot be accommodated in interstitial sites.

Test: Imperfections in Solids (Old NCERT) - Question 4

What type of stoichiometric defect is shown by ZnS?

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 4

The stoichiometric defect shown by ZnS is Frenkel defect which is due to the large difference in the size of the ions, i.e. due to the small size of Zn2+.

Test: Imperfections in Solids (Old NCERT) - Question 5

In Schottky defect,

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 5

In ionic crystals, the Schottky defect forms when oppositely charged ions leave their lattice sites, creating vacancies. These vacancies are formed in stoichiometric units, to maintain an overall neutral charge in the ionic solid.

Test: Imperfections in Solids (Old NCERT) - Question 6

Which type of crystal defect is shown in the given figure?

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 6

Equal number of cations and anions are missing from the crystal.

Test: Imperfections in Solids (Old NCERT) - Question 7

Silver halides generally show

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 7

Silver halides generally show both Frenkel and Schottky defects.

Test: Imperfections in Solids (Old NCERT) - Question 8

In the given crystal structure what should be the cation X which replaces Na+ to create a cation vacancy?

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 8

Each Sr2+ in the NaCl crystal replaces two Na+ ions. It occupies the site of one ion and the other remain vacant creating a cation vacancy.

Test: Imperfections in Solids (Old NCERT) - Question 9

An electron trapped in an anion site in a crystal is called

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 9

F-centres are electron trapped anion site which are responsible for colour.

Test: Imperfections in Solids (Old NCERT) - Question 10

In the following figure, the blank X is known as __________ and why?

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 10

The anionic sites occupied by the unpaired electrons are called F-centres from the German word Farbenzenter for colour centre.

Test: Imperfections in Solids (Old NCERT) - Question 11

The anionic sites occupied by unpaired electrons are called F-centres or colour centres. They impart (X) colour to the crystals of NaCl. Excess of lithium makes LiCl crystals (Y) and excess of potassium makes KCl crystals (Z). (X), (Y) and (Z) are

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 11

F-centres impart yellow colour to the crystal of NaCl when heated in an atmosphere of sodium vapour. Similarly, excess of lithium makes LiCl crystals pink and excess of potassium makes KCl violet(or lilac)

Test: Imperfections in Solids (Old NCERT) - Question 12

Zinc oxide loses oxygen on heating according to the reaction,

It becomes yellow on heating because

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 12

Zn2+ ions and electrons moves to interstitial sites and F-centres are created which impart yellow colour to ZnO.

Test: Imperfections in Solids (Old NCERT) - Question 13

 Which of the following will have metal deficiency defect?

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 13

FeO is mostly found with a composition of  Fe0.95O.(Ranges from Fe0.93O - Fe0.96O). In crystal of FeO, some Fe2+ cations are missing and the loss of positive charge is made up by the presence of the required number of Fe3+ ions.

Test: Imperfections in Solids (Old NCERT) - Question 14

Experimentally it was found that a metal oxide has formula M0.98O. Metal M, is present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 14

Let the fraction o f metal which exists as M2+ be x. Then the fraction of metal as M2+ = (0.98 - x)
3x + 2( 0.98 - x) = 2
x + 1.96 = 2
x = 0.04
% of M3+ = 0.04/0.98 x 100
= 4.08%

Test: Imperfections in Solids (Old NCERT) - Question 15

Mark the incorrect pair from the following.

Detailed Solution for Test: Imperfections in Solids (Old NCERT) - Question 15

Fe0 93O is a metal deficiency defect. In FeO, some Fe2+ ions are missing and the loss of positive charge is made up by Fe3+ ions.

135 videos|347 docs|182 tests
Information about Test: Imperfections in Solids (Old NCERT) Page
In this test you can find the Exam questions for Test: Imperfections in Solids (Old NCERT) solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Imperfections in Solids (Old NCERT), EduRev gives you an ample number of Online tests for practice

Up next

135 videos|347 docs|182 tests
Download as PDF

Up next