The p-Block Elements Test

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The p-Block Elements Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following silicate is called disilicate?

A
Orthosilicate

B
Pyrosilicate

C
Single-chain silicate

D
None of these

Solution

Pyrosilicate is called disilicate.Orthosilicate has $$SiO_4^{4-}$$unit.

Pyrosilicate has $$SiO_7^{2-}$$. Single chain silicates are called pyroxene.

They contain a linear single strand chain of composition $$(SiO_3)_n^{2-}$$ in which two oxygen atoms per tetrahedron are shared.

Examples include Spodumene $$LiAl(SiO_3)_2$$ and Enstatite $$MgSiO_3$$.
Question 2
1 / -0

Which of the following metals burn in air at high temperature with the evolution of much heat?

A
Cu

B
Hg

C
Pb

D
Al

Solution

Aluminium burns in air and releases much high heat.

$$4Al + 3O_2 \rightarrow 2Al_2O_3$$ and releases much high heat.

Hence,option D is correct.
Question 3
1 / -0

The ion(s) that act/s as oxidizing agent in solution is/ are :

A
$$Tl^+$$ and $$Al^{3+}$$

B
$$B^{3+}$$ and $$Al^{3+}$$

C
$$Tl^{3+}$$ only

D
$$B^{3+}$$ only

Solution

The stability of lower oxidation state on moving down the group is increases due to inert pair pair effect.

Only $$Tl^{3+}$$ is stable in +1 oxidation state than +3.

As we move down the group, the tendency of s-electrons of the valence shell to participate in bond formation decreases.

Hence,option C is correct.
Question 4
1 / -0

Which statement is correct with respect to the property of the elements with increase in atomic number in the carbon family?

A
Their metallic character decreases

B
The stability of +2 oxidation state increases

C
Their ionization energy increases

D
Their atomic size decreases

Solution

Due to the inert pair effect, as we move down the group, lower oxidation state becomes more stable, so stability of 2+ oxidation state increases.
Question 5
1 / -0

Name the structure of silicate in which three oxygen atoms of $$[SiO_4]^{4-}$$ are shared :

A
pyrosilicate.

B
sheet silicate.

C
linear chain silicate.

D
three dimensional silicate.

Solution

Two dimensioanl sheet silicates: In such silicates, three oxygen atoms of each tetrahedral are shared with adjacent $$SiO^{4-}_4$$ tetrahedral, such sharing forms two dimensional sheet strtucre with general formula $$(Si_2O_5)^{2n-}_n$$
Ex. Talc $$Mg(Si_2O_5)_2Mg(OH)_2$$
The structure of silicates has been found with the help of X-ray diffraction techniques.

Hence,option B is correct.
Question 6
1 / -0

The balanced equation for the reaction when calcium phosphate is heated with a mixture of sand and carbon is given by:

A
$$2Ca_3(PO_4)_2 +6SiO_2 +10C \rightarrow 6CaSiO_3 +10CO +P_4$$

B
$$2Ca_3(PO_4)_2 +4SiO_2 +15C \rightarrow 6CaSiO_3 +10CO +P_4$$

C
$$2Ca_3(PO_4)_2 +6SiO_2 +6C \rightarrow 6CaSiO_3 +10CO +P_4$$

D
$$2Ca_3(PO_4)_2 +5SiO_2 +10C \rightarrow 6CaSiO_3 +10CO +P_4$$

Solution

The balanced equation for the reaction when calcium phosphate is heated with a mixture of sand and carbon.

$$2Ca_3(PO_4)_2 +6SiO_2 +10C \rightarrow 6CaSiO_3 +10CO +P_4$$

The products are calcium silicate, carbon monoxide and phosphorous.
Question 7
1 / -0

The stability of +1 oxidation state increases in the sequence:

A
$$Tl < In < Ga < Al$$

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

C
$$Ga < In < AI < Tl$$

D
$$Al < Ga < In < Tl$$

Solution

Explanation:
The inert pair effect is seen in the post-transition elements.
It is a phenomenon in which the electron pair of $$s$$ orbital remains inert.
Inert pair effect increases down the group.

Therefore, the stability of $$+1$$ oxidation state increases in the sequence

$$Tl$$ > $$In$$ >$$Ga$$ > $$Al$$.

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

Among the following substituted silanes the one which will give rise to cross-linked silicone polymer on hydrolysis is :

A
$$R_3SiCl$$

B
$$R_4Si$$

C
$$RSiCl_3$$

D
$$R_2SiCl_2$$

Solution

Explanation:
Option A): On hydrolysis of $$R_3SiCl$$, it forms monohydroxy silane derivative.
Option B): $$R_4Si$$ is inert to hydrolysis and can't undergo polymerization due to lack of $$Cl$$ group.
Option C): $$RSiCl_3$$ reacts with water to form hydroxide which on polymerization gives cross-linked silicone polymer.

$$RSiCl_3$$ + $$3H_2O \rightarrow RSi{(OH)}_3 + 3HCl$$
$$RSi{(OH)}_3$$ will give cross-linked silicone polymer on polymerization.
Option D): On hydrolysis, the $$Cl$$ gets replaced by $$OH$$ to form a dihydroxy silane derivative. This can lead to straight-chain polymerization.
Hence, the correct answer is option $$C$$.
Question 9
1 / -0

Which of the following has a giant covalent structure ?

A
$$PbO_{2}$$

B
$$SiO_{2}$$

C
$$NaCl$$

D
$$AlCl_{3}$$

Solution
Question 10
1 / -0

$$Si_6O_{18}^{12-}$$ unit is an example of :

A
3D silicate.

B
double chain silicate.

C
cyclic silicate.

D
2D silicate.

Solution

$$Si_6O_{18}^{12-}$$ is an example of cyclic silicate. An example is beryl $$Be_3Al_2Si_6O_{18}$$

Each ring contains 6 tetrahedron and each tetrahedron shares 2 oxygen atoms.

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The p-Block Elements Test - 28

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The p-Block Elements Test - 28

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Question 1

Orthosilicate

Pyrosilicate

Single-chain silicate

None of these

Solution

Question 2

Cu

Hg

Pb

Al

Solution

Question 3

$$Tl^+$$ and $$Al^{3+}$$

$$B^{3+}$$ and $$Al^{3+}$$

$$Tl^{3+}$$ only

$$B^{3+}$$ only

Solution

Question 4

Their metallic character decreases

The stability of +2 oxidation state increases

Their ionization energy increases

Their atomic size decreases

Solution

Question 5

pyrosilicate.

sheet silicate.

linear chain silicate.

three dimensional silicate.

Solution

Question 6

$$2Ca_3(PO_4)_2 +6SiO_2 +10C \rightarrow 6CaSiO_3 +10CO +P_4$$

$$2Ca_3(PO_4)_2 +4SiO_2 +15C \rightarrow 6CaSiO_3 +10CO +P_4$$

$$2Ca_3(PO_4)_2 +6SiO_2 +6C \rightarrow 6CaSiO_3 +10CO +P_4$$

$$2Ca_3(PO_4)_2 +5SiO_2 +10C \rightarrow 6CaSiO_3 +10CO +P_4$$

Solution

Question 7

$$Tl < In < Ga < Al$$

$$Tl < Ga < In < Al$$

$$Ga < In < AI < Tl$$

$$Al < Ga < In < Tl$$

Solution

Question 8

$$R_3SiCl$$

$$R_4Si$$

$$RSiCl_3$$

$$R_2SiCl_2$$

Solution

Question 9

$$PbO_{2}$$

$$SiO_{2}$$

$$NaCl$$

$$AlCl_{3}$$

Solution

Question 10

3D silicate.

double chain silicate.

cyclic silicate.

2D silicate.

Solution

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