Periodic Properties Test

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Periodic Properties Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Acidity of pentoxides in VA group

A
Decreases

B
Increases

C
Remains same

D
None

Solution

Basic or metallic character of pentaoxides in VA group increases down the group.
Question 2
1 / -0

Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group is due to :

A
reactivity of phosphorus

B
inert nature of nitrogen

C
hydrogen and sulphurous acid

D
large size of phosphorus atom

Solution

Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group is due to large size of phosphorus atom and greater ability to accommodate electrons.
Question 3
1 / -0

Oxidizing action increases in the following order __________.

A
Cl < Br < I < F

B
Cl < I < Br < F

C
I < F < Cl < Br

D
I < Br < Cl < F

Solution

As the size of atom increases oxidizing nature decreases because of decreasing electro-negativity.

So, the correct order of oxidizing ability is I < Br < CI < F
Question 4
1 / -0

An element X which occurs in the first short period has an outer electronic structure s²p¹. What are the formula and acid-base character of its oxides

A
XO₃, basic

B
X₂O₃, basic

C
X₂O₃, amphoteric

D
XO₂, acidic

Solution

B₂O₃, Al₂O₃ are amphoteric oxides.
Question 5
1 / -0

Hydrogen by donating one electron forms H+. In this property, it resembles with

A
Transitional elements

B
Alkaline earth metals

C
Alkali metals

D
Halogens

Solution

Alkali metals have one electron in outermost orbital. They can easily remove an electron to attain noble gas configuration. Hence properties of H⁺ resemble with alkali metal.
Question 6
1 / -0

"The 6 properties of the elements are a periodic function of their atomic numbers.” The statement was given by?

A
N. Bohr

B
J.W. Dobereiner

C
D.I. Mendeleef

D
H.G.J. Moseley

Solution

Moseley's contribution the Periodic Law can be restated:

Similar properties recur periodically when elements are arranged according to increasing atomic number." Atomic numbers, not weights, determine the factor of chemical properties.
Question 7
1 / -0

The properties of Li are similar to those of Mg. This is because:

A
both have nearly the same size.

B
both has their charge to size ratio nearly the same.

C
both have similar electronic configurations.

D
both are found together in nature.
Solution
- The properties of lithium are similar to those of Mg because they are having diagonal relationship.
- The elements having diagonal relationship show similar properties and the reason is because the both of them will have similar electronegativity and polarising power i.e. charge per size ratio of both the elements are nearly the same.
Question 8
1 / -0

Elements after atomic number 103 have not been discovered till now. If an element with atomic number 106 were ever discovered which of the following electronic configuration will it possess.

A
[Rn]5f¹⁴6d4⁷s¹

B
[Rn]5f¹⁴6d⁵7s¹

C
[Rn]5f¹⁴6d⁶7s⁰

D
[Rn]5f¹⁴6d¹7s²7p³

Solution

Rn electronic configuration is 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²⁴p6⁴d105s25p64f145d106s26p6 . Atomic number of Redon is 86.

According to Aufbau Principle extra electrons will be filled in order of7s5f6d7p

so remaining electrons may be filled as 7s²5f¹⁴6d⁴7p⁰

while 7s¹5f¹⁴6d⁵7p⁰ this configuration is more stable because of half-filled d-orbital.

so electronic configuration for 106 atomic number is [Rn]5f¹⁴6d⁵7s¹
Question 9
1 / -0

In the modern periodic table, elements are arranged in

A
Increasing mass

B
Increasing volume

C
Increasing atomic number

D
Alphabetically

Solution

ncreasing atomic number. Mosley found that atomic no. was better fundamental property than atomic weight.
Question 10
1 / -0

Ce (Atomic Number = 58) is a member of:

A
s-block

B
p-block

C
d-block

D
f-block

Solution

Cerium, Ce−58 is a member of f - block.

Electronic configuration of it is: [Xe]4f¹5d¹6s²

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Periodic Properties Test - 14

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Periodic Properties Test - 14

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Question 1

Decreases

Increases

Remains same

None

Solution

Question 2

reactivity of phosphorus

inert nature of nitrogen

hydrogen and sulphurous acid

large size of phosphorus atom

Solution

Question 3

Cl < Br < I < F

Cl < I < Br < F

I < F < Cl < Br

I < Br < Cl < F

Solution

Question 4

XO3, basic

X2O3, basic

X2O3, amphoteric

XO2, acidic

Solution

Question 5

Transitional elements

Alkaline earth metals

Alkali metals

Halogens

Solution

Question 6

N. Bohr

J.W. Dobereiner

D.I. Mendeleef

H.G.J. Moseley

Solution

Question 7

both have nearly the same size.

both has their charge to size ratio nearly the same.

both have similar electronic configurations.

both are found together in nature.

Solution

Question 8

[Rn]5f146d47s1

[Rn]5f146d57s1

[Rn]5f146d67s0

[Rn]5f146d17s27p3

Solution

Question 9

Increasing mass

Increasing volume

Increasing atomic number

Alphabetically

Solution

Question 10

s-block

p-block

d-block

f-block

Solution

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XO₃, basic

X₂O₃, basic

X₂O₃, amphoteric

XO₂, acidic

[Rn]5f¹⁴6d4⁷s¹

[Rn]5f¹⁴6d⁵7s¹

[Rn]5f¹⁴6d⁶7s⁰

[Rn]5f¹⁴6d¹7s²7p³