Chemical Periodicity Test

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Chemical Periodicity Test - 4

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Weekly Quiz Competition

Question 1
4 / -1

The correct arrangement of increasing order of atomic radii among Na, K, Mg, Rb is

A
Mg<K<Na<Rb

B
Mg<Na<K<Rb

C
Mg<Na<Rb<K

D
Na<K<Rb<Mg

Solution

Atomic radii decrease along the period and increase down the group. Hence the order is :

Mg<Na<K<Rb
Question 2
4 / -1

The first ionisation energies of alkaline earth metals are higher than those of the alkali metals. This is because

A
there is increase in the nuclear charge of the alkaline earth metal

B
there is decrease in the nuclear charge of the alkaline earth metal

C
there is no change in the nuclear charge

D
none of these

Solution

Along the period from left to right, atomic number increases and, therefore, nuclear charge also increases. So first ionization energies of alkaline earth metals are higher than those of the alkali metals of the same period because of higher nuclear charge.
Question 3
4 / -1

Which ionisation potential (IP) in the following equations involves the greatest amount of energy?

A
Na→Na⁺+e⁻

B
K⁺→K²⁺+ e⁻

C
C²⁺→ C³⁺ + e⁻

D
Ca⁺→Ca²⁺+e⁻

Solution
Question 4
4 / -1

The first ionisation energy of lithium will be

A
greater than Be

B
less than Be

C
equal to that of Na

D
equal to that of F

Solution

Ionisation energy increases across the periodic table.
Question 5
4 / -1

Which has maximum first ionization potential

A
C

B
N

C
B

D
O

Solution

It has maximum ionization energy due to half-filled orbitals.
Question 6
4 / -1

The electron affinity of halogens are F−322,Cl−347,Br−324,I=295kJmol−1. The higher value of Cl as compared to that of F is due to:

A
Weaker electron-electron repulsion in Cl

B
Higher atomic radius of F

C
Smaller electronegativity of F

D
More vacant P - subshell in Cl

E
a

Solution

Electron affinity value of Cl is higher than of F as Cl belongs to the 3rd period while F belongs to 2nd period. In Cl, electron-electron repulsion forces are weaker than that of F.
Question 7
4 / -1

Which of the following properties show gradual decrease with increase in atomic number across a period in the periodic table?

A
Electron affinity

B
Ionisation potential

C
Electronegativity

D
Size of atom

Solution

Size of atom decreases with increase in atomic number across the period in Periodic Table due to increase in effective nuclear charge.
Question 8
4 / -1

With increasing atomic number in a certain period

A
The chemical reactivity decreases

B
The chemical reactivity increases

C
The electropositive character increases

D
he electronegative character increases

Solution

The electronegative character increases as the size decreases.
Question 9
4 / -1

Which of these have no unit

A
Electronegativity

B
Electron affinity

C
Ionisation energy

D
Excitation potential

Solution

Electronegativity is the property of a bonded atom. The relative tendency on an atom to attract the shared pair of electron toward itself is called electronegativity.
Question 10
4 / -1

Keeping in view the periodic law and the periodic table suggest which of the following elements should have the maximum electronegative character

A
P

B
As

C
Bi

D
Sb

Solution

Electronegativity decreases down the group.

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Re-Attempt Weekly Quiz Competition

Chemical Periodicity Test - 4

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Chemical Periodicity Test - 4

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Question 1

Mg<K<Na<Rb

Mg<Na<K<Rb

Mg<Na<Rb<K

Na<K<Rb<Mg

Solution

Question 2

there is increase in the nuclear charge of the alkaline earth metal

there is decrease in the nuclear charge of the alkaline earth metal

there is no change in the nuclear charge

none of these

Solution

Question 3

Na→Na++e−

K+→K2++ e−

C2+ → C3+ + e−

Ca+→Ca2++e−

Solution

Question 4

greater than Be

less than Be

equal to that of Na

equal to that of F

Solution

Question 5

C

N

B

O

Solution

Question 6

Weaker electron-electron repulsion in Cl

Higher atomic radius of F

Smaller electronegativity of F

More vacant P - subshell in Cl

a

Solution

Question 7

Electron affinity

Ionisation potential

Electronegativity

Size of atom

Solution

Question 8

The chemical reactivity decreases

The chemical reactivity increases

The electropositive character increases

he electronegative character increases

Solution

Question 9

Electronegativity

Electron affinity

Ionisation energy

Excitation potential

Solution

Question 10

P

As

Bi

Sb

Solution

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Na→Na⁺+e⁻

K⁺→K²⁺+ e⁻

C²⁺→ C³⁺ + e⁻

Ca⁺→Ca²⁺+e⁻