Carbon suboxide ${{\rm{C}}_3}{{\rm{O}}_2}$ has

Distorted tetrahedral structure

Mixture of ${{\rm{O}}_2} + 5 - 10{\rm{\% }}\;{\rm{C}}{{\rm{O}}_2}$

Used by pneumonia patients for respiration

Used by victims of CO for respiration

Statement-1: The $C-O$ bond in $CO^{+}$is longer than in $CO$. Statement-2: In changing from $CO$ to $CO^{+}$, the electron is removed from nonbonding molecular orbital having anti-bonding character.

Statement-1 is true, statement-2 is true and statement- 2 is correct explanation for statement-1.

Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.

Statement- 1 is false, statement-2 is true.

Back to 14 TH GROUP ELEMENTS (P-BLOCK)

Your Progress

0 / 102 Answered

Correct

Incorrect

Accuracy

JEE • CHEMISTRY • 14 TH GROUP ELEMENTS (P-BLOCK)

14 th group elements (p-block) practice · Medium

Try a question, then open “View answer” to check it. Sign in to submit answers and save progress.

Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

Take a chapter quiz →

Showing 1-30 of 102 questions

1 Medium

1 of 102

Understanding +4 | -1

Which of the following does not exist

View answer and explanation

Correct option: A

SiCl_6^{ - 2}

Option A (

SiCl_6^{ - 2}

) is correct because Silicon, due to its smaller size and lack of available d-orbitals for bonding, cannot accommodate six large chloride ions around it.

2 Medium

2 of 102

Remembering +4 | -1

Which is pyrosilicate :-

View answer and explanation

Correct option: A

{Zn}_3 {Si}_2 {O}_7 \cdot {Zn}({OH})_2

Option A (

{Zn}_3 {Si}_2 {O}_7 \cdot {Zn}({OH})_2

) is correct because pyrosilicates contain the

Si_2O_7^{-6}

unit, which is present in this compound.

3 Medium

3 of 102

Remembering +4 | -1

The correct statement with respect to carbon monoxide is:

View answer and explanation

Correct option: B

It reacts with haemoglobin in red blood cells.

Option B is correct because carbon monoxide (CO) has a high affinity for hemoglobin, binding more strongly than oxygen and thus interfering with oxygen transport in red blood cells.

4 Medium

4 of 102

Understanding +4 | -1

Assertion (A) :

{SiF}_6^{2-}

is known but

{SiCl}_6^{2-}

is not known.

Reason (R) : Interaction of

F

lone pair electrons with

{Si}

is stronger than that of chlorine and due to smaller size of

{F}

steric repulsion will be less.

View answer and explanation

Correct option: A

Both

\mathbf{A}

and

\mathbf{R}

are true and

\mathbf{R}

is the correct explanation of

\mathbf{A}

Option A is correct because both the assertion and the reason are true, and the reason correctly explains why

{SiF}_6^{2-}

exists while

{SiCl}_6^{2-}

does not, relating to the interaction of lone pairs and steric hindrance.

5 Medium

5 of 102

Understanding +4 | -1

Assertion (A):

\mathrm{CaC}_2

is interstitial carbide.

Reason (R): Calcium ions are present in the Interstices.

View answer and explanation

Correct option: D

Both (A) and (R) are false

Option D is correct because both the assertion and the reason are false. Calcium carbide (

CaC_2

) is not an ionic carbide, and the ions present are

Ca^{2+}

and

C_2^{2-}

6 Medium

6 of 102

Understanding +4 | -1

The tendency of catenation in group – 14 elements follows the order

View answer and explanation

Correct option: B

C > > Si > Ge = Sn

Option B (

C > > Si > Ge = Sn

) is correct because the catenation tendency decreases down the group due to decreasing bond strength.

7 Medium

7 of 102

Remembering +4 | -1

Nature of

C{O_2}\,\,\& \,\,Si{O_2}

are respectively.

View answer and explanation

Correct option: C

Acidic, acidic

Option C (Acidic, acidic) is correct because both carbon dioxide (

\mathrm{CO_2}

) and silicon dioxide (

\mathrm{SiO_2}

) are acidic oxides.

8 Medium

8 of 102

Remembering +4 | -1

Which fuel has the highest calorific value (kJ/kg)?

View answer and explanation

Correct option: B

Kerosene

Option B (Kerosene) is correct because kerosene has a higher calorific value compared to charcoal, wood, and cow dung, meaning it releases more heat per unit mass when burned.

9 Medium

9 of 102

Remembering +4 | -1

When gypsum is heated to

393 K,

it forms:

View answer and explanation

Correct option: B

CaS{O_4}.0.5{H_2}O

Option B (

CaS{O_4}.0.5{H_2}O

) is correct because when gypsum (

CaS{O_4}.2{H_2}O

) is heated to 393 K, it loses water molecules to form plaster of Paris (

CaS{O_4}.0.5{H_2}O

10 Medium

10 of 102

Remembering +4 | -1

The different layers in graphite are held together by

View answer and explanation

Correct option: D

Van\;\mathrm{der}Waals'\;forces

Option D (Van der Waals' forces) is correct because the different layers in graphite are held together by weak van der Waals' forces.

11 Medium

11 of 102

Remembering +4 | -1

The common basic structural unit in silicates and silica is

View answer and explanation

Correct option: C

{SiO}_4^{4-}

Option C (

{SiO}_4^{4-}

) is correct because the basic structural unit in silicates and silica is the tetrahedral

{SiO}_4^{4-}

unit.

12 Medium

12 of 102

Analyzing +4 | -1

Which of the following is incorrect statement

View answer and explanation

Correct option: B

Pb{F_4}

is easily hydrolysed

Option B is the correct answer because

PbF_4

is ionic in nature, not easily hydrolysed due to the small size and high electronegativity of fluorine.

13 Medium

13 of 102

Remembering +4 | -1

The greatest percentage of CO is in:

View answer and explanation

Correct option: C

Water gas

Option C (Water gas) is correct because water gas contains the highest percentage of CO among the given options.

14 Medium

14 of 102

Understanding +4 | -1

Which of the following gives propyne on hydrolysis?

View answer and explanation

Correct option: D

\mathrm{M}{\mathrm{g}_2}{\mathrm{C}_3}

The correct answer is

\mathrm{M}{\mathrm{g}_2}{\mathrm{C}_3}

because magnesium carbide (

\mathrm{M}{\mathrm{g}_2}{\mathrm{C}_3}

) undergoes hydrolysis to produce propyne.

15 Medium

15 of 102

Understanding +4 | -1

Carbon suboxide

{\mathrm{C}_3}{\mathrm{O}_2}

has

View answer and explanation

Correct option: C

Linear structure

Option C (Linear structure) is correct because carbon suboxide has a linear structure with alternating double bonds between carbon and oxygen atoms.

Explore Other Chapters in CHEMISTRY

View All →

P-BLOCK ELEMENTS 736 MCQs Equilibrium 696 MCQs STRUCTURE OF ATOM 634 MCQs THERMODYNAMICS 536 MCQs CHEMICAL BONDING & MOLECULAR STRUCTURE 514 MCQs SOLUTIONS 480 MCQs

16 Medium

16 of 102

Analyzing +4 | -1

Assertion (A):

Ge{F_4}

and

Si{F_4}

acts as Lewis bases
Reason (R):

Ge

and

Si

have

d -

orbitals to accept a pair of electrons

View answer and explanation

Correct option: D

A is not correct but R is correct.

Option D (A is not correct but R is correct) is correct because GeF4 and SiF4 act as Lewis acids, not bases, due to the presence of vacant d-orbitals on Ge and Si.

17 Medium

17 of 102

Analyzing +4 | -1

{\left[ {S{F_6}} \right]^{2 - }}

is well known whereas

{\left[ {SiC{l_6}} \right]^{2 - }}

not. The main reason is/are:
I) Six large chloride ions cannot be accommodated around

S{i^{4 + }}

due to limitation of its size.
II) Interaction between lone pair of

C{l^ - }

ion and

S{i^{4 + }}

ion is not very strong.

View answer and explanation

Correct option: C

Both are correct

The correct answer is C because both statements are correct; the larger size of chloride ions and the limited size of Si4+ prevent six chloride ions from being accommodated, and the interaction between chloride and silicon is not strong enough.

18 Medium

18 of 102

Remembering +4 | -1

Carbogen is:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because carbogen is indeed a mixture of O2 + 5-10% CO2, and it's used for respiration by pneumonia patients and CO poisoning victims.

19 Medium

19 of 102

Analyzing +4 | -1

Identify the correct statements among the following

(i) standard enthalpies of formation of allotropes of carbon are in the order fullerene > Diamond

>

graphite
(ii) Boric acid is a monoprotic acid

(iii) Hydrolysed product of

\mathrm{SiCl}_4

on polymerization produce Silicones

(iv) First ionization enthalpies of

13^{\text {th }}

group elements follow the order In

< A l \cong G a < T l < B

View answer and explanation

Correct option: A

(i),(i v)

Option A ((i), (iv)) is correct. Standard enthalpies of formation increase in the order graphite < diamond < fullerene, and the ionization enthalpies of group 13 elements follow the given order.

20 Medium

20 of 102

Understanding +4 | -1

(A): Zeolites are used as ion exchangers and molecular sieves.

(R): Zeolites consist cavities of different sizes and can trap

{Ca}^{+2}

ions from hard water and also molecules like

{NH}_3, {CO}_2

View answer and explanation

Correct option: A

Both (A) and (R) are true and (R) is the correct explanation of (A)

Option A (Both (A) and (R) are true and (R) is the correct explanation of (A)) is correct because zeolites' structure with cavities allows them to act as ion exchangers and molecular sieves.

21 Medium

21 of 102

Analyzing +4 | -1

Statement-1: The

C-O

bond in

CO^{+}

is longer than in

CO

.
Statement-2: In changing from

CO

CO^{+}

, the electron is removed from nonbonding molecular orbital having anti-bonding character.

View answer and explanation

Correct option: C

Statement- 1 is true, statement-2 is false.

The correct answer is C because Statement-1 is true, but Statement-2 is false. Removing an electron from CO to form CO+ shortens the bond length, and the electron is removed from a bonding orbital.

22 Medium

22 of 102

Remembering +4 | -1

Sesquioxide of lead is:

View answer and explanation

Correct option: D

\mathrm{P}{\mathrm{b}_2}{\mathrm{O}_3}

Option D (

\mathrm{P}{\mathrm{b}_2}{\mathrm{O}_3}

) is correct because sesquioxide of lead is

\mathrm{P}{\mathrm{b}_2}{\mathrm{O}_3}

, which can also be written as

\mathrm{PbO} \cdot \mathrm{Pb}{\mathrm{O}_2}

23 Medium

23 of 102

Remembering +4 | -1

The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are

View answer and explanation

Correct option: D

2, 0 and 0.5

Option D (2, 0 and 0.5) is correct because the chemical formulas are

CaSO_4 \cdot 2H_2O

(gypsum),

CaSO_4

(dead burnt plaster), and

CaSO_4 \cdot \frac{1}{2}H_2O

(plaster of Paris).

24 Medium

24 of 102

Analyzing +4 | -1

Assertion:

{PbI}_4

is a stable compound.

Reason: Iodide stabilizes higher oxidation state.

View answer and explanation

Correct option: D

If both the Assertion and Reason are incorrect.

Option D (If both the Assertion and Reason are incorrect) is correct because PbI4 is unstable, and iodide does not stabilize higher oxidation states of lead.

25 Medium

25 of 102

Remembering +4 | -1

Solder is an alloy of :

View answer and explanation

Correct option: B

Pb and Sn

Option B (Pb and Sn) is correct because solder is a metallic alloy traditionally made of tin (Sn) and lead (Pb) used for joining metal surfaces.

26 Medium

26 of 102

Remembering +4 | -1

The calorific value of carbon is about ……. kcal.

View answer and explanation

Correct option: A

7.8

Option A (7.8) is correct because the calorific value of carbon is approximately 7.8 kcal/g.

27 Medium

27 of 102

Remembering +4 | -1

Silicon carbide is used as:

View answer and explanation

Correct option: B

Abrasive

Option B (Abrasive) is correct because silicon carbide is extremely hard and is used as an abrasive material.

28 Medium

28 of 102

Analyzing +4 | -1

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason
(R).
Assertion (A): Gypsum is used for making fireproof wall boards.
Reason (R): Gypsum is unstable at high temperatures.
In the light of the above statements, choose the correct answer from the options given below

View answer and explanation

Correct option: C

Both (A) and (R) are correct but (R) is not the correct explanation of (A)

The correct answer is C (Both (A) and (R) are correct but (R) is not the correct explanation of (A)) because gypsum is indeed used for fireproof wall boards, and it is unstable at high temperatures, but the instability isn't the reason for its fireproofing properties.

29 Medium

29 of 102

Understanding +4 | -1

Which of the following statements are correct

a) Fullerenes have dangling bonds

b) Fullerenes are cage like molecules

c) Graphite is thermodynamically most stable allotrope of carbon

View answer and explanation

Correct option: A

b, c

Option A (b, c) is correct because fullerenes are cage-like molecules, and graphite is the thermodynamically most stable allotrope of carbon. Fullerenes do not have dangling bonds.

30 Medium

30 of 102

Understanding +4 | -1

Number of oxygen atoms shared per

{SiO}_4^{4-}

tetrahedron in

I. two dimensional sheet structured silicates

II. cyclic silicates and

III. single strand chain silicates respectively are

View answer and explanation

Correct option: B

3,2,2

Option B is correct because in two-dimensional sheet silicates, three oxygen atoms are shared, while in cyclic and single-strand chain silicates, two oxygen atoms are shared per

{SiO}_4^{4-}

tetrahedron.

Revision notes and key takeaways

Review 14 TH GROUP ELEMENTS (P-BLOCK) in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 102 single-correct-answer MCQs on 14 TH GROUP ELEMENTS (P-BLOCK).
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

Showing 1-30 of 102 questions

Continue Your Practice

📚 Switch Set (MEDIUM)

Chapter Sets

ALL 197 MCQs EASY 85 MCQs HARD 10 MCQs MEDIUM 102 MCQs

0 /102

0✓ 0✗

0% Accuracy