Solid State Test

Result

Solid State Test - 70

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Weekly Quiz Competition

Question 1
1 / -0

Crystal $$AB$$ shows $$ZnS$$ (zinc blend) type structure if the radius of $$B^{-}$$ in $$50\ pm$$ then the radius of $$A^{+}$$, if edge length of unit cell is $$160\ pm$$.

A
$$11.25\ pm$$

B
$$27.94\ pm$$

C
$$15.25\ pm$$

D
$$19.28\ pm$$

Solution
Question 2
1 / -0

If the same type of atoms are packed in hexagonal closest packing (hcp) and cubical closest packing(ccp) separately, then:

A
Density of hcp will be greater than ccp

B
Density of hcp will be smaller than ccp

C
Density of hcp will be equal to ccp

D
Density of hcp may be equal or greater than ccp depending upon the temperature of the system.

Solution
Question 3
1 / -0

$$KF$$ has $$NaCl$$ structure. The edge length of its unit cell has been found to be $$537.6\ pm$$. The distance between $$K^{+}$$ and $$F^{-}$$ in $$KF$$ is :

A
$$537.6 \ pm$$

B
$$268.8\ pm$$

C
$$107.5\ pm$$

D
$$Cannot\ be\ calculated$$

Solution
Question 4
1 / -0

A metallic element exists as cubic lattice. Each edge of the unit cell is $$ 2.88 \mathring {A} .$$ The density of the metal is $$ 7.20\ g cm^{-3}.$$ How many unit cell will be present in 100 g of the metal?

A
$$ 6.85 \times 10^2 $$

B
$$ 5.82 \times 10^{23} $$

C
$$ 4.37 \times 10^5 $$

D
$$ 2.12 \times 10^6 $$

Solution
Question 5
1 / -0

Which of the following solids have tetragonal crystal system

A
$$NaCl$$

B
$$ZnS$$

C
$$TiO_{2}$$

D
$$ZnO$$
Question 6
1 / -0

In orthorhombic, the value of $$a, b$$ and $$c$$ are respectively $$4.2\ A$$, $$8.6\ A$$ and $$8.3\ A$$.Given the molecular mass of the solute is $$155\ gm\ mol^ {-1}$$ and that of density is $$3.3\ gm\ cc$$ the number of formula units per unit cell is

A
$$2$$

B
$$3$$

C
$$4$$

D
$$6$$

Solution
Question 7
1 / -0

How many types of crystalline solids are found?

A
$$2$$

B
$$6$$

C
$$4$$

D
none of these
Question 8
1 / -0

Packing fraction in diamond is (approximately)

A
$$74\%$$

B
$$78\%$$

C
$$68\%$$

D
$$34\%$$

Solution
Question 9
1 / -0

Packing fraction in $$2D-$$hexagonal arrangement of identical sphere is

A
$$\dfrac{\pi}{3\sqrt {2}}$$

B
$$\dfrac{\pi}{3\sqrt {3}}$$

C
$$\dfrac{\pi}{2\sqrt {3}}$$

D
$$\dfrac{\pi}{6}$$

Solution
Question 10
1 / -0

The density of nickel (face centered cubic cell) is $$8.94\ g/cm^3$$ at $$20^oC$$. What is the radius of the atom? (Atomic weight: $$Ni=59$$)

A
$$0.124 \ nm$$

B
$$0.136 \ nm$$

C
$$0.149 \ nm$$

D
$$0.110 \ pm$$

Solution