The p-Block Elements Test

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The p-Block Elements Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Electronegativity of inert gases is :

A
low

B
high

C
zero

D
abnormally high

Solution

Electronegativity of inert gases is zero as they have no tendency to attract the shared $$e^{-}$$.

Since the noble gases already have eight electrons in their outer shells, they don't want to attract any more.

Since electronegativity measures the amount of attraction between an atom and an electron, noble gases do not have electronegativity.

Option C is correct.
Question 2
1 / -0

Argon was discovered by :

A
Rayleigh

B
Ramsay

C
Both (A) and (B)

D
Frankland and Lockeyer

Solution

Argon was discovered by Lord Rayleigh and Sir William Ramsay in 1894.

It was isolated by examination of the residue obtained by removing nitrogen, oxygen, carbon dioxide, and water from clean air.

Option C is correct.
Question 3
1 / -0

Which of the following compound cannot be prepared?

A
$$\mathrm{X}\mathrm{e}\mathrm{F}_{2}$$

B
$$\mathrm{X}\mathrm{e}\mathrm{F}_{3}$$

C
$$\mathrm{X}\mathrm{e}\mathrm{F}_{4}$$

D
$$\mathrm{X}\mathrm{e}\mathrm{F}_{6}$$

Solution

Xe has a complete filled 5p configuration. As a result when it undergoes bonding with an odd number (3 or 5) of F atoms it leaves behind one unpaired electron. This causes the molecule to become unstable. As a result $$XeF_3$$ ,$$XeF_5$$ not possible.

Only even no. of fluorides can combine with Xe. Therefore $$XeF_3$$ cannot be formed, Only even bonds can be formed.
Question 4
1 / -0

A degenerate gas is :

A
He

B
$$\mathrm{O}_{2}$$

C
He(ll)

D
$$\mathrm{H}\mathrm{e}_{2}$$

Solution

$$He(II)$$ is a degenerate gas.
A degenerate gas is one where quantum mechanical effects on the electrons dominate the behavior.A degenerate electron gas can permanently withstand the self-gravitation. its energy cannot be radiated away.
Question 5
1 / -0

$$\mathrm{V}\mathrm{A}$$ group elements are known as:

A
halogens

B
normal elements

C
chalcogens

D
pnicogens

Solution

Halogens: VIIA
Chalcogens: VIA
Pnicogens: VA
Question 6
1 / -0

The molecular formula of phosphorous is:

A
$$P_{1}$$

B
$$P_{4}$$

C
$$P_{2}$$

D
$$P_{5}$$

Solution

The molecular formula of phosphorous is $$P_{4}$$.
White phosphorus, in gaseous state and as waxy solid consists of $$P_4$$ tetrahedra.
Question 7
1 / -0

Compounds formed when the noble gases get entrapped in the cavities of crystal lattices of certain organic and inorganic compounds are known as :

A
Interstitial compounds

B
Clathrates

C
Hydrates

D
Picrates

Solution

Clathrates (also known as cage compounds) are compounds of noble gases in which they are trapped within cavities of crystal lattices of certain organic and inorganic substances.

Option B is correct.
Question 8
1 / -0

Which of the following has the highest density?

A
$$Ne$$

B
$$Ar$$

C
$$He$$

D
$$Xe$$

Solution

Hint: Density is the mass per unit volume which increases down the group.
Explanation:
The density of elements increases down the group. So, the density of xenon is the highest. The density of $$Xe$$ is the highest

Final answer: The correct answer is option (D)
Question 9
1 / -0

The colour and state of phosphorus pentoxide is :

A
white crystalline solid

B
white amorphous liquid

C
blue crystalline

D
blue colour liquid

Solution

The colour and state of phosphorus pentoxide is white crystalline solid.
Question 10
1 / -0

Ionic radius (in $$\mathrm{A}^{\mathrm{o}}$$) of $$\mathrm{A}\mathrm{s}^{3+},\mathrm{S}\mathrm{b}^{3+}$$ and $$\mathrm{B}\mathrm{i}^{3+}$$ follow the order :

A
$$\mathrm{S}\mathrm{b}^{3+}>\mathrm{B}\mathrm{i}^{3+}$$

B
$$ \mathrm{S}\mathrm{b}^{3+}>\mathrm{B}\mathrm{i}^{3+}>\mathrm{A}\mathrm{s}^{3+}$$

C
$$ \mathrm{B}\mathrm{i}^{3+}>\mathrm{A}\mathrm{s}^{3+}>\mathrm{S}\mathrm{b}^{3+}$$

D
$$\mathrm{B}\mathrm{i}^{3+}>\mathrm{S}\mathrm{b}^{3+}>\mathrm{A}\mathrm{s}^{3+}$$

Solution

ionic radius is directly proportional to molar mass in a group

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 21

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The p-Block Elements Test - 21

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SHARING IS CARING

Question 1

low

high

zero

abnormally high

Solution

Question 2

Rayleigh

Ramsay

Both (A) and (B)

Frankland and Lockeyer

Solution

Question 3

$$\mathrm{X}\mathrm{e}\mathrm{F}_{2}$$

$$\mathrm{X}\mathrm{e}\mathrm{F}_{3}$$

$$\mathrm{X}\mathrm{e}\mathrm{F}_{4}$$

$$\mathrm{X}\mathrm{e}\mathrm{F}_{6}$$

Solution

Question 4

He

$$\mathrm{O}_{2}$$

He(ll)

$$\mathrm{H}\mathrm{e}_{2}$$

Solution

Question 5

halogens

normal elements

chalcogens

pnicogens

Solution

Question 6

$$P_{1}$$

$$P_{4}$$

$$P_{2}$$

$$P_{5}$$

Solution

Question 7

Interstitial compounds

Clathrates

Hydrates

Picrates

Solution

Question 8

$$Ne$$

$$Ar$$

$$He$$

$$Xe$$

Solution

Question 9

white crystalline solid

white amorphous liquid

blue crystalline

blue colour liquid

Solution

Question 10

$$\mathrm{S}\mathrm{b}^{3+}>\mathrm{B}\mathrm{i}^{3+}$$

$$ \mathrm{S}\mathrm{b}^{3+}>\mathrm{B}\mathrm{i}^{3+}>\mathrm{A}\mathrm{s}^{3+}$$

$$ \mathrm{B}\mathrm{i}^{3+}>\mathrm{A}\mathrm{s}^{3+}>\mathrm{S}\mathrm{b}^{3+}$$

$$\mathrm{B}\mathrm{i}^{3+}>\mathrm{S}\mathrm{b}^{3+}>\mathrm{A}\mathrm{s}^{3+}$$

Solution

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