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Solution for Class 12, Chemistry, Solid State

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Second nearest neighbour of

Cl^{-}

CsCl

8
6
16
10

Topic:

Solid State

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P

atoms at corners \&

Q

atoms at face centers. If atoms along one of the face diagonals are removed. formula of solid would be

$P_{2} Q_{3}$
$P_{4} Q_{3}$
$P_{4} Q_{5}$
$P_{3} Q_{10}$

Topic:

Solid State

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2.11 Calculate the mass of ascorbic acid (Vitamin

C_{,}, C_{6} H_{8} O_{f}

) to be dissolved in

75 g

of acetic acid to lower its melting point by

1. 5^{\circ} C . K_{r} = 3.9 K kg mol

2.12 Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving

1.0 g

of polymer of molar mass 185,000 in

450 mL

3 7^{\circ} C

2.7

Abnormal We know that ionic compounds when dissolved in water dissociate into Molar cations and anions. For example, if we dissolve one mole of

KCl (74.5 g)

Masses in water, we expect one mole each of

K^{'}

Cl^{-}

ions to be released in the solution. If this happens, there would be two moles of particles in

Topic:

Solid State

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Board \& Competitive Exams (Level-1) 32. F-centres in an ionic crystals are

Lattice sites containing electrons
Interstitial sites containing electrons
Lattice sites that are vacant
Interstitial sites containing cations

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Solid State

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A, B

C

crystallise into a cubic solid lattice. Atoms A occupy the corners, B atoms, the cube centres and

C

atoms, the edge. The formula of the compound is

$ABC$
$ABC_{2}$
$ABC_{3}$
$A BC$ .

Topic:

Solid State

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the shape of the orbital that is occupied by the electron.

Principal quantum number describes the relative spatial orientation of the orbitals in a given subshell.
Magnetic orbital quantum number has values from $- l$ to $+ /$ through zero.

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Solid State

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Shapes of atomic orbitals 62. Which of the following is CORRECT?

A boundary surface diagram encloses a region where the probability of finding electron is typically more than $50%$ .
A boundary surface diagram is a good representation of shape of an orbital.
The electron cloud of $2 s$ orbital shows two nodes.
The probability of finding an electron at a given point in an atom is proportional to $Ψ$ .

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Solid State

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A node is a region with nearly probability density.

zero
$50%$
$75%$
$100%$

Topic:

Solid State

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For s-orbitals, as the value of

n

increases, the size of the s-orbital

increases
decreases
remains the same
first increases then decreases

Topic:

Solid State

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Question 10

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Each p-orbital has lobe(s) on the two sides of a nodal plane passing through the nucleus,

zero
one
two
three

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Solid State

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Question 11

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2 p_{x}

2 p_{y}

orbitals differ in their

orientation
energy
shape
' $l$ ' value

Topic:

Solid State

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Question 12

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Chapter 04: Structure of Atom 68. Which of the following is INCORRECT?

d-orbitals have 3 orientations.
Each p-orbital resembles a dumb-bell.
$d_{x^{2} - y^{2}}$ is dumb-bell shaped and lies along the $x$ and $y$ axes.
The three p-orbitals are perpendicular to each other.

Topic:

Solid State

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Question 13

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Maximum number of electrons that can be accommodated in '

M

18
32
2 (D) 8

Topic:

Solid State

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Question 14

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The quantum numbers

n = 5, l = 3

represent the orbital.

(A) 5 s (B) 5 f

$5 d$
$5 p$

Topic:

Solid State

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Question 15

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The total number of subshells in the

N

3
4
5
7

Topic:

Solid State

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Question 16

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The number of orbitals in a subshell is equal to

(A) n^{2} (B) 2 l

$(2 l + 1)$
$2 (n - l)$

Topic:

Solid State

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Question 17

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The maximum number of electrons in

s, p

and d-subshells are respectively.

2,2 and 4
2,4 and 6
2,6 and 10
2,6 and 12

Topic:

Solid State

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Question 18

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Which of the following orbitals does NOT exin1

31
$3 f$
$5 p$
$7 s$

Topic:

Solid State

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Question 19

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If in diamond, there is a unit cell of carbon atoms as fcc and if carbon atom is sp

^{3}

, what fractions of voids are occupied by carbon atom?

$25%$ tetrahedral
$50%$ tetrahedral
$25%$ octahedral
$50%$ octahedral

Topic:

Solid State

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Question 20

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A compound forms hexagonal close-packed structure. What is the total number of voids in

0.5

$5.0 \times 1 0^{23}$
$9.0 \times 1 0^{23}$
$8.0 \times 1 0^{- 23}$
$2 \times 1 0^{- 23}$

Topic:

Solid State

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