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NEET Exam  >  NEET Test  >  Chemistry CUET UG Mock Test Series 2026  >  Test: Imperfections in Solids (Old NCERT) - NEET MCQ

Chemistry CUET UG Test: Imperfections in Solids (Old NCERT) Free Online


MCQ Practice Test & Solutions: Test: Imperfections in Solids (Old NCERT) (15 Questions)

You can prepare effectively for NEET Chemistry CUET UG Mock Test Series 2026 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Imperfections in Solids (Old NCERT)". These 15 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 15 minutes
  • - Number of Questions: 15

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Test: Imperfections in Solids (Old NCERT) - Question 1
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Which is the defect represented by the given figure

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

Detailed Solution: 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.

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Test: Imperfections in Solids (Old NCERT) - Question 3
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Alkali halides do not show Frenkel defect because

Detailed Solution: 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
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What type of stoichiometric defect is shown by ZnS?

Detailed Solution: 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
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In Schottky defect,

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

Detailed Solution: Question 6

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

Test: Imperfections in Solids (Old NCERT) - Question 7
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Silver halides generally show

Detailed Solution: Question 7

Silver halides generally show both Frenkel and Schottky defects.

Test: Imperfections in Solids (Old NCERT) - Question 8
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In the given crystal structure what should be the cation X which replaces Na+ to create a cation vacancy?

Detailed Solution: 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
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An electron trapped in an anion site in a crystal is called

Detailed Solution: Question 9

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

Test: Imperfections in Solids (Old NCERT) - Question 10
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In the following figure, the blank X is known as __________ and why?

Detailed Solution: 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
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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: 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
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Zinc oxide loses oxygen on heating according to the reaction,

It becomes yellow on heating because

Detailed Solution: 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
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 Which of the following will have metal deficiency defect?

Detailed Solution: 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
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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: 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
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Mark the incorrect pair from the following.

Detailed Solution: 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.

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About this NEET Practice Test

This test contains 15 MCQs on Imperfections in Solids (Old NCERT) with detailed solutions for each question. It is part of the Chemistry CUET UG Mock Test Series 2026 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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