The p-Block Elements Test

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The p-Block Elements Test - 70

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Weekly Quiz Competition

Question 1
1 / -0

Boron when heated with carbon powder at high-temperature forms

A
$$BC_2$$

B
$$B_4C_3$$

C
$$B_2C_3$$

D
$$B_4C$$
Question 2
1 / -0

Total number of sigma bonds formed by all the boron atoms in borax is

A
14

B
4

C
9

D
7
Question 3
1 / -0

Stability of hydrides of carbon family is in order

A
$${\text{C}}{{\text{H}}_{\text{4}}}{\text{ > Si}}{{\text{H}}_{\text{4}}}{\text{ > Ge}}{{\text{H}}_{\text{4}}}{\text{ > Sn}}{{\text{H}}_{\text{4}}}{\text{ > Pb}}{{\text{H}}_{\text{4}}}$$

B
$${\text{C}}{{\text{H}}_{\text{4}}}{\text{ < Si}}{{\text{H}}_{\text{4}}}{\text{ < Ge}}{{\text{H}}_{\text{4}}}{\text{ < Sn}}{{\text{H}}_{\text{4}}}{\text{ < Pb}}{{\text{H}}_{\text{4}}}$$

C
$${\text{C}}{{\text{H}}_{\text{4}}}{\text{ > Sn}}{{\text{H}}_{\text{4}}}{\text{ > Ge}}{{\text{H}}_{\text{4}}}{\text{ > Si}}{{\text{H}}_{\text{4}}}{\text{ > Pb}}{{\text{H}}_{\text{4}}}$$

D
None of these

Solution
Question 4
1 / -0

The number of $$OH$$ units directly linked to boron atoms in $$Na_{2}B_{4}O_{7}.10H_{2}O$$ is:

A
2

B
3

C
4

D
10

Solution
Question 5
1 / -0

Choose the wrong statement:

A
$$Ge, Sn$$ and $$Pb$$ from $$+2$$ as well as $$+4$$ oxidation state

B
$$Ge^{2+}$$ and $$Sn^{2+}$$ compounds act as reducing agents

C
$$Pb^{4+}$$ compounds act as oxidizing agents

D
Stability increases from $$Ge^{2+}$$ to $$Pb^{2+}$$
Question 6
1 / -0

Aluminium exist in +3 state where as thallium exist in both +1 & +3 oxidation state. Reason for this is

A
inert pair effect

B
Lanthanoid contraction

C
Diagonal relationship

D
none of these
Question 7
1 / -0

Borax on heating strongly above its melting point melts to a liquid, which then solidifies to a transparent mass commonly known as borax-bead. The transparent glassy mass consists of:

A
Sodium pyroborate

B
Boric anhydride

C
Sodium meta-berate

D
Boric anhydride and sodium metaborate

Solution

Borax ($$ Na_{2}B_{4}O_{7}.10H_{2}O $$) when dissolved in water forms orthoboric acid and an alkaline solution. On heating strongly above its melting point, borax first looses its water and melts to a liquid, which then solidifies to a transparent mass, commonly known as borax-bead. This borax-bead is made of boric anhydride and sodium metaborate.

$$ Na_{2}B_{4}O_{7}.10H_{2}O \overset{Heat}{\rightarrow} B_{4}O_{7} \overset{Heat}{\rightarrow} 2NaBO_{2} + B_{2}O_{3} $$

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

The solution of borax in water is:

A
Neutral

B
Acidic

C
Alkaline

D
Amphoteric

Solution
Question 9
1 / -0

Which of the following does not exist ?

A
$$BiCl_{5 }$$

B
Xe$${ H }_{ 4 }$$

C
$$BiF_{ 5 }$$

D
Both (A) and (B)
Question 10
1 / -0

For which of the following change in Gibbs free energy will be negative?

A
$$ Ge^{+2} \longrightarrow Ge^{+4} $$

B
$$ Pb^{+2} \longrightarrow Pb^{+4} $$

C
$$ Sn^{+4} \longrightarrow Sn^{+2} $$

D
$$ Ga^{+3} \longrightarrow Ga^{+4} $$

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Re-Attempt Weekly Quiz Competition

The p-Block Elements Test - 70

Result

The p-Block Elements Test - 70

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SHARING IS CARING

Question 1

$$BC_2$$

$$B_4C_3$$

$$B_2C_3$$

$$B_4C$$

Question 2

14

4

9

7

Question 3

$${\text{C}}{{\text{H}}_{\text{4}}}{\text{ > Si}}{{\text{H}}_{\text{4}}}{\text{ > Ge}}{{\text{H}}_{\text{4}}}{\text{ > Sn}}{{\text{H}}_{\text{4}}}{\text{ > Pb}}{{\text{H}}_{\text{4}}}$$

$${\text{C}}{{\text{H}}_{\text{4}}}{\text{ < Si}}{{\text{H}}_{\text{4}}}{\text{ < Ge}}{{\text{H}}_{\text{4}}}{\text{ < Sn}}{{\text{H}}_{\text{4}}}{\text{ < Pb}}{{\text{H}}_{\text{4}}}$$

$${\text{C}}{{\text{H}}_{\text{4}}}{\text{ > Sn}}{{\text{H}}_{\text{4}}}{\text{ > Ge}}{{\text{H}}_{\text{4}}}{\text{ > Si}}{{\text{H}}_{\text{4}}}{\text{ > Pb}}{{\text{H}}_{\text{4}}}$$

None of these

Solution

Question 4

2

3

4

10

Solution

Question 5

$$Ge, Sn$$ and $$Pb$$ from $$+2$$ as well as $$+4$$ oxidation state

$$Ge^{2+}$$ and $$Sn^{2+}$$ compounds act as reducing agents

$$Pb^{4+}$$ compounds act as oxidizing agents

Stability increases from $$Ge^{2+}$$ to $$Pb^{2+}$$

Question 6

inert pair effect

Lanthanoid contraction

Diagonal relationship

none of these

Question 7

Sodium pyroborate

Boric anhydride

Sodium meta-berate

Boric anhydride and sodium metaborate

Solution

Question 8

Neutral

Acidic

Alkaline

Amphoteric

Solution

Question 9

$$BiCl_{5 }$$

Xe$${ H }_{ 4 }$$

$$BiF_{ 5 }$$

Both (A) and (B)

Question 10

$$ Ge^{+2} \longrightarrow Ge^{+4} $$

$$ Pb^{+2} \longrightarrow Pb^{+4} $$

$$ Sn^{+4} \longrightarrow Sn^{+2} $$

$$ Ga^{+3} \longrightarrow Ga^{+4} $$

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