Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

Which configuration represents a noble gas

A
$$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2$$

B
$$1s^2 2s^2 2p^6 3s^2 3p^6$$

C
$$1s^2 2s^2 2p^6 3p^6$$

D
$$1s^2 2s^2 2p^6 3s^2$$

Solution

Coorect option is B. It has completely filled orbitals.
Question 2
1 / -0

Which of the following pair has elements containing same number of electrons in the outermost orbit

A
$$N, O$$

B
$$Na, Ca$$

C
$$As, Bi$$

D
$$Pb, Sb$$

Solution

$$As$$ and $$Bi$$; both contains same number of electrons in outermost orbital since they belong to same group (i.e. $$group\ 15$$).
Question 3
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The electronic configuration of an atom $$A$$ is $$1s^2 2s^2 2p^6 3s^2p^6 3d^{10} 4s^2 4p^3$$. The chemistry of $$A$$ is therefore likely to be similar to that of

A
Chlorine

B
Nitrogen

C
Oxygen

D
Boron

Solution

Nitrogen has similar electronic configuration since it has its valence electrons in $$2s^{2} 2p^{3}$$.
Question 4
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Electron affinity is the

A
Energy absorbed when an electron is added to an isolated atom in the gaseous state

B
Energy released when an electron is added to an isolated atom in the gaseous state

C
Energy required to take out an electron from an isolated gaseous state

D
Power of an atom to attract an electron to itself

Solution

Electron affinity is the energy released when an electron is added to an isolated atom in the gaseous state.
Question 5
1 / -0

In comparison with akali metals, the electron affinity of halogen is

A
Very high

B
Very low

C
Nearly same

D
Exactly same

Solution

Electron affinity of halogen is very high because they can easily accept electrons inorder to have noble gas configuration.
Question 6
1 / -0

Nitrogen has lower electron affinity than its preceding element carbon because

A
Electron affinity decrease along a period

B
Electron affinity generally increase along a period

C
Nitrogen atom has half-filled $$p-$$orbital.

D
Nitrogen is $$p-$$block element.

Solution

Since N has half-filled p-orbital which provides extra stability. So it has lower electron affinity than carbon.
Question 7
1 / -0

An element has the electronic configuration $$1s^22s^2 2p^6 3s^2 3p^6 3d^5 4s^1$$. It is a

A
$$s-$$ block element

B
$$p-$$ block element

C
$$d-$$ block element

D
Inert gas

Solution

It belongs to d-block as d-orbital is not completley filled. The given electronic configuration belongs to Cr atom and it's a d-block element.
Question 8
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The most important active step in the development of periodic table was taken by

A
Mendeleev

B
Dalton

C
Avogadro

D
Cavendish

Solution

The most important active step in the development of periodic table was taken by Mendeleev since though others have also made significant contributions towards classification of elements, he elevated the progress made in that direction much more than anyone else.
Hence Correct option is $$A$$.
Question 9
1 / -0

Last element of group $$IV$$ is found to be

A
Strong metallic

B
Weak metallic

C
Strong non-metallic

D
Weak non-metallic

Solution

Down the group metallic character increases. Group IV shows variation from non-metallic character to weak metallic character as we move down the group.
Question 10
1 / -0

Which metal has $$2$$ electrons in the outermost orbit

A
$$Na$$

B
$$Cu$$

C
$$Au$$

D
$$Be$$

Solution

Be has two electrons in outermost orbit. Electronic configuration of Be is $$1s^{2} 2s^{2}$$.

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Classification of Elements and Periodicity in Properties Test - 57

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Classification of Elements and Periodicity in Properties Test - 57

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Question 1

$$1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2$$

$$1s^2 2s^2 2p^6 3s^2 3p^6$$

$$1s^2 2s^2 2p^6 3p^6$$

$$1s^2 2s^2 2p^6 3s^2$$

Solution

Question 2

$$N, O$$

$$Na, Ca$$

$$As, Bi$$

$$Pb, Sb$$

Solution

Question 3

Chlorine

Nitrogen

Oxygen

Boron

Solution

Question 4

Energy absorbed when an electron is added to an isolated atom in the gaseous state

Energy released when an electron is added to an isolated atom in the gaseous state

Energy required to take out an electron from an isolated gaseous state

Power of an atom to attract an electron to itself

Solution

Question 5

Very high

Very low

Nearly same

Exactly same

Solution

Question 6

Electron affinity decrease along a period

Electron affinity generally increase along a period

Nitrogen atom has half-filled $$p-$$orbital.

Nitrogen is $$p-$$block element.

Solution

Question 7

$$s-$$ block element

$$p-$$ block element

$$d-$$ block element

Inert gas

Solution

Question 8

Mendeleev

Dalton

Avogadro

Cavendish

Solution

Question 9

Strong metallic

Weak metallic

Strong non-metallic

Weak non-metallic

Solution

Question 10

$$Na$$

$$Cu$$

$$Au$$

$$Be$$

Solution

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