BPSC PGT Chemistry: p-Block Elements Question Bank

BPSC PGT Chemistry: p-Block Elements Question Bank – Carbon Family

Home » BPSC PGT Chemistry » BPSC PGT Chemistry: p-Block Elements Question Bank – Carbon Family

This set of BPSC PGT Chemistry Multiple Choice Questions (MCQs) focuses on “p-Block Elements – Group 14 Elements: Carbon Family.”

All the elements in group 14 exhibit tetravalency.

a) true

b) false

Answer: a

Explanation: For carbon, promoting a 2s electron to the 2p orbital requires 406 kJ/mol of energy. This energy is compensated by the formation of two additional covalent bonds. As a result, all group 14 elements exhibit tetravalency, making the given statement true.

Why hydrides of Germanium are known as _____________

a) silanes

b) germanes

c) stannum

d) plumbane

Answer: b
Explanation: The hydrides of carbon are known as hydrocarbons and include alkanes, alkenes, and alkynes. In contrast, the hydrides of silicon are called silanes, while those of germanium are known as germanes. The only known hydrides of tin (stannum) and lead (plumbum) are stannane and plumbane, respectively.

The group 14 elements form _____________ hydrides.

a) metallic

b) ionic

c) covalent

d) both covalent and ionic

Answer: c
Explanation: All group 14 elements form covalent hydrides. However, both the number of hydrides formed and the ease with which they are produced decrease as we move down the group. Additionally, their thermal stability also decreases, while their reducing nature increases down the group.

The ionization enthalpy and density increase in the group from top to bottom.

a) true
b) false

Answer: b
Explanation: As we move down the group, density increases due to the rise in mass per unit volume. Ionization enthalpy generally decreases from carbon to tin (stannum); however, for lead (plumbum), it is slightly higher than that of tin. Therefore, the given statement is incorrect and considered false.

Which of the following elements does not belong to the Carbon family?

a) aluminium

b) silicon

c) plumbum

d) stannum

Answer: a

Explanation: The carbon family consists of the group 14 elements, which include carbon, silicon, germanium, tin (stannum), and lead (plumbum). These elements have a valence shell electronic configuration of ns²np² and typically exhibit a valency of four. In contrast, aluminium belongs to group 13 and is not part of the carbon family.

What is the colour of silicon?

a) blue

b) silver

c) black

d) light brown

Answer: d

Explanation: A key physical property of group 14 elements is their distinct colors. Carbon appears black, silicon is light brown, germanium has a greyish tone, while both tin (stannum) and lead (plumbum) exhibit a silvery white color.

What is the Fajan’s rule about?

a) electronegativity

b) ionic compounds

c) Oxidation State

d) covalent compounds

Answer: c

Explanation: According to Fajan’s rule, compounds in the +2 oxidation state tend to be ionic, while those in the +4 oxidation state are typically covalent. Thus, Fajan’s rule relates to the oxidation states of elements and the corresponding nature (ionic or covalent) of their compounds.

Which of the following group 14 elements is a metal?

a) Stannum

b) Carbon

c) Germanium

d) Silicon

Answer: a
Explanation: The carbon family, also known as group 14, consists of five main elements: carbon, silicon, germanium, tin (stannum), and lead (plumbum). Among them, carbon and silicon are non-metals, germanium is a metalloid, while tin and lead are classified as metals.

Do Carbon family elements show multiple bonding?

a) Yes

b) Maybe

c) No

d) Cannot say

Answer: a

Explanation: Yes, carbon can form pπ-pπ multiple bonds with itself as well as with elements like sulfur, nitrogen, and oxygen. In contrast, other group 14 elements show very little tendency to form such bonds due to their larger atomic size. Instead, they are more likely to form dπ-pπ multiple bonds.

Which of the following is called the bitter of tin?

a) SnCl2.5HO

b) SnCl2.H2O

c) SnCl.5H2O

d) SnCl2.5H2O

Answer: d

Explanation: The compound stannous chloride, when combined with 5 moles of water, is known as bitter of tin. It is used as a mordant in dyeing because it helps produce bright colors. Its chemical formula is SnCl₂·5H₂O, and it appears as a white crystalline solid.

Is catenation possible in carbon?

a) Yes

b) Maybe

c) No

d) Cannot say

Answer: a

Explanation: Catenation refers to the ability of an element to form long chains composed of repeated atoms of the same kind. This tendency is directly related to the strength of the element’s bonds. In the carbon family, the catenation ability decreases in the following order: carbon > silicon > germanium ≈ tin (stannum) > lead (plumbum).

Which of the following is true regarding the thermal stability of halides of Carbon family?

a) CX4 > Si X4 > Ge X4 < Sn X4 > Pb X4

b) CX4 > Si X4 > Ge X4 > Sn X4 > Pb X4

c) CX4 > Si X4 > Ge X4 > Sn X4 < Pb X4

d) CX4 < Si X4 > Ge X4 > Sn X4 > Pb X4

Answer: b

Explanation: All the elements of the carbon family form tetrahedral, covalent halides of the type MX₄. The thermal stability of these halides decreases in the following order: CX₄ > SiX₄ > GeX₄ > SnX₄ > PbX₄, for the group 14 elements.

How many types of oxides do Carbon family form?

a) 9

b) 4

c) 3

d) 2

Answer: d

Explanation: The carbon family can form two types of oxides. One type is mono-oxides, such as carbon monoxide (CO) and silicon monoxide (SiO), which are basic in nature. The second type is dioxides, like carbon dioxide (CO₂) and silicon dioxide (SiO₂), which are acidic. The dioxides of germanium, silicon, and lead (plumbum) are amphoteric.

Which of the following oxidation States to group 14 elements exhibit?

a) +1, +5

b) +5, +2

c) +2, +4

d) +3, +5

Answer: c

Explanation: The elements of the carbon family show +2 and +4 oxidation states. Compounds of lead (plumbum) in the +4 oxidation state act as powerful oxidizing agents because the +2 oxidation state of lead is more stable, primarily due to the inert pair effect.

The dry ice is _____________

a) solid carbon dioxide

b) liquid carbon dioxide

c) gaseous carbon dioxide

d) plasma carbon dioxide

Answer: a

Explanation: Carbon dioxide is a linear gas at normal temperatures, but at low temperatures, it exists in a solid form, commonly known as dry ice or drikold. It is used for storing frozen substances at temperatures lower than that of water and is also employed for cooling purposes.

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