The Solid State Set-1

Practice Important MCQs for Solid States — Chemistry, Class 12.

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Q1. Chottky defect defines imperfection in the lattice structure of

(A)

solid

(B)

gas

(C)

liquid

(D)

plasma

Q2. An $AB_2$ type structure is found in

(A)

NaCl

(B)

$CaF_2$

(C)

$Al_2O_3$

(D)

$N_2O$

Q3. An element (atomic mass $100\ g/mol$ ) having $bcc$ structure has unit cell edge $400\ pm$ . The density of element is (No. of atoms in $bcc$ , $Z = 2$ )

(A)

$2.144\ g/cm^3$

(B)

$7.289\ g/cm^3$

(C)

$5.188\ g/cm^3$

(D)

$10.376\ g/cm^3$

Q4. What is the coordination number of sodium in $Na_2O$ ?

(A)

(B)

(C)

(D)

Q5. The compound, found in nature in gas phase but ionic in solid state is

(A)

$PCl_5$

(B)

$CCl_4$

(C)

$PCl_3$

(D)

$POCl_3$

Q6. The $Ca^{2+}$ and $F^–$ are located in $CaF_2$ crystal, respectively at face centred cubic lattice points and in

(A)

Tetrahedral voids

(B)

Half of tetrahedral voids

(C)

Octahedral voids

(D)

Half of octahedral voids

Q7. The coordination number in $hcp$ is

(A)

(B)

(C)

(D)

Q8. The space lattice of graphite is

(A)

Cubic

(B)

Tetragonal

(C)

Rhombic

(D)

Hexagonal

Q9. Coordination numbers of $Zn^{2+}$ and $S^{2–}$ in the crystal structure of wurtzite are

(A)

4, 4

(B)

6, 6

(C)

8, 4

(D)

8, 8

Q10. Gold has a face centred cubic lattice with an edge length of the unit cube of $407\ pm$ . Assuming the closest packing, the diameter of the gold atom is

(A)

$576.6\ pm$

(B)

$287.8\ pm$

(C)

$352.5\ pm$

(D)

$704.9\ pm$

Q11. Which is not correct about the Schottky defects?

(A)

Both cations and anions are missing from their lattice sites without affecting the stoichiometry of the compound

(B)

Because of presence of holes the lattice energy decreases.

(C)

The presence of holes causes the density of the crystal to decrease.

(D)

The defect increases the electrical of the ions into the holes.

Q12. The existence of a substance in more than one solid modifications is known as

(A)

isomorphism

(B)

Polymorphism

(C)

Amorphism

(D)

Allotropy

Q13. An element (atomic mass = $100\ g / mol$ ) having $bcc$ structure has unit cell edge $400\ pm$ . Then, density of the element is

(A)

$10.376\ g/cm^3$

(B)

$5.188\ g/cm^3$

(C)

$7.289\ g/cm^3$

(D)

$2.144\ g/cm^3$

Q14. If AgI crystallises in zinc blende structure with $I^–$ ions at lattice points. What fraction of tetrahedral voids is occupied by $Ag^+$ ions?

(A)

$25\%$

(B)

$50\%$

(C)

$100\%$

(D)

$75\%$

Q15. Which set of following characteristics for $ZnS$ crystal is correct?

(A)

Coordination number (4 : 4); $ccp$ ; $Zn^{2+}$ ion in the alternate tetrahedral voids

(B)

Coordination number (6 : 6); $hcp$ ; $Zn^{2+}$ ion in all tetrahedral voids.

(C)

Coordination number (6 : 4); $hcp$ ; $Zn^{2+}$ ion in all octahedral voids

(D)

Coordination number (4 : 4); $ccp$ ; $Zn^{2+}$ ion in all tetrahedral voids.

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