Periodic Properties Test

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Periodic Properties Test - 1

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Weekly Quiz Competition

Question 1
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Without looking at the periodic table, select the elements of IIIA group of the periodic table (Atomic numbers are given)

A
3, 11, 19, 37

B
5, 13, 21, 39

C
7, 15, 31, 49

D
5,13, 31, 49

Solution

5      = 1s2, 2s2 2P1

13      = 1s2, 2s2 2P6, 3s2, 3P1

31      = 1s2, 2s2 2P6, 3s2, 3P6, 4s2, 3d10, 4P1

49      = 1s2, 2s2 2P6, 3s2, 3P6, 4s2, 3d10, 4P6, 5s2, 4d10, 5P1

Because in all above configurations only one shell (outermost) is incomplete and last electron enters to the ‘P’ sub shells; hence these are ‘P’ block elements. Also in outermost orbit only three electrons are present hence all these are IIIA group elements.
Question 2
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The order in which the following oxides are arranged according to decreasing basic nature is

A
P₂O₅, Na₂O, MgO, Al₂O₃

B
Al₂O₃, MgO, P₂O₅, Na₂O

C
MgO, Al₂O₃, P₂O₅, Na₂O

D
Na₂O, MgO, Al₂O₃, P₂O₅

Solution

As we move from left to right in a period, basic character decreases.
Question 3
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In going from left to right in a period

A
the basic nature of the oxides increases

B
acidic nature decreases

C
the acidic nature of the oxides decreases

D
no gradation in the nature of oxides is observed

Solution

Acidic nature increases, as we move from left to right in a period.
Question 4
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The electronic configuration of element A is 1s², 2s² 2p⁶, 3s² while of the element B is 1s², 2s² 2p⁵. The formula of the compound containing A and B will be

A
AB

B
A₂B

C
AB₂

D
A₂B₆

Solution

‘A’ after loosing 2 e’s becomes A⁺⁺, while B after gaining e¯ becomes B¯ hence the compound will be AB₂
Question 5
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Amongst LiCl, BeCl₂, MgCl₂ and RbCl the compounds with greatest and least ionic character, respectively are

A
LiCl and RbCl

B
RbCl and BeCl₂

C
RbCl and MgCl₂

D
MgCl₂ and BeCl₂

Solution

Due small size Be⁺⁺ forms covalent, while due greater size Rb⁺ forms ionic compounds. This is according to fajan’s Rule.

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Periodic Properties Test - 1

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Question 1

3, 11, 19, 37

5, 13, 21, 39

7, 15, 31, 49

5,13, 31, 49

Solution

Question 2

P2O5, Na2O, MgO, Al2O3

Al2O3, MgO, P2O5, Na2O

MgO, Al2O3, P2O5, Na2O

Na2O, MgO, Al2O3, P2O5

Solution

Question 3

the basic nature of the oxides increases

acidic nature decreases

the acidic nature of the oxides decreases

no gradation in the nature of oxides is observed

Solution

Question 4

AB

A2B

AB2

A2B6

Solution

Question 5

LiCl and RbCl

RbCl and BeCl­2

RbCl and MgCl2

MgCl2 and BeCl­2

Solution

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P₂O₅, Na₂O, MgO, Al₂O₃

Al₂O₃, MgO, P₂O₅, Na₂O

MgO, Al₂O₃, P₂O₅, Na₂O

Na₂O, MgO, Al₂O₃, P₂O₅

A₂B

AB₂

A₂B₆

RbCl and BeCl₂

RbCl and MgCl₂

MgCl₂ and BeCl₂