The s-Block Elements Test 29

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The s-Block Elements Test 29

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Weekly Quiz Competition

Question 1
1 / -0

Correct order of polarising power is

A
$$Cs^+ < K^+ < Mg^{2+} < Al^{3+}$$

B
$$K^+ < Cs^+ < Mg^{2+} < Al^{3+}$$

C
$$Cs^+ < K^+ < Al^{3+} < Mg^{2+}$$

D
$$K^+ < Cs^+ < Al^{3+} < Mg^{2+}$$

Solution

According to Fajan's rule polarising power depends on size of cation and charge on cation.More the charge on cation and smaller the size of cation will leads to high polarising power.
so correct order is$$ Cs^{+} < K^{+} < Mg^{2+} < Al^{3+}$$
Question 2
1 / -0

The ionic radii of $$Li^{+}, Na^{+}, K^{+}$$ are in which of the following order

A
$$K^{+} > Na^{+} > Li^{+}$$

B
$$K^{+} > Na^{+} < Li^{+}$$

C
$$K^{+} < Na^{+} < Li^{+}$$

D
$$Li^{+} > Na^{+} < K^{+}$$

Solution

As we move down the group number of shell increases and hence radii increases.
So correct order is $$K^{+} > Na^{+} > Li^{+}$$
Question 3
1 / -0

Arrange the following in increasing order of their atomic radius $$Na, K, Mg, Rb$$

A
$$Mg < K < Na < Rb$$

B
$$Mg < Na < K < Rb$$

C
$$Mg < Na < Rb < K$$

D
$$Na < K < Rb < Mg$$

Solution

Across a period from left to right atomic radius decreases and down the group atomic radius increases.
So correct order is: $$Mg < Na < K < Rb$$
Question 4
1 / -0

Alkali metals in each period have

A
Smallest size

B
Lowest ionization potential

C
Highest ionization potential

D
Highest electronegativity

Solution

Alkali metals have lowest ionization potential in each period.
Question 5
1 / -0

Aluminium is diagonally related to ( in periodic table )

A
$$Li$$

B
$$C$$

C
$$B$$

D
$$Be$$

Solution

Aluminium is diagonally related to beryllium ($$Be$$).
Question 6
1 / -0

Diagonal relationship is shown by

A
Elements of first period

B
Elements of second period

C
Elements of third period

D
(b) and (c) both

Solution

Coorect option is D.
Question 7
1 / -0

Which of the following show diagonal relationship

A
$$B$$ and $$Si$$

B
$$B$$ and $$Al$$

C
$$B$$ and $$Ga$$

D
$$B$$ and $$C$$

Solution

$$B$$ shows diagonal relationship with $$Si$$.
Question 8
1 / -0

In which of the following groups all the three members are of the alkaline earth metals family

A
$$Al_, Sr, Ti$$

B
$$Li, Na, K$$

C
$$Mg, Ba, Ca$$

D
$$Rb, Cs, Fr$$

Solution

$$Mg, Ba$$ and $$Ca$$ belongs to alkaline earth metals family.
Question 9
1 / -0

Lithium shows diagonal relationship with

A
$$Al$$

B
$$Mg$$

C
$$Pb$$

D
$$Hg$$

Solution

Lithium shows diagonal resemblance with aluminium due to similar charge to size ratio.
Question 10
1 / -0

Potassium is kept in

A
Alcohol

B
Water

C
Kerosene

D
Liquid ammonia

Solution

Alkali metals are highly reactive metals. They react with

Alcohol - $$2C_2H_5OH+2K \rightarrow 2C_2H_5OK+H_2$$

Water - $$2K+2H_2O \rightarrow 2KOH+H_2$$

Ammonia - $$K+(x+y)NH_3 \rightarrow \underset {Ammoniated \ cation}{[K(NH_3)_x]^+ }+ \underset {Ammoniated \ electron}{[e(NH_3)_y]^-}$$

But they do not react with kerosene.

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The s-Block Elements Test 29

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Question 1

$$Cs^+ < K^+ < Mg^{2+} < Al^{3+}$$

$$K^+ < Cs^+ < Mg^{2+} < Al^{3+}$$

$$Cs^+ < K^+ < Al^{3+} < Mg^{2+}$$

$$K^+ < Cs^+ < Al^{3+} < Mg^{2+}$$

Solution

Question 2

$$K^{+} > Na^{+} > Li^{+}$$

$$K^{+} > Na^{+} < Li^{+}$$

$$K^{+} < Na^{+} < Li^{+}$$

$$Li^{+} > Na^{+} < K^{+}$$

Solution

Question 3

$$Mg < K < Na < Rb$$

$$Mg < Na < K < Rb$$

$$Mg < Na < Rb < K$$

$$Na < K < Rb < Mg$$

Solution

Question 4

Smallest size

Lowest ionization potential

Highest ionization potential

Highest electronegativity

Solution

Question 5

$$Li$$

$$C$$

$$B$$

$$Be$$

Solution

Question 6

Elements of first period

Elements of second period

Elements of third period

(b) and (c) both

Solution

Question 7

$$B$$ and $$Si$$

$$B$$ and $$Al$$

$$B$$ and $$Ga$$

$$B$$ and $$C$$

Solution

Question 8

$$Al_, Sr, Ti$$

$$Li, Na, K$$

$$Mg, Ba, Ca$$

$$Rb, Cs, Fr$$

Solution

Question 9

$$Al$$

$$Mg$$

$$Pb$$

$$Hg$$

Solution

Question 10

Alcohol

Water

Kerosene

Liquid ammonia

Solution

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