${\rm{M}}{{\rm{g}}_2}{{\rm{C}}_3}$ has the following characteristics:

It is called magnesium allylide

It contains ${\rm{M}}{{\rm{g}}^{2 + }}\;and\;{\rm{C}}_3^{4 - }$ ions

${\rm{P}}{{\rm{b}}_3}{{\rm{O}}_4}$

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 31-60 of 102 questions

31 Medium

31 of 102

Analyzing +4 | -1

(A):

{PbI}_4

is stable compound.
(R): Iodide stabilizes higher oxidation state.

View answer and explanation

Correct option: D

Both (A) and (R) are false

Option D (Both (A) and (R) are false) is correct because

PbI_4

is unstable and iodide does not generally stabilize higher oxidation states.

32 Medium

32 of 102

Remembering +4 | -1

Tetra ethyl lead is used as:

View answer and explanation

Correct option: B

Antiknock compound

Option B (Antiknock compound) is correct because tetraethyl lead (TEL) was historically used as an antiknock agent in gasoline to increase its octane rating and prevent engine knocking.

33 Medium

33 of 102

Remembering +4 | -1

Standard state of carbon is

View answer and explanation

Correct option: A

Graphite

Option A (Graphite) is correct because graphite is the most thermodynamically stable allotrope of carbon under standard conditions.

34 Medium

34 of 102

Remembering +4 | -1

Clay is an example of

View answer and explanation

Correct option: D

Sheet silicates

Option D (Sheet silicates) is correct because clay minerals are composed of layers or sheets of silicate tetrahedra.

35 Medium

35 of 102

Remembering +4 | -1

Rose metal is an alloy of.

View answer and explanation

Correct option: A

Sn + Pb + Bi

Option A (Sn + Pb + Bi) is correct because Rose metal is an alloy composed of tin, lead, and bismuth.

36 Medium

36 of 102

Remembering +4 | -1

Which of the following compounds is used in cosmetic surgery.

View answer and explanation

Correct option: C

Silicones

Option C (Silicones) is correct because silicones are used in cosmetic surgery due to their biocompatibility and flexibility.

37 Medium

37 of 102

Remembering +4 | -1

Organosilicon polymers (silicones) have repeating unit as

View answer and explanation

Correct option: A

-\left({R}_2 {SiO}\right)-

Option A (

-\left({R}_2 {SiO}\right)-

) is correct because organosilicon polymers (silicones) have a repeating unit of

-\left({R}_2 {SiO}\right)-

38 Medium

38 of 102

Application +4 | -1

For carbon dating of a wood sample

\left(\frac{\mathrm{C}^{14}}{\mathrm{C}^{12}}\right)_\mathrm{t}=\frac{1}{8}\left(\frac{\mathrm{C}^{14}}{\mathrm{C}^{12}}\right)_{\mathrm{t}=0}

. If Half life of

\mathrm{C}^{14}

is 1580 years what is the life of wood sample (in yr)

View answer and explanation

Correct option: A

4740

Option A (4740) is correct because it is calculated using the half-life of C-14 and the given ratio of C-14 to C-12.

39 Medium

39 of 102

Analyzing +4 | -1

Assertion: The melting points of the Carbon family elements increase down the group.

Reason: The metallic bonding becomes stronger down the group due to the increased number of valence electrons.

View answer and explanation

Correct option: A

Both Assertion and Reason are true and Reason is the correct explanation for Assertion

Option A is correct because the melting points of the Carbon family elements increase down the group due to stronger metallic bonding from an increased number of valence electrons.

40 Medium

40 of 102

Remembering +4 | -1

Which gas when passed through dilute blood will impart a cherry red colour to the solution?

View answer and explanation

Correct option: D

\mathrm{CO}

Option D (CO) is correct because carbon monoxide (CO) reacts with hemoglobin in blood to form carboxyhemoglobin, which has a cherry-red color.

41 Medium

41 of 102

Understanding +4 | -1

Lead sulphate is soluble in :

View answer and explanation

Correct option: D

None of these

Option D (None of these) is correct because lead sulfate (

pb\mathrm{S}{\mathrm{O}_4}

) is generally considered insoluble in common reagents like concentrated nitric acid, potassium permanganate, or potassium dichromate.

42 Medium

42 of 102

Remembering +4 | -1

Number of 6 membered and five membered rings in

{C}_{60}

fullerene respectively are

View answer and explanation

Correct option: A

20 and 12

Option A (20 and 12) is correct because C60 fullerene contains 20 six-membered rings and 12 five-membered rings.

43 Medium

43 of 102

Remembering +4 | -1

Carborundum is obtained when silica is heated at high temperature with

View answer and explanation

Correct option: A

Carbon

Option A (Carbon) is correct because carborundum (silicon carbide, SiC) is produced by heating silica (

\mathrm{SiO_2}

) with carbon at high temperatures.

44 Medium

44 of 102

Remembering +4 | -1

Semi water gas is mixture of :

View answer and explanation

Correct option: A

Water gas and producer gas

Option A (Water gas and producer gas) is correct because semi-water gas is a mixture of both.

45 Medium

45 of 102

Understanding +4 | -1

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

has the following characteristics:

View answer and explanation

Correct option: D

All of the above

Option D is correct because Magnesium carbide (

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

) contains

\mathrm{M}{\mathrm{g}^{2 + }}\;and\;\mathrm{C}_3^{4 - }

ions, is called magnesium allylide, and produces propyne upon hydrolysis.

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

46 Medium

46 of 102

Remembering +4 | -1

Tin dissolves in dilute

\mathrm{HN}{\mathrm{O}_3}

forming :

View answer and explanation

Correct option: C

Ammonium nitrate

Option C (Ammonium nitrate) is correct because tin reacts with dilute nitric acid to produce stannous nitrate, ammonium nitrate, and water.

47 Medium

47 of 102

Understanding +4 | -1

Assertion (A): Graphite fibres embedded in plastic material form high strength, light weight composites.

Reason (R): The composites are used in products such as tennis rackets, fishing rods, aircrafts and canoes.

View answer and explanation

Correct option: B

Both

\mathrm{A}

and

\mathrm{R}

are correct;

\mathrm{R}

is not the correct explanation of

\mathrm{A}

Option B is correct because both the assertion and reason are true, but the reason does not explain why graphite fibers form high-strength composites.

48 Medium

48 of 102

Remembering +4 | -1

Red lead is:

View answer and explanation

Correct option: B

\mathrm{P}{\mathrm{b}_3}{\mathrm{O}_4}

Option B (

\mathrm{P}{\mathrm{b}_3}{\mathrm{O}_4}

) is correct because red lead is the common name for lead tetroxide, which has the formula

\mathrm{P}{\mathrm{b}_3}{\mathrm{O}_4}

49 Medium

49 of 102

Remembering +4 | -1

The variety of glass, used for the preservation of eggs is:

View answer and explanation

Correct option: C

Water glass

Option C (Water glass) is correct because water glass is a common name for sodium silicate, which is used for preserving eggs.

50 Medium

50 of 102

Remembering +4 | -1

The coal form containing maximum percentage of carbon is:

View answer and explanation

Correct option: B

Anthracite

Correct Answer + Core Reason: Option A (Anthracite) is correct because anthracite coal has the highest carbon content compared to other types of coal.

51 Medium

51 of 102

Remembering +4 | -1

Which of the following oxides is amphoteric in character?

View answer and explanation

Correct option: A

\mathrm{Sn}{\mathrm{O}_2}

Option A (

\mathrm{Sn}{\mathrm{O}_2}

) is correct because tin(IV) oxide (

\mathrm{Sn}{\mathrm{O}_2}

) exhibits amphoteric behavior, reacting with both acids and bases.

52 Medium

52 of 102

Understanding +4 | -1

The metal which does not form a polynuclear carbonyl is :

View answer and explanation

Correct option: A

Sodium

Option A (Sodium) is correct because alkali metals like sodium do not readily form polynuclear carbonyls due to their electronic structure and bonding characteristics.

53 Medium

53 of 102

Remembering +4 | -1

Stable form of ‘C’ may be represented by the formula

View answer and explanation

Correct option: B

{C_2}

Option B (

{C_2}

) is correct because the stable form of chlorine is diatomic, represented as Cl2 or C2.

54 Medium

54 of 102

Analyzing +4 | -1

Consider the following statement(s) regarding CO.

I. CO has one

\sigma

and two

\pi

-bonds.

II. CO acts as electron donor.

III. CO has one lone pair on its carbon atom.

IV. CO reacts with all metals to produce metal carbide.

The correct statements are

View answer and explanation

Correct option: A

I, II and III

Option A (I, II and III) is correct because CO has one sigma and two pi bonds, acts as an electron donor, and has one lone pair on its carbon atom.

55 Medium

55 of 102

Remembering +4 | -1

Which of the following is a three dimensional silicate?

View answer and explanation

Correct option: C

Zeolite

Option C (Zeolite) is correct because zeolites have a three-dimensional network structure of silicate tetrahedra.

56 Medium

56 of 102

Understanding +4 | -1

Which of the following is a mixed oxide?

View answer and explanation

Correct option: C

\mathrm{P}{\mathrm{b}_3}{\mathrm{O}_4}

Option C (

\mathrm{P}{\mathrm{b}_3}{\mathrm{O}_4}

) is correct because it can be represented as a combination of two oxides of lead,

2\mathrm{PbO}\mathrm{.Pb}{\mathrm{O}_2}

57 Medium

57 of 102

Remembering +4 | -1

{CCl}_4

is used as a fire extinguisher because of

View answer and explanation

Correct option: D

It gives incombustible vapors

Option D (It gives incombustible vapors) is correct because carbon tetrachloride (

CCl_4

) is used as a fire extinguisher because it produces heavy, non-combustible vapors that displace oxygen and smother the fire.

58 Medium

58 of 102

Remembering +4 | -1

The acid used for etching the glass is:

View answer and explanation

Correct option: C

Hydrofluoric acid

Option C (Hydrofluoric acid) is correct because hydrofluoric acid (HF) reacts with silica in glass, allowing it to etch the glass surface.

59 Medium

59 of 102

Understanding +4 | -1

Monosilane on coming in contact with air burns with a luminous flame producing vortex rings. These rings are of

View answer and explanation

Correct option: A

\mathrm{Si}{\mathrm{O}_2}

The correct answer is A (

\mathrm{SiO}_2

) because silanes burn in air to form silicon dioxide, which creates the vortex rings.

60 Medium

60 of 102

Understanding +4 | -1

The correct statement among the following

a) Fullerene has both single and double bonds

b)

C-C

bond lengths in fullerene are 143.5 PM and 138.3 PM

c) Fullerene has one electron at each carbon which is delocalized into molecular orbitals

d) Fullerene is aromatic in nature.

View answer and explanation

Correct option: C

a, b, c & d

Option C (a, b, c & d) is correct because fullerenes possess both single and double bonds, specific bond lengths, delocalized electrons, and exhibit aromatic character.

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.

Showing 31-60 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