Classification of Elements and Periodicity in Properties Test

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Classification of Elements and Periodicity in Properties Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

The electronic configuration of gadolinium (Atomic number 64) is

A
[Xe]4f³5d⁵6s²

B
[Xe]4f⁷5d²6s¹

C
[Xe]4f⁸5d⁶6s²

D
[Xe]4f⁷5d¹6s²

Solution

[Xe]4f⁷5d¹6s²
Question 2
1 / -0

Among the alkali metals,Cesium is the most reactive because:

A
it is the heaviest alkali metal

B
it has a single electron in the valence shell

C
its incomplete shell is nearest to the nucleus

D
the outermost electron is very loosely bound than the outermost electron of the other alkali metals

Solution

Cesium has the lowest ionization energy in the alkali metal group beacuse it has the biggest atomic size in the alkali metal family. The valence electron is most loosely held due to its bigger size; and it can easily be lost.
Question 3
1 / -0

The effective distance between the centre of the nucleus of an ion and the point upto which the nucleus has influence on its electron cloud is called ----?

A
covalent radius

B
ionic radius

C
anionic radius

D
cationic radius

Solution

Since ,

' Ionic radius ' is defined as the effective distance from the centre of the nucleus of an ion upto which it has an influence on its electron cloud.

the correct answer is " ionic radius " .

The term Ionic radius is a general term used for both the cations as well as anions .
Question 4
1 / -0

For alkali metals, which one of the following trends is INCORRECT?

A
Density: Li < Na < K < Rb

B
Hydration energy: Li > Na > K > Rb

C
Atomic size: Li < Na < K < Rb

D
Ionization energy: Li > Na > K > Rb

Solution

The expected trend for density is Li < Na < K < Rb but the actual trend is Li < K < Na < Rb. The size of the alkali metal increase down the group but when we move from Na to K, the increase in atomic size is more than expected. It is due to fact that in K valence electron enters 4s orbital but the empty lying 3d orbitals add to its atomic volume.
Question 5
1 / -0

For the four successive transition elements (Cr, Mn, Fe and Co), the stability of + 2 oxidation state will be there in which of the following order? (At. nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

A
Fe > Mn > Co > Cr

B
Mn > Fe > Cr > Co

C
Co > Mn > Fe > Cr

D
Cr > Mn > Co > Fe

Solution

This is attritubuted to the extra stability of half filled orbitals that is seen only in Mn²⁺ (i.e. d⁵). The other members have Fe (d⁶); Cr (d⁴) and Co (d⁷) respectively.
Question 6
1 / -0

Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is ______.

A
Na and Mg

B
N and O

C
Mg and Al

D
Be and B

Solution

The exception in ionization energy is due to extra stability of fully filled and half-filled valence orbitals. It appears in case of N and O where N is half filled; Be and B where B has fully filled; Mg and Al where Mg has fully filled valence orbitals. No such exception appears when we move from Na to Mg.
Question 7
1 / -0

In the periodic table, Nitrogen is placed in group 5b, it ranks which position ?

A
Second

B
Third

C
Fourth

D
First

Solution

Nitrogen is placed in group 5b, it ranks third position .
Question 8
1 / -0

Which of the following is a 'Metalloid'?

A
Antimony

B
Nitrogen

C
Phosphorus

D
Bismuth

Solution

A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them. The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. Antimony is capable of displacing hydrogen from water (like metal), but still most of its chemistry is characteristic of a nonmetal.
Question 9
1 / -0

Metals usually used as catalysts in different reactions belong to

A
f – block

B
p - block

C
d - block

D
s - block

Solution

Transition metals and their compounds function as catalysts either because of their ability to change oxidation state or, in the case of the metals, to adsorb other substances on to their surface and activate them in the process.
Question 10
1 / -0

Mg²⁺ is isoelectronic with

A
Ca²⁺

B
Cu²⁺

C
Zn²⁺

D
Na⁺

Solution

Total electrons in Mg²⁺and Na⁺ are same i.e. 10.

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Classification of Elements and Periodicity in Properties Test - 7

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Classification of Elements and Periodicity in Properties Test - 7

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Question 1

[Xe]4f35d56s2

[Xe]4f75d26s1

[Xe]4f85d66s2

[Xe]4f75d16s2

Solution

Question 2

it is the heaviest alkali metal

it has a single electron in the valence shell

its incomplete shell is nearest to the nucleus

the outermost electron is very loosely bound than the outermost electron of the other alkali metals

Solution

Question 3

covalent radius

ionic radius

anionic radius

cationic radius

Solution

Question 4

Density: Li < Na < K < Rb

Hydration energy: Li > Na > K > Rb

Atomic size: Li < Na < K < Rb

Ionization energy: Li > Na > K > Rb

Solution

Question 5

Fe > Mn > Co > Cr

Mn > Fe > Cr > Co

Co > Mn > Fe > Cr

Cr > Mn > Co > Fe

Solution

Question 6

Na and Mg

N and O

Mg and Al

Be and B

Solution

Question 7

Second

Third

Fourth

First

Solution

Question 8

Antimony

Nitrogen

Phosphorus

Bismuth

Solution

Question 9

f – block

p - block

d - block

s - block

Solution

Question 10

Ca2+

Cu2+

Zn2+

Na+

Solution

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[Xe]4f³5d⁵6s²

[Xe]4f⁷5d²6s¹

[Xe]4f⁸5d⁶6s²

[Xe]4f⁷5d¹6s²

Ca²⁺

Cu²⁺

Zn²⁺

Na⁺