Atomic Structure Test

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Atomic Structure Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Atomic weight of various elements is referred by taking standard

A
hydrogen as 1.0000

B
oxygen as 16.0000

C
carbon as 12.0000

D
nitrogen as 14.0000

Solution

Since 1961 the standard unit of atomic weight has been one-twelfth the weight of an atom of the isotope Carbon - 12. The atomic weight of Carbon is 12.0107.
Question 2
1 / -0

Which one of the following has variable valency?

A
Carbon

B
Sulphur

C
Nitrogen

D
Aluminium

Solution

Sulphur has a variable valency because Sulfur has 6 electrons in its outermost shell and has empty orbitals (3d, 4s). These orbitals can participate in bonding and allow these atoms to their valencies Sulphur can donate all 6 electrons and therefore its valency is 6 e.g. H₂SO₄. Sulphur displays valences of four (in sulphur dioxide, SO₂), and eight (in sulphur hexafluoride, SF₈).
Question 3
1 / -0

The valency of cupric ion is

A
2

B
3

C
1

D
4

Solution

When Copper has 2 valence electrons it is called as cupric. Hence valency of cupric is +2.
Question 4
1 / -0

What is the valency of an element having atomic number 54?

A
2

B
1

C
0

D
3

Solution

Xenon has atomic no. = 54, there are no valence electrons. Hence valency is zero.
Question 5
1 / -0

Which among the following represents isobars?

A
_bX^a, _{b + 1}Y^a

B
_bX^a, _cY^b

C
_bX^a, _b-1Y^a-2

D
_bX^a, _bY^a+1

Solution

Isobars are the elements having same mass number. Option 1 shows isobars having same mass number i.e., \'a\'.
Question 6
1 / -0

What is the maximum number of electrons present in N - shell?

A
8

B
18

C
64

D
32

Solution

Maximum number of electrons in N-shell is 32. The electronic configuration is 2, 8, 18, 32,........ K, L, M, N,........
Question 7
1 / -0

Which of the following correctly defines Zeeman effect?

A
Splitting of atomic spectral lines in the presence of an electric field

B
Splitting of atomic spectral lines in the presence of a magnetic field

C
Movement of electrons in the outermost energy orbital

D
Excitation of electrons from one energy level to another

Solution

Splitting of atomic spectral lines in the presence of a magnetic field is called Zeeman effect.
Question 8
1 / -0

How many electrons are there in the valence shell of an element having atomic number 16?

A
8

B
6

C
2

D
4

Solution

Number of valece electrons is 6 because of the electronic configuration 2, 8, 6.
Question 9
1 / -0

Which among the following pairs has different number of valence electrons?

A
Na⁺, Al³⁺

B
P^3-, Ar

C
Li⁺, Ar

D
O^2-, F^–

Solution

Valence electrons of Li⁺ are 2, while that of Ar is 8. In all other options, valence electrons of elements are same.
Question 10
1 / -0

Two elements A and B combine forming a compound whose molecular formula is AB₂. The valences of A and B are

A
+ 2 and - 2 respectively

B
+ 1 and - 2 respectively

C
+ 3 and - 2 respectively

D
+ 4 and - 2 respectively

Solution

Valencies of A and B can be +2 and -1 or +4 and -2 or ....... Hence, valencies of A and B according to options is +4 and -2.

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Atomic Structure Test - 2

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Atomic Structure Test - 2

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Question 1

hydrogen as 1.0000

oxygen as 16.0000

carbon as 12.0000

nitrogen as 14.0000

Solution

Question 2

Carbon

Sulphur

Nitrogen

Aluminium

Solution

Question 3

2

3

1

4

Solution

Question 4

2

1

0

3

Solution

Question 5

bXa, b + 1Ya

bXa, cYb

bXa, b-1Ya-2

bXa, bYa+1

Solution

Question 6

8

18

64

32

Solution

Question 7

Splitting of atomic spectral lines in the presence of an electric field

Splitting of atomic spectral lines in the presence of a magnetic field

Movement of electrons in the outermost energy orbital

Excitation of electrons from one energy level to another

Solution

Question 8

8

6

2

4

Solution

Question 9

Na+, Al3+

P3-, Ar

Li+, Ar

O2-, F–

Solution

Question 10

+ 2 and - 2 respectively

+ 1 and - 2 respectively

+ 3 and - 2 respectively

+ 4 and - 2 respectively

Solution

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_bX^a, _{b + 1}Y^a

_bX^a, _cY^b

_bX^a, _b-1Y^a-2

_bX^a, _bY^a+1

Na⁺, Al³⁺

P^3-, Ar

Li⁺, Ar

O^2-, F^–