Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 56

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Weekly Quiz Competition

Question 1
1 / -0

Electron affinity depends on

A
Atomic size

B
Nuclear charge

C
Atomic number

D
Atomic size and nuclear charge both

Solution

Electron affinity depends on both atomic size and nuclear charge.
Question 2
1 / -0

The second ionisation potential of an element $$M$$ is the energy required to

A
Remove one mole of electron from one mole of gaseous anion

B
Remove one mole of electron from one mole of gaseous cation of the element

C
Remove one mole of electron from one mole of monovalent gaseous cation of the element

D
Remove $$2$$ mole of electron from one mole of gaseous atoms

Solution

The second ionisation energy is the energy required to remove an electron from monovalent gaseous cation of the element.
Question 3
1 / -0

An atom of an element has electronic configuration $$2,8,1$$. Which of the following statement is correct

A
The element's valency is $$7$$

B
The element exists as a diatomic molecule

C
The element is of non-metallic nature

D
The element forms a basic oxide

Solution

The element is metallic in nature and will form basic oxide.
Question 4
1 / -0

The most common oxidation state of an element is $$-2$$. The number of electrons present in its outermost shell is

A
4

B
2

C
6

D
8

Solution

Oxygen has $$6$$ electrons in the outer most shell and shows common oxidation state $$-2$$
Question 5
1 / -0

Which of the following statement is not correct for the element having electronic configuration $$1s^{2} 2s^{2} 2p^{6} 3s^{1}$$

A
It is a monovalent electropositive

B
It forms basic oxide

C
It is a non-metal

D
It has low electron affinity

Solution

It is a metal. Since it has tendency to lose an electron inorder to attain stable configuration.
Question 6
1 / -0

Increase order of electron affinity is

A
$$ N < O < Cl < Al $$

B
$$ O < N < Al < Cl $$

C
$$ N < Al < O < Cl $$

D
$$ Cl < N < O < Al $$

Solution

Nitrogen has lowest electron affinity because of half-filled p-orbital which leads to extra stability. While oxygen has lower electron affinity than chlorine beacuse of smaller size and interelectronic repulsion with incoming electron. So correct order $$N<Al<O<Cl$$
Question 7
1 / -0

Which of the following pairs of species has the same electronic configuration?

A
$$Zn^{2+}$$ and $$Ni^{2+}$$

B
$$Co^{+3}$$ and $$Ni^{4+}$$

C
$$Co^{2+}$$ and $$Ni^{2+}$$

D
$$Ti^{4+}$$ and $$V^{3+}$$

Solution

The electron configuration of
$$Zn^{2+}$$is $$1s^22s^22p^63s^23p^63d^{10}$$
$$Ni^{2+}$$ is $$[Ar]3d^8$$
$$Ni^{4+}$$ is $$[Ar]3d^6$$
$$Co^{3+}$$=$$[Ar]3d^6$$
$$Co^{2+}$$= $$[Ar] 4s^23d^7$$
Option B is a correct answer.
Question 8
1 / -0

Which of the following has the least electron affinity in $$kJmol^{-1}$$

A
Oxygen

B
Carbon

C
Nitrogen

D
Boron

Solution

Nitrogen has least electron affinity because of its half-filled 2p orbital.
Question 9
1 / -0

On going from right to left in a period in the periodic tables the electronegativity of the elements

A
Increases

B
Decreases

C
Remain unchanged

D
Decreases first then increases

Solution

Electronegativity increases on moving from left to right in a period.
Question 10
1 / -0

The electronic structure $$(n-1)d^{1-10}ns^{0-2}$$ is characteristic of

A
Transition elements

B
Lanthanides

C
Actinides

D
Rare gases

Solution

According to $$(n+l)$$ rule last electron will be filled in $$(n-1)d$$ orbital. Hence the given electyronic configuration belongs to d-block or transition metals.

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Classification of Elements and Periodicity in Properties Test - 56

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Classification of Elements and Periodicity in Properties Test - 56

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SHARING IS CARING

Question 1

Atomic size

Nuclear charge

Atomic number

Atomic size and nuclear charge both

Solution

Question 2

Remove one mole of electron from one mole of gaseous anion

Remove one mole of electron from one mole of gaseous cation of the element

Remove one mole of electron from one mole of monovalent gaseous cation of the element

Remove $$2$$ mole of electron from one mole of gaseous atoms

Solution

Question 3

The element's valency is $$7$$

The element exists as a diatomic molecule

The element is of non-metallic nature

The element forms a basic oxide

Solution

Question 4

4

2

6

8

Solution

Question 5

It is a monovalent electropositive

It forms basic oxide

It is a non-metal

It has low electron affinity

Solution

Question 6

$$ N < O < Cl < Al $$

$$ O < N < Al < Cl $$

$$ N < Al < O < Cl $$

$$ Cl < N < O < Al $$

Solution

Question 7

$$Zn^{2+}$$ and $$Ni^{2+}$$

$$Co^{+3}$$ and $$Ni^{4+}$$

$$Co^{2+}$$ and $$Ni^{2+}$$

$$Ti^{4+}$$ and $$V^{3+}$$

Solution

Question 8

Oxygen

Carbon

Nitrogen

Boron

Solution

Question 9

Increases

Decreases

Remain unchanged

Decreases first then increases

Solution

Question 10

Transition elements

Lanthanides

Actinides

Rare gases

Solution

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