The s-Block Elements Test 30

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The s-Block Elements Test 30

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Weekly Quiz Competition

Question 1
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Cause of diagonal relationship is

A
Similar electronic configuration of the elements

B
Similar $$e/r$$ ratio of the elements

C
Similar number of valency electrons in the elements

D
Same atomic weights of the electrons

Solution

Diagonal resemblance is due to similar charge to size ratio (i.e. $$e/r\ ratio$$).
Question 2
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Which of the following alkali metals is smallest in size?

A
$$Rb$$

B
$$K$$

C
$$Na$$

D
$$Li$$

Solution

$$Li$$ is smallest in size among the alkali metals as it has minimum number of shells.
Question 3
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Alkali metals lose electrons in

A
$$ s-$$ orbitals

B
$$ p-$$ orbitals

C
$$ d-$$ orbitals

D
$$ f-$$ orbitals

Solution

Alkali metals lose electrons in $$ s-$$ orbital because their valence electrons are present in $$ s-$$ orbitals.
Question 4
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Electronegative beryllium is approximately equal to that of

A
Aluminium

B
Boron

C
Magnesium

D
Sodium

Solution

Element - $$Be\ \ \ \ Al$$
Electronegative - $$1.5\ \ \ \ 1.5$$

Be has a diagonal relationship with Al.
Question 5
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Which of the following statement is correct regarding alkali metals?

A
Cation is less stable than the atom

B
Cation is smaller than the atom

C
Size of cation and atom is the same

D
Cation is greater in size than the atom

Solution

After removal of an electron the effective nuclear charge per electron increases hence the size decreases.
Question 6
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The most electropositive amongst the alkaline earth metal is

A
Beryllium

B
Magnesium

C
Calcium

D
Barium

Solution

As we go down group electropositive character increases because $$I.E.$$ decreases.

$$Ba$$ is the most electropositive element in the group.
Question 7
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Which alkali metal is most metallic in character?

A
$$K$$

B
$$Cs$$

C
$$Na$$

D
$$Li$$

Solution

$$Cs > Rb > K > Na > Li$$ -- Metallic character decreasing order.

Note: Down the group metallic character increases.
Question 8
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Beryllium differs from rest of the members of its family (Group $$IIA$$) in many ways. The reason for this is its

A
Small size and higher electronegativity

B
Small size and lower electronegativity

C
Large size and lower ionisation energy

D
Large size and larger ionic radius

Solution

Beryllium differs from the rest of the members of its family (Group $$IIA$$) in many ways. The reason for this is due to its:
(i) small atomic size.
(ii) high electronegativity.
(iii) absence of $$d$$ orbitals.
Question 9
1 / -0

$$Li$$ shows the diagonal relationship with

A
$$Mg$$

B
$$B$$

C
$$Al$$

D
$$C$$

Solution

Elements of $$2^{nd}$$ period often show resemblance to the element of the $$3^{rd}$$ period diagonaly placed to it. This type of behaviour is called as digonal relationship. $$Li$$ shows the diagonal relationship with $$Mg$$.
Question 10
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Which of the following is a false statement?

A
Fluorine is more electronegative than chlorine

B
Nitrogen has greater $$IE_1$$ than oxygen

C
Lithium is amphoteric

D
Chlorine is an oxidising agent

Solution

Lithium is basic in nature and hence it is not amphoteric. All the other statements are correct.

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The s-Block Elements Test 30

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The s-Block Elements Test 30

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Question 1

Similar electronic configuration of the elements

Similar $$e/r$$ ratio of the elements

Similar number of valency electrons in the elements

Same atomic weights of the electrons

Solution

Question 2

$$Rb$$

$$K$$

$$Na$$

$$Li$$

Solution

Question 3

$$ s-$$ orbitals

$$ p-$$ orbitals

$$ d-$$ orbitals

$$ f-$$ orbitals

Solution

Question 4

Aluminium

Boron

Magnesium

Sodium

Solution

Question 5

Cation is less stable than the atom

Cation is smaller than the atom

Size of cation and atom is the same

Cation is greater in size than the atom

Solution

Question 6

Beryllium

Magnesium

Calcium

Barium

Solution

Question 7

$$K$$

$$Cs$$

$$Na$$

$$Li$$

Solution

Question 8

Small size and higher electronegativity

Small size and lower electronegativity

Large size and lower ionisation energy

Large size and larger ionic radius

Solution

Question 9

$$Mg$$

$$B$$

$$Al$$

$$C$$

Solution

Question 10

Fluorine is more electronegative than chlorine

Nitrogen has greater $$IE_1$$ than oxygen

Lithium is amphoteric

Chlorine is an oxidising agent

Solution

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