## The Solid State Quiz-6

IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. Schottky defect to crystals is observed when
•  Unequal number of cations and anions are missing from the lattice
•  Equal number of cations and anions are missing from the lattice
•  An ion leaves its normal site and occupies an interstitial site
•  Density of the crystal is increased
Solution
(b) All factual statements

Q2.A crystal is made up of particles X, Y, and Z. X forms fcc packing. Y occupies all octahedral voids of X and Z occupies all tetrahedral voids of X. It all the particles alongone body diagonal are removed, then the formula of crystal would be
•  XYZ2
•  X2YZ2
•  X8Y4Z5
•  X5Y4Z8
Solution

Q3.

•  186 amu
•  93 amu
•  46.5 amu
•  43 amu
Solution

Q4. A compound formed by elements A and B crystallizes in the cubic structure where A atoms are at the face-centers. The formula of the compound is
•  AB3
•  AB
•  A3B
•  A2B2
Solution
(a) Number of A atoms=8×1/8=1 Number of B atoms=6×1/2=3 Formula =AB3

Q5. In a tetragonal crystal
•  a=b=c, Î±=Î²=90°≠Î³
•  Î±=Î²=Î³=90°, a=b≠c
•  Î±=Î²=Î³=90°, a≠b≠c
•  Î±=Î²=90°, Î³=120°,a=b≠c
Solution
(b) Factual statement

Q6. Pure silicon and germanium are
•  Conductors
•  Insulators
• Semiconductors
•  May be any one of the above
Solution
(b) Factual statement

Q7.Which of the following has Frenkel defect?
•  Sodium chloride
•  Graphite
•  Silver bromide
•  Diamond
Solution

Q8. In the calcium fluoride structure, the coordination number of the cations and the anions are, respectively
•  6 and 6
•  8 and 4
•  4 and 4
•  4 and 8
Solution
(b) In fluorite-type structure, CN=8:4 (factual statement)

Q9. In a solid AB having the NaCl structure, A atom occupies the corners of the cubic unit cell. If all the face-centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is
•  AB2
•  A2B
•  A4B3
•  A3B4
Solution

Q10. Na and Mg crystallize in bcc- and fcc-type crystals, the ratio of number of atoms present in the unit cell of their respective crystal is
•  1
•  0.5
•  3
• 4
Solution

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