The p-Block Elements Test

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The p-Block Elements Test - 73

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Weekly Quiz Competition

Question 1
1 / -0

$$2RCl+Si\xrightarrow [ 570\ K ]{ Cu\ powder } { R }_{ 2 }{ SiCl }_{ 2 }\xrightarrow [ ]{ { H }_{ 2 }O } { R }_{ 2 }Si{ (OH) }_{ 2 }\xrightarrow [ ]{ Polymerisation } $$ $$(A). (A)$$ is:

A
cyclic silicone

B
cross linked silicone

C
linear silicone

D
none of these

Solution
Question 2
1 / -0

Which one of the following is the correct statement?

A
$$B_2H_6 \cdot 2NH_3$$ is known as 'inorganic benzene'

B
Boric acid is a protonic acid

C
Beryllium exhibits coordination number of six

D
Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase

Solution

The correct option is (D).
Explanation:
A) $B_{2} H_{6} \cdot 2 N H_{3}$ is known as "inorganic benzene".
Incorrect" inorganic benzene" is ( $B_{3} N_{3} H_{6}$ ) which is also called Borazole.
B) Boric acid is a proton donor acid.
Incorrect :A chemical compound which release H+ ion when it reacts with water is called protic acid.Boric acid is not a protic acid.
C) Beryllium exhibits coordination number of six.
Incorrect: becuase Be do not have vacant d-orbitals to form a coordination number 6.
D) Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase or gas phase.
correct.Be forms the solid $B e C l_{2}$ which is a 1-dimensional polymer consisting of edge-shared tetrahedral. Al forms $A l C l_{3}$ dimers.
Question 3
1 / -0

Xenon hexafluoride reacts with silica to form a xenon compound X. The oxidation state of Xe in X is :

A
+2

B
+4

C
+6

D
0

Solution

$$SiO_2 + 2XeF_6 \rightarrow 2XeOF_4 + SiF_4$$

Oxidation state of Xe in (X) is +6.

Option C is correct.
Question 4
1 / -0

$${Na}_{2}{B}_{4}{O}_{7}\cdot{10H}_{2}O$$ is correctly represented as:

A
$${2NaBO}_{2}\cdot{Na}_{2}{B}_{2}{O}_{3}\cdot{10H}_{2}O$$

B
$${Na}_{2}\left[{B}_{4}{O}_{5}\left(OH\right)_{4}\right]\cdot{8H}_{2}O$$

C
$${Na}_{2}\left[{B}_{4}\left(H_{2}O\right)_{4}\right){O}_{7}]\cdot{6H}_{2}O$$

D
all of the above

Solution
Question 5
1 / -0

Bauxite ore is generally contaminated with impurity of oxides of two elements $${E}_{1}$$ and $${E}_{2}$$. Which of the following statements is correct?

A
$${E}_{1}$$ is a non-metal and belongs to 3rd period while $${E}_{2}$$ is a metal and belong to fourth period

B
One of the two oxides has three dimensional polymeric structure.

C
Both (A) and (B) are correct

D
None of the above

Solution
Question 6
1 / -0

Which of the following elements of matter would best convey that there is life on earth

A
Oxygen

B
Hydrogen

C
Carbon

D
Iron

Solution

$$\text{Life on Earth is based on carbon,}$$ likely because each carbon atom can form bonds with up to four other atoms simultaneously. This quality makes carbon well-suited to form the long chains of molecules that serve as the basis for life as we know it, such as proteins and DNA.
Question 7
1 / -0

The decrease stability of higher oxidation state in p-block with increasing atomic number is due to

A
Increase in bond energy as going down the group

B
Inert pair effect.

C
Both (A) and (B)

D
None is correct

Solution

The inert pair effect is the tendency of the electrons in the outermost atomic s orbital to remain unionized or unshared in compounds of post-transition metals. Down the group in the p-block, the inert pair effect becomes more pronounced on account of enhanced increase in effective nuclear charge. Therefore, due to reluctance of electrons of s-subshell to participate in chemical bonding, there occurs a decrease in stability of higher oxidation states in p-block with increasing atomic number.

Hence, option B is correct.
Question 8
1 / -0

On the addition of mineral acid to an aqueous solution of borax, the compound formed is

A
Boro dihydride

B
Orthoboric acid

C
Metaboric acid

D
Pyroboric acid

Solution

Addition of mineral acid to an aqueous solution of Borax, orthoboric acid is formed.

$$ Na_{2}B_{4}O_{7} + 2HCl + 5H_{2}O \rightarrow 4H_{3}BO_{3} + 2NaCl $$

Hence, the correct answer is option B.
Question 9
1 / -0

Which element froms maximum compound in chemistry?

A
O

B
H

C
Si

D
C

Solution

Carbon is the element which forms the highest number of compounds especially organic compounds due to its catenation (long chain formation) ability. Carbon, with 4 valence atoms and by virtue of being small in size is most suited to form the highest number of compounds.
Question 10
1 / -0

Carbon has zero oxidation number in________

A
$$CO$$

B
$${CH}_{4}$$

C
$${CH}_{2}{Cl}_{2}$$

D
$${CH}_{3}Cl$$

Solution

$$x+2\times (+1)+2(-1)=0;x=0$$ in $${CH}_{2}{Cl}_{2}$$

Option C is correct.

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 73

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The p-Block Elements Test - 73

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SHARING IS CARING

Question 1

cyclic silicone

cross linked silicone

linear silicone

none of these

Solution

Question 2

$$B_2H_6 \cdot 2NH_3$$ is known as 'inorganic benzene'

Boric acid is a protonic acid

Beryllium exhibits coordination number of six

Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase

Solution

Question 3

+2

+4

+6

0

Solution

Question 4

$${2NaBO}_{2}\cdot{Na}_{2}{B}_{2}{O}_{3}\cdot{10H}_{2}O$$

$${Na}_{2}\left[{B}_{4}{O}_{5}\left(OH\right)_{4}\right]\cdot{8H}_{2}O$$

$${Na}_{2}\left[{B}_{4}\left(H_{2}O\right)_{4}\right){O}_{7}]\cdot{6H}_{2}O$$

all of the above

Solution

Question 5

$${E}_{1}$$ is a non-metal and belongs to 3rd period while $${E}_{2}$$ is a metal and belong to fourth period

One of the two oxides has three dimensional polymeric structure.

Both (A) and (B) are correct

None of the above

Solution

Question 6

Oxygen

Hydrogen

Carbon

Iron

Solution

Question 7

Increase in bond energy as going down the group

Inert pair effect.

Both (A) and (B)

None is correct

Solution

Question 8

Boro dihydride

Orthoboric acid

Metaboric acid

Pyroboric acid

Solution

Question 9

O

H

Si

C

Solution

Question 10

$$CO$$

$${CH}_{4}$$

$${CH}_{2}{Cl}_{2}$$

$${CH}_{3}Cl$$

Solution

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