The p-Block Elements Test

Result

The p-Block Elements Test - 23

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Weekly Quiz Competition

Question 1
1 / -0

The abundance of B, Al, Ga and Tl in earth crust follows the order:

A
$$B< Al< Ga< Tl$$

B
$$Tl< B< Al< Ga$$

C
$$Tl< Al< B< Ga$$

D
$$Tl< Ga< B< Al$$

Solution
Question 2
1 / -0

Which amongst the following is also called as a sesqui oxide?

A
$$B_{2}O_{3}$$

B
$$Al_{2}O_{3}$$

C
$$Tl_{2}O_{3}$$

D
All of the above

Solution

Sesquioxide is an oxide in which the ratio of atoms of oxygen and other atoms should be $$3:2$$ like $$B_2O_3, Al_2O_3, Tl_2O_3$$.
Question 3
1 / -0

Which of the following forms $$M_{2}O$$ type of oxide?

A
Al

B
B

C
Tl

D
Ca

Solution

$$Tl^{+}$$ (due to inert pair effect) is stable and forms compounds like $$Tl_{2}O$$.
Question 4
1 / -0

Which of the following species cannot exist?

A
$$[BF_{6}]^{3-}$$

B
$$[AlF_{6}]^{3-}$$

C
$$[GaF_{6}]^{3-}$$

D
$$[InF_{6}]^{3-}$$

Solution

$$B^{3+}$$, being small in size, does not have empty d-orbitals like other atoms to accommodate 6 electron pairs of 6$$F^{-}$$ ions.
Question 5
1 / -0

Which of the following oxides dissolves in both hydrochloric acid and sodium hydroxide solution? (1993)

A
Na

B
MgO

C
BaO

D
$$Al_{2}O_{3}$$

Solution

$$Al_{2}O_{3}$$ is an amphoteric oxide
Question 6
1 / -0

$$TlI_{3} $$ is:

A
an ionic compound consisting of $$Tl^{3+}$$ and three $$3I^{-}$$ ions

B
a covalent compound

C
an ionic compound consisting of $$Tl^{+}$$ and $$I_{3}^{-}$$ ions

D
a mixture of $$TlI$$ and $$I_{2}$$

Solution

$${T}{l}{I}+{I}_{2}\rightarrow {T}{l}^{+}+{I}_{3}^{-}({T}{l}{I}_{3})$$
So, it is an compound because of +1 oxidation state of Tl which is more ionic than +3 oxidation state.
Question 7
1 / -0

Catenation i.e., linking of similar atoms depends on the size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order:

A
C < Si < Ge < Sn

B
C > Si > Ge > Sn

C
Si > C > Sn > Ge

D
Ge > Sn > Si > C

Solution

Down the group, atomic size increases and electronegativity decreases. Therefore tendency of catenation decreases down the group as follows $$C > Si > Ge > Sn$$.
Question 8
1 / -0

Which of the following oxidation states are the most characteristic for lead and tin respectively:

A
$$+2,+2$$

B
$$+4, +2$$

C
$$+2, +4$$

D
$$+4, + 4$$

Solution

Lead and tin are in the fourth group of the periodic table,so we can expect an oxidation state of $$+4$$ for both of them.But due to the reluctance of participation of electrons in the outermost $$s$$ orbital in bonding i.e., inert pair effect which increases down the group.So, the oxidation states of lead and tin are $$+2$$ and $$+4$$ respectively which is also evident from their respective chemical reactions.
Question 9
1 / -0

The repeating structural units in silicone is:

A
$$(R_2SiO-)$$

B
$$SiO_{2}$$

C
$$R-O-Si-\underset {\overset {|}R}O-$$

D
$$(-R_2Si-O-O-R)$$

Solution

The repeating structural unit in silicones is shown in figure.
Question 10
1 / -0

Which of the following curves assures that the metal obtained by carbon reduction is in the vapour state?

A

B

C

D

Solution

Since after boiling point of M plot $$C\rightarrow CO$$ is below $$M\rightarrow MO$$, Hence metal can be obtained in vapour state.