Define Isotop?
Define Mass number?
Define atomic number?
An element having atomic number and mass number is 20 and 40 respectively. Then name element and find number of neutron of the element?

Topic:

Atomic Structure

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Question 8

Group - C 3. Describe briefly any two of the following.

[4 \times 2 = 8]

Write the postulates of Bohr's atomic Model?
Explain briefly Rutherford's gold foil experiment?
Explain briefly the four types of quantum numbers?

Topic:

Atomic Structure

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Question 9

The number of atoms present in

1 ml

NH_{2}

at STP is :

$17 \times 6.022 \times 1 0^{23}$
$6.022 \times 1 0^{23}$
$1.07 \times 1 0^{20}$
None of these

Topic:

Atomic Structure

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Question 10

8 gms

O_{2}

at S.T.P will occupy a volume of

$22.4$ litres
$16.4$ litres
$5.6$ litres
$12.2$ litres

Topic:

Atomic Structure

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Question 11

Which of the following contains largest number of molecules ?

$2 gms H_{2}$
$2 gms N_{2}$
$2 gms O_{2}$
None of these

Topic:

Atomic Structure

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Question 12

Pre-Medical: Chemistry 85 43. In the following transition which statement is correct

$E_{3 - 1} = E_{3 - 2} - E_{2 - 1}$
$λ_{3} = λ_{1} + λ_{2}$
$v_{3} = v_{2} + v_{1}$
All of these

Topic:

Atomic Structure

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Question 13

The atomic weight of an element is double its atomic number. If there are three electrons in

2 p

sub-shell, the element is :-

$C$
$N$
0
$Ca$

Topic:

Atomic Structure

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Question 14

Q.2) Answer the following.

What is formula mass of a substance?
Define - Compound.
What is one amu?
Explain the screeing effect?
What are isoelectronic species?
How many particles are present in 1 mole of a substance?

Topic:

Atomic Structure

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Question 15

Calculate the wavenumber for the longest wavelength transition in the Balmer series of atomic hydrogen.

Topic:

Atomic Structure

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Question 16

Problem 2.11 Calculate the energy associated with the first orbit of

He^{+}

. What is the radius of this orbit?

Topic:

Atomic Structure

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Question 17

A given orbital is labeled by the

$s$ - orbital
p-orbital
d-orbital

Topic:

Atomic Structure

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Question 18

An orbital containing electron having quantum number

n = 4, 1 = 3, m = 0

and

s = - \frac{1}{2}

is called

$3 s$ orbital
$3 p$ orbital
$4 d$ orbital
4 f orbital

Topic:

Atomic Structure

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Question 19

The maximum number of orbital electrons in a subshell is given by the expression

$4 l - 2$
$(2 ∣ + 1)$
$2 (21 + 1)$
$2 n^{2}$

Topic:

Atomic Structure

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Question 20

The electrons present in K-shell of the atom will differ in

(1) principal quantum number (2) azimut

azimuthal quantum number
spin quantum number

Topic:

Atomic Structure

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