The s-Block Elements Test 38

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The s-Block Elements Test 38

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Weekly Quiz Competition

Question 1
1 / -0

Which of the given halide does not conduct electricity in fused state and in solutions?

A
$$BeCl_2$$

B
$$MgCl_2$$

C
$$CaCl_2$$

D
none of these

Solution

$$Be{ Cl }_{ 2 }$$ cannot conduct electricity in fused state because charged particles cannot move within the crystal.
Question 2
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Which of the following statement is true regarding alkaline earth metals?

A
Beryllium and barium compounds are poisonous in nature

B
Beryllium shows diagonal relationship with aluminium

C
Beryllium salts impart yellow colour to flame

D
Both $$A$$ and $$B$$

Solution

Due to comparatively same size as aluminium, Beryllium show diagonal relationship with aluminium. Same charge/size ratio.
Due to the high reactivity of metals, water-soluble compounds of $$Be$$ and $$Ba$$ are poisonous. So option $$D$$ is correct.
Question 3
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The thermal stability of alkaline earth metal carbonates- $$MgCO_3, CaCO_3, SrCO_3$$ and $$BaCO_3$$, follows the order:

A
$$BaCO_3 > SrCO_3 > CaCO_3 > MgCO_3$$

B
$$CaCO_3 > SrCO_3 > MgCO_3 > BaCO_3$$

C
$$MgCO_3 > CaCO_3 > SrCO_3 > BaCO_3$$

D
$$BaCO_3 > SrCO_3 > MgCO_3 > CaCO_3$$

Solution

As we move down the group alkaline earth metal carbonates require more heating to decompose, so carbonates become more thermally stable down the group.
Question 4
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Which of the following is the correct order of stability for the given superoxides?

A
$$KO_{2} < RbO_{2} < CsO_{2}$$

B
$$CsO_{2} < RbO_{2} < KO_{2}$$

C
$$RbO_{2} < CsO_{2} < KO_{2}$$

D
$$KO_{2} < CsO_{2} < RbO_{2}$$

Solution

With the progressive increase in the size of alkali metal ions, the stability of superoxides increases because the size of superoxide ion is large and large cation can be stabilised more by large anion.

Therefore, the order of stability is : $$KO_{2} < RbO_{2} < CsO_{2}$$.
Question 5
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Elements showing diagonal relationship are:

A
$$Li$$ and $$Be$$

B
$$Li$$ and $$Mg$$

C
$$Li$$ and $$Na$$

D
$$Al$$ and $$Si$$

Solution

Elements showing diagonal relationship are $$Li$$ and $$Mg$$. This diagonal relationship is due to similarity in ionic sizes and charge/ radius ratio of elements. Polarizing power of ions of $$Li^+$$ and $$Mg^{2+}$$ and electronegativity of $$Li$$ and $$Mg$$ are similar.
Question 6
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Both lithium and magnesium display similar properties due to the diagonal relationship; however, the one which is incorrect, is:

A
both form nitrides

B
nitrates of both $$Li$$ and $$Mg$$ yield $$NO_{2}$$ and $$O_{2}$$ on heating

C
both from basic carbonates

D
both form soluble bicarbonates
Question 7
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Select the incorrect choice:

A
The solubility of alkaline earth metal carbonates, sulfates, and chromates increases from $$Be$$ to $$Ba$$.

B
The solubility of alkaline earth metal hydroxides is less than that of alkali metal hydroxides.

C
Solubility of alkaline earth metal oxides increases from $$Be$$ to $$Ba$$.

D
$$SO_2$$ on passing in lime water turns it milky.
Question 8
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Consider the metals $$B, Al, Mg$$ and $$K$$. What will be the correct order of their metallic character?

A
$$K> Mg> Al> B$$

B
$$Al> Mg> B> K$$

C
$$B> Al> Mg> K$$

D
$$Mg> Al> K> B$$
Question 9
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$$LiOH$$ reacts with $$CO_{2}$$ to form $$Li_{2}CO_{3}$$ (atomic mass of $$Li = 7)$$. The amount of $$CO_{2}$$ (in g) consumed by $$1\ g$$ of $$LiOH$$ is closest to _______.

A
$$0.916$$

B
$$1.832$$

C
$$0.544$$

D
$$1.088$$

Solution

Balanced chemical equation is:
$$2LiOH+C{ O }_{ 2 }\rightarrow { Li }_{ 2 }C{ O }_{ 3 }+{ H }_{ 2 }O$$
Molecular weight of each specie is:
$$LiOH$$=24 g/mol; $$C{ O }_{ 2 }$$=44 g/mol; $${ Li }_{ 2 }C{ O }_{ 3 }$$= 74 g/mol; $${ H }_{ 2 }O$$=18 g/mol
From the reaction:
2 mol of $$LiOH$$ ($$24\times2=48\ g$$) consumes 1 mol of $$CO_2$$ (44 g)
Therefore, 1 g of $$LiOH$$ will consume $$\frac { 1 }{ 48 } \times 44\quad g\quad C{ O }_{ 2 }=0.916\ g\ CO_2$$
Option A is the correct answer.
Question 10
1 / -0

The most abundant metal ion present in the human body is

A
$$Zn^{2+}$$

B
$$Ca^{2+}$$

C
$$Na^+$$

D
$$Fe^{2+}$$

Solution

Most abundant metal ion in human body is $$Ca^{2+}$$.

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The s-Block Elements Test 38

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The s-Block Elements Test 38

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SHARING IS CARING

Question 1

$$BeCl_2$$

$$MgCl_2$$

$$CaCl_2$$

none of these

Solution

Question 2

Beryllium and barium compounds are poisonous in nature

Beryllium shows diagonal relationship with aluminium

Beryllium salts impart yellow colour to flame

Both $$A$$ and $$B$$

Solution

Question 3

$$BaCO_3 > SrCO_3 > CaCO_3 > MgCO_3$$

$$CaCO_3 > SrCO_3 > MgCO_3 > BaCO_3$$

$$MgCO_3 > CaCO_3 > SrCO_3 > BaCO_3$$

$$BaCO_3 > SrCO_3 > MgCO_3 > CaCO_3$$

Solution

Question 4

$$KO_{2} < RbO_{2} < CsO_{2}$$

$$CsO_{2} < RbO_{2} < KO_{2}$$

$$RbO_{2} < CsO_{2} < KO_{2}$$

$$KO_{2} < CsO_{2} < RbO_{2}$$

Solution

Question 5

$$Li$$ and $$Be$$

$$Li$$ and $$Mg$$

$$Li$$ and $$Na$$

$$Al$$ and $$Si$$

Solution

Question 6

both form nitrides

nitrates of both $$Li$$ and $$Mg$$ yield $$NO_{2}$$ and $$O_{2}$$ on heating

both from basic carbonates

both form soluble bicarbonates

Question 7

The solubility of alkaline earth metal carbonates, sulfates, and chromates increases from $$Be$$ to $$Ba$$.

The solubility of alkaline earth metal hydroxides is less than that of alkali metal hydroxides.

Solubility of alkaline earth metal oxides increases from $$Be$$ to $$Ba$$.

$$SO_2$$ on passing in lime water turns it milky.

Question 8

$$K> Mg> Al> B$$

$$Al> Mg> B> K$$

$$B> Al> Mg> K$$

$$Mg> Al> K> B$$

Question 9

$$0.916$$

$$1.832$$

$$0.544$$

$$1.088$$

Solution

Question 10

$$Zn^{2+}$$

$$Ca^{2+}$$

$$Na^+$$

$$Fe^{2+}$$

Solution

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