The s-Block Elements Test 43

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The s-Block Elements Test 43

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Weekly Quiz Competition

Question 1
1 / -0

Which of the alkaline earth elements forms covalent bonds?

A
Ca

B
Mg

C
Sr

D
Be

Solution

An element will form a covalent compound if its electron losing tendency is low, and it does not form an ionic compound by losing electron(s).

Beryllium is the first element in the group $$2$$ of alkaline earth metals. Being the first element of the group, it has a very small atomic size. Due to this, the effective nuclear charge on the valence electrons is high as the nuclear pull is strong, and it becomes difficult for it to lose an electron.

So, beryllium $$(Be)$$ forms a covalent compound by sharing its valence electrons.

Therefore, Option (D) is correct.
Question 2
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Among the following, the incorrect statement is ?

A
$${\text{BaS}}{{\text{O}}_{\text{4}}}$$ is most soluble in $${{\text{H}}_{\text{2}}}{\text{O}}$$ among alkaline earth suphates

B
$${{\text{H}}_{\text{2}}}{{\text{O}}_2}$$ is obtained in better yield by treating $${\text{Ba}}{{\text{O}}_{\text{2}}}$$ with $${{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}$$ rather than with $${{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$$

C
$${\text{Xe}}{{\text{F}}_{\text{6}}}$$ on complete hydrolysis produces $${\text{Xe}}{{\text{O}}_3}$$

D
$${\text{Ni}}{\left( {{\text{CO}}} \right)_{\text{4}}}$$ exists but similar stable complex is not formed by $${\text{Pd}}$$ or $${\text{Pt}}$$

Solution
Question 3
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The correct order of reducing character of alkali metal is:

A
Rb < K < Na < Li

B
Li < Na < K < Rb

C
Na < K < Rb < Li

D
Rb < Na < K < Li
Question 4
1 / -0

The nitride ion in lithium nitride is composed of:

A
7 protons + 10 electrons

B
10 protons + 10 electrons

C
7 protons + 7 protons

D
10 protons + 7 electrons
Question 5
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In aqueous solution the largest ion is:

A
$$Na (aq)$$

B
$$Cs (aq)$$

C
$$Rb (aq)$$

D
$$Li (aq)$$

Solution
Question 6
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Sodium metal is soft but iron is a hard metal. this difference arise due to_________

A
sodium has lesser atomic mass than iron

B
sodium has only one valence electron where as iron has more

C
there is one unpaired electron in sodium but four unpaired electron in iron

D
sodium react readily with air and moisture but iron is resistant to action of water
Question 7
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Identify the element based on the statement given below:
Soft metal stored under kerosene oil

A
Sodium

B
Carbon

C
Beryllium

D
Sulphur

Solution

Carbon, beryllium, and sulphur are not stored under kerosene. Sodium is stored in kerosene because it is a highly reactive metal. If kept in an open container, it will react with oxygen and water vapour present in the atmosphere producing sodium oxide and sodium hydroxide respectively which is a highly exothermic reaction. Hence the correct option is A.
Question 8
1 / -0

Which of the following element have maximum tendency to form complex compound_______.

A
Be

B
Ba

C
Ca

D
Mg
Question 9
1 / -0

Correct order of density is:-

A
Li > Na

B
K > Na

C
Mg > Ca

D
Cs < Rb
Question 10
1 / -0

At infinite dilution whose conductivity is maximum ?

A
$${ K }^{ + }$$

B
$${ Li }^{ + }$$

C
$$Cs^{ + }$$

D
$$Na^{ + }$$

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The s-Block Elements Test 43

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The s-Block Elements Test 43

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SHARING IS CARING

Question 1

Ca

Mg

Sr

Be

Solution

Question 2

$${\text{BaS}}{{\text{O}}_{\text{4}}}$$ is most soluble in $${{\text{H}}_{\text{2}}}{\text{O}}$$ among alkaline earth suphates

$${{\text{H}}_{\text{2}}}{{\text{O}}_2}$$ is obtained in better yield by treating $${\text{Ba}}{{\text{O}}_{\text{2}}}$$ with $${{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}$$ rather than with $${{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$$

$${\text{Xe}}{{\text{F}}_{\text{6}}}$$ on complete hydrolysis produces $${\text{Xe}}{{\text{O}}_3}$$

$${\text{Ni}}{\left( {{\text{CO}}} \right)_{\text{4}}}$$ exists but similar stable complex is not formed by $${\text{Pd}}$$ or $${\text{Pt}}$$

Solution

Question 3

Rb < K < Na < Li

Li < Na < K < Rb

Na < K < Rb < Li

Rb < Na < K < Li

Question 4

7 protons + 10 electrons

10 protons + 10 electrons

7 protons + 7 protons

10 protons + 7 electrons

Question 5

$$Na (aq)$$

$$Cs (aq)$$

$$Rb (aq)$$

$$Li (aq)$$

Solution

Question 6

sodium has lesser atomic mass than iron

sodium has only one valence electron where as iron has more

there is one unpaired electron in sodium but four unpaired electron in iron

sodium react readily with air and moisture but iron is resistant to action of water

Question 7

Sodium

Carbon

Beryllium

Sulphur

Solution

Question 8

Be

Ba

Ca

Mg

Question 9

Li > Na

K > Na

Mg > Ca

Cs < Rb

Question 10

$${ K }^{ + }$$

$${ Li }^{ + }$$

$$Cs^{ + }$$

$$Na^{ + }$$

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