The p-Block Elements Test

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The p-Block Elements Test - 14

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Weekly Quiz Competition

Question 1
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Which element has the highest valency with respect to oxygen?

A
Sodium

B
Aluminium

C
Chlorine

D
Sulphur

Solution

The valence of an element with respect to oxygen is twice the number of oxygen atoms with which one atom of that element chemically combines.

The valency of chlorine with respect to oxygen is 7.
Question 2
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Which of the following is representative group of elements in the periodic table?

A
Lanthanum

B
Argon

C
Chromium

D
Aluminium

Solution

The elements present in s and p block elements except noble gases are known as representative elements .

A) Lanthanum is in d block
B) Argon is a noble gas
C) Chromium is a d block element
D) Aluminium is a p block element

Thus, aluminium is a representative element.

Hence, option D is correct.
Question 3
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The monomer units of silicons, a water repellant, acid resistant and heat resistant polymer, is:

A
$$Si$$

B
$$SiO_{2}$$

C
$$R_{2}Si(OH)_2$$

D
$$RSiOH$$

Solution

Alkyl group is water repellent and acid as well as heat resistant because of high bond energy.

Hence, the monomer units of silicones as water repellant, acid-resistant and heat resistant polymer is $$R_2Si(OH)_2$$.

Therefore, option C is correct.
Question 4
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Which element show more pronounced inert pair effect?

A
N

B
Sn

C
C

D
Pb

Solution

Inert pair effect is the reluctance of the outermost s-electrons to participate in bonding. This effect increases down the group.
Question 5
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Non-metals present in borax are:

A
$$B$$

B
$$O$$

C
both $$O$$ and $$B$$

D
$$Na$$

Solution

Borax is sodium tetraborate or sodium borate. Its formula is $$Na_2B_4O_7\cdot 10H_2O$$. It contains $$O$$ and $$B$$ non metals.
Question 6
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Silicon is an important constituent of:

A
chlorophyll

B
haemoglobin

C
rocks

D
amalgams

Solution

Chlorophyll has magnesium as an important metal, haemoglobin has iron as its important constituent, amalgams are mixtures of something with mercury. Note that, silicon is the most abundant element in earth's crust.
Question 7
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The element whose atomic volume is least is

A
Boron

B
Aluminum

C
Gallium

D
Thallium
Solution
In moving from left to right in a period the atomic volume first decreases and then incrases because-
- As we move left to right in a period , one electron and one proton gets added .
- Initially , the increase in nuclear charge overcomes the increase in the no. of electrons. Hence the atomic volume decreases.
- But in the right of the priodic table newly added electrons goes into the p orbital and due to high shielding power of s and p orbitals , atomic volume increase.
Atomic volume of Boron is least
Question 8
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The least abundant element of IV A group is :

A
C

B
Si

C
Ge

D
Pb

Solution

The least abundant element of IV A group is Ge.
The decreasing order of abundance is $$Si > C > Sn > Pb > Ge$$
Question 9
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If the valency shell electronic structure for an element is $$ns^{2} np^5$$, this element will belong to the group of:

A
alkali metals

B
inert metals

C
noble gases

D
halogens

Solution

The valence shell or orbital electronic configuration of halogens(17th group elements) is $$ns^2\ np^5$$.

Hence, the correct option is $$\text{D}$$
Question 10
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Which of the following elements has a limited co-ordination number of four?

A
$$Sn$$

B
$$C$$

C
$$Si$$

D
$$Ge$$

Solution

Tin, silicon and germanium can extend their valency owing to the empty d orbitals present in their configuration. However, Carbon cannot do so.

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The p-Block Elements Test - 14

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The p-Block Elements Test - 14

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Question 1

Sodium

Aluminium

Chlorine

Sulphur

Solution

Question 2

Lanthanum

Argon

Chromium

Aluminium

Solution

Question 3

$$Si$$

$$SiO_{2}$$

$$R_{2}Si(OH)_2$$

$$RSiOH$$

Solution

Question 4

N

Sn

C

Pb

Solution

Question 5

$$B$$

$$O$$

both $$O$$ and $$B$$

$$Na$$

Solution

Question 6

chlorophyll

haemoglobin

rocks

amalgams

Solution

Question 7

Boron

Aluminum

Gallium

Thallium

Solution

Question 8

C

Si

Ge

Pb

Solution

Question 9

alkali metals

inert metals

noble gases

halogens

Solution

Question 10

$$Sn$$

$$C$$

$$Si$$

$$Ge$$

Solution

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