Periodic Properties Test

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Periodic Properties Test - 6

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Weekly Quiz Competition

Question 1
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The following question has four choices out of which ONLY ONE is correct.

Which of the following orders of elements is correct in terms of decreasing ionisation enthalpies?

A
Na > Li > H

B
H > Li > Na

C
Li > H > Na

D
Na > H > Li

Solution

Ionisation energy decreases on moving down a group in the periodic table. This is due to increase in the size of the atoms on moving down the group.
Question 2
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If the valence shell electronic structure of an element is ns²np⁵, then to which group of the periodic table does the element belong?

A
alkali metals

B
halogens

C
alkaline earth metals

D
noble gases

Solution

Since the element has 7 valence electrons, it belongs gropp 17 of the periodic table i.e., the group of halogens.
The general electronic configuration of the group of halogens is ns²np⁵.
Question 3
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The elements with atomic numbers 4, 12, 20, 38 and 56 belong to the group of

A
alkali metals

B
alkaline earth metals

C
halogens

D
noble gases

Solution

All these elements have 2 electrons in their valence shell. Hence, they belong to the alkaline earth metal series.
Question 4
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To which group of the periodic table does the element with electronic configuration 1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹⁰, 4s², 4p⁶, 4d¹⁰, 5s², 5p³ belong?

A
13

B
12

C
15

D
17

Solution

Since each atom of this element contains five valence electrons, it belongs to group 15 of the periodic table.
Also, it has five shells occupied with electrons, hence it is an element of period V.
Question 5
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Iron triad of elements also contains

A
cobalt and nickel

B
manganese and chromium

C
palladium and platinum

D
platinum and iridium

Solution

Iron, nickel and cobalt make up the iron triad. They are called so because all the three have similar properties, even though they are distinct elements.
Question 6
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If we have an element with atomic number 115, then which of the following statements is correct about this element?

A
It will be an s-block element.

B
It will be a p-block element.

C
It will be a d-block element.

D
It will be an actinide.

Solution

The element with atomic number 115 belongs to the 15^th group in the periodic table. Therefore is a p-block element.
Question 7
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Which of the following elements is a metalloid?

A
Si

B
C

C
Bi

D
Sn

Solution

Silicon is classified as a semi-metal or a metalloid because its properties are intermediate between the metals and non-metals.
Question 8
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The screening effect of s-orbital electron is

A
greater than that of p, but lesser than that of d and f electrons

B
lesser than that of p, d and f electrons

C
greater than that of p, d and f electrons

D
equal to that of p, d and f electrons

Solution

An electron in the s-orbital goes spherically around the nucleus, Since it moves closer to the nucleus it offers effective shielding.
Screening effect decreases in the order s > p > d > f.
Question 9
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The electronic configurations of four elements are given as follows:

(1) [Xe] 6s¹
(2) [Xe] 4f¹⁴, 5d¹, 6s²
(3) [Ar] 4s², 4p⁵
(4) [Ar] 3d⁷, 4s²

Which of the following statements about these elements is incorrect?

A
[Xe] 6s¹ is a strong reducing agent.

B
[Xe] 4f¹⁴, 5d¹, 6s² is a d-block element.

C
[Ar] 3d¹⁰, 4s², 4p⁵ has high electron affinity.

D
[Ar] 3d⁷, 4s² shows variable oxidation state.

Solution

[Xe] 4f¹⁴, 5d¹, 6s² is not a d-block element. It is lutetium, and is present in lanthanide series. It is an f-block element.
Hence, statement (2) is incorrect.
All the other statements are correct.
[Xe] 6s¹ is an alkali metal (Cs) which is a strong reducing agent, as it can easily be oxidised by losing one electron.
[Ar], 3d¹⁰, 4s², 4p⁵ is a halogen (Br) and has a high electron affinity.
[Ar] 3d⁷, 4s² is a transition element (Co) and shows a variable oxidation state.

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Periodic Properties Test - 6

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Periodic Properties Test - 6

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Question 1

Na > Li > H

H > Li > Na

Li > H > Na

Na > H > Li

Solution

Question 2

alkali metals

halogens

alkaline earth metals

noble gases

Solution

Question 3

alkali metals

alkaline earth metals

halogens

noble gases

Solution

Question 4

13

12

15

17

Solution

Question 5

cobalt and nickel

manganese and chromium

palladium and platinum

platinum and iridium

Solution

Question 6

It will be an s-block element.

It will be a p-block element.

It will be a d-block element.

It will be an actinide.

Solution

Question 7

Si

C

Bi

Sn

Solution

Question 8

greater than that of p, but lesser than that of d and f electrons

lesser than that of p, d and f electrons

greater than that of p, d and f electrons

equal to that of p, d and f electrons

Solution

Question 9

[Xe] 6s1 is a strong reducing agent.

[Xe] 4f14, 5d1, 6s2 is a d-block element.

[Ar] 3d10, 4s2, 4p5 has high electron affinity.

[Ar] 3d7, 4s2 shows variable oxidation state.

Solution

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[Xe] 6s¹ is a strong reducing agent.

[Xe] 4f¹⁴, 5d¹, 6s² is a d-block element.

[Ar] 3d¹⁰, 4s², 4p⁵ has high electron affinity.

[Ar] 3d⁷, 4s² shows variable oxidation state.