Magnesium wire burns in the atmosphere of ${\rm{C}}{{\rm{O}}_2}$ because:

Magnesium acts as an oxidizing agent

Magnesium has 2 electrons in the outermost orbit

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JEE • CHEMISTRY • S-BLOCK ELEMENTS

S-block elements practice · Mixed difficulty

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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.

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Showing 31-60 of 303 questions

31 Easy

31 of 303

Remembering +4 | -1

The starting material used in Solvay’s process are

View answer and explanation

Correct option: B

Brine solution

Option B (Brine solution) is correct because brine solution (28% NaCl) is the starting material used in Solvay's process to produce sodium carbonate.

32 Easy

32 of 303

Understanding +4 | -1

Identify the correct statement:

View answer and explanation

Correct option: C

Gypsum contains a lower percentage of calcium than Plaster of Paris

Option D (Gypsum is obtained by heating Plaster of Paris) is correct because gypsum is formed by the hydration of Plaster of Paris.

33 Easy

33 of 303

Remembering +4 | -1

Potassium is kept in

View answer and explanation

Correct option: B

Kerosene

Option B (Kerosene) is correct because potassium is a highly reactive alkali metal that reacts vigorously with water, alcohol, and ammonia, so it's stored in kerosene to prevent these reactions.

34 Easy

34 of 303

Understanding +4 | -1

Assertion (A) : The mobility of sodium ion is lower than that of potassium ion.

Reason (R): The ionic mobilities depend on the effective radius of the ion.

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 (Both A and R are true and R is the correct explanation of A) is correct because smaller hydrated size of K+ compared to Na+ leads to higher mobility.

35 Medium

35 of 303

Understanding +4 | -1

Magnesium wire burns in the atmosphere of

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

because:

View answer and explanation

Correct option: C

Magnesium acts as a reducing agent and removes oxygen from

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

Option C is correct because magnesium acts as a reducing agent, removing oxygen from

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

due to its higher reducing power than carbon.

36 Easy

36 of 303

Remembering +4 | -1

Which element of IA group is most abundantly found in combined state?

View answer and explanation

Correct option: B

Option B (Cast iron) is correct because cast iron contains the highest percentage of carbon (2-5%) compared to the other options.

37 Medium

37 of 303

Understanding +4 | -1

Which of the following statement is false?

View answer and explanation

Correct option: D

\mathrm{Na}^{+}

ions are the most abundant cations within cell fluids

Option D is the false statement.

\mathrm{K}^+

ions, not

\mathrm{Na}^+

ions, are the most abundant cations within cell fluids.

38 Easy

38 of 303

Understanding +4 | -1

The activity of alkaline earth metals as reducing agents

View answer and explanation

Correct option: B

Increases from Be to Ba

Option B (Increases from Be to Ba) is correct because the reducing power of alkaline earth metals increases down the group due to decreasing ionization enthalpy.

39 Easy

39 of 303

Remembering +4 | -1

Molecular formula of Glauber’s salt is

View answer and explanation

Correct option: C

N{a_2}S{O_4}.10\,{H_2}O

Option C (

Na_2SO_4.10H_2O

) is correct because Glauber's salt is the common name for sodium sulfate decahydrate.

40 Easy

40 of 303

Remembering +4 | -1

Which alkaline earth metal forms peroxide on burning in air?

View answer and explanation

Correct option: D

\mathrm{Ba}

Option D (

\mathrm{Ba}

) is correct because barium, when burned in air, forms barium peroxide (

\mathrm{Ba}{\mathrm{O}_2}

41 Easy

41 of 303

Remembering +4 | -1

Sodium bicarbonate is manufactured by:

View answer and explanation

Correct option: D

Solvay process

Option D (Solvay process) is correct because the Solvay process is the industrial process used for the production of sodium carbonate, with sodium bicarbonate as an intermediate product.

42 Easy

42 of 303

Remembering +4 | -1

Mortar is mixture of

View answer and explanation

Correct option: A

Ca{\left( {OH} \right)_2}

silica and water

Option A (

Ca(OH)_2

silica and water) is correct because mortar is a mixture of calcium hydroxide, silica, and water, which hardens over time due to chemical reactions.

43 Medium

43 of 303

Understanding +4 | -1

Sodium thiosulphate is formed when:

View answer and explanation

Correct option: C

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_3}

is boiled with

\mathrm{N}{\mathrm{a}_2}\mathrm{S}

and

{\mathrm{I}_2}

Option C (

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_3}

is boiled with

\mathrm{N}{\mathrm{a}_2}\mathrm{S}

and

{\mathrm{I}_2}

) is correct because sodium thiosulphate is formed by the reaction of sodium sulfite with sodium sulfide in the presence of iodine.

44 Medium

44 of 303

Analyzing +4 | -1

A: Among alkali metals, Lithium is the strongest reducing agent.

R:

\mathrm{Li}^{+}

ions are heavily hydrated in water and large amount of hydration energy helps in the release of electrons from

\mathrm{Li}

atoms.

View answer and explanation

Correct option: A

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

Option A is correct because Lithium is indeed the strongest reducing agent among alkali metals, and this is due to the high hydration energy of Li+ ions.

45 Medium

45 of 303

Analyzing +4 | -1

{BeSO}_4

and

{MgSO}_4

decompose on heating.

R: Lattice structures are not stable when anions and cations are not of comparable size.

View answer and explanation

Correct option: A

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

Option A is correct because BeSO4 and MgSO4 decompose due to the large difference in size between the cation and anion, leading to lower lattice energy.

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46 Medium

46 of 303

Analyzing +4 | -1

Statement 1: Lithium is the weakest reducing agent among alkali metals.

Statement 2: In alkali metals I.P. decreases down the group.

View answer and explanation

Correct option: B

Statement 1 is false but statement 2 is true

Option B (Statement 1 is false but statement 2 is true) is correct because Lithium is the strongest reducing agent in aqueous solution due to its high hydration energy, and ionization energy decreases down the group.

47 Hard

47 of 303

Analyzing +4 | -1

Two metals ‘x’ and ‘y’ belong to the same group of S – block. ‘x’ forms a soluble sulphate but insoluble oxide, ‘y’ forms soluble oxide but insoluble sulphate x and y are respectively

View answer and explanation

Correct option: A

Mg and Ba

Option A (Mg and Ba) is correct because Magnesium sulfate (

MgS{O_4}

) is soluble, while Barium oxide is soluble. Barium sulfate (

BaS{O_4}

) is insoluble, while Magnesium oxide is insoluble.

48 Medium

48 of 303

Analyzing +4 | -1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : LiF is sparingly soluble in water.
Reason R : The ionic radius of

L{i^ + }

ion is smallest
among its group members, hence has least
hydration enthalpy.
In the light of the above statements, choose the
most appropriate answer from the options given
below.

View answer and explanation

Correct option: C

A is true but R is false.

Option C (A is true but R is false) is correct because LiF is sparingly soluble due to high lattice enthalpy, and

Li^+

has high hydration enthalpy due to its small size.

49 Medium

49 of 303

Understanding +4 | -1

The compound insoluble in acetic acid is:

View answer and explanation

Correct option: D

Calcium oxalate

Option D (Calcium oxalate) is correct because calcium oxalate is known to be insoluble in acetic acid.

50 Medium

50 of 303

Understanding +4 | -1

A{l_2}\,{O_3}\,

was leached with alkali to get

X.

the solution of

X

on passing of gas

Y,

forms

Z.

X,\,\,Y

and

Z

respectively are

View answer and explanation

Correct option: D

X = Na\left[ {Al{{\left( {OH} \right)}_4}} \right],Y = C{O_2},\,\,\,\,Z = A{l_2}{O_3} \cdot x{H_2}O\,\,

Option D (

X = Na[Al(OH)_4], Y = CO_2, Z = Al_2O_3 \cdot xH_2O

) is correct because aluminum oxide reacts with alkali to form sodium aluminate, which then reacts with carbon dioxide to form hydrated aluminum oxide.

51 Medium

51 of 303

Understanding +4 | -1

Calgon is used for water treatment. Which of the following statement is not true about Calgon?

View answer and explanation

Correct option: A

Calgon contains the 2nd most abundant element by weight in the Earth’s crust.

Option A is the correct answer because Calgon is a compound, not an element, and therefore cannot *contain* the 2nd most abundant element. The 2nd most abundant element in Earth's crust is Silicon.

52 Medium

52 of 303

Analyzing +4 | -1

Assertion (A): Group 1 elements are the largest in their horizontal periods in the periodic table (exclude noble gases).

Reason (R): The melting and boiling points of group 1 elements increases on moving down from

Li

Cs

View answer and explanation

Correct option: C

Assertion (A) is true, and Reason (R) is false.

Option C (Assertion (A) is true, and Reason (R) is false) is correct because Group 1 elements are indeed the largest in their respective periods (excluding noble gases), but the melting and boiling points of Group 1 elements decrease, not increase, down the group from Li to Cs.

53 Easy

53 of 303

Understanding +4 | -1

B\xleftarrow[\Delta ]{{478\,\,K}}\,\,CaS{O_4}\,.\,\,2{H_2}O\xrightarrow[\Delta ]{{390\,\,K}}A

A and B are respectively

View answer and explanation

Correct option: A

Plaster of paris, dead burnt plaster

Option A is correct because CaSO4.2H2O heated at 390K gives Plaster of Paris (A), and further heating at 478K gives dead burnt plaster (B).

54 Medium

54 of 303

Analyzing +4 | -1

Which of the following is not the correct order of property indicated?

View answer and explanation

Correct option: C

LiOH > NaOH > KOH > RbOH > CSOH

(Solubility)

Option B (Both assertion and reason are true but reason is not the correct explanation of assertion) is correct because both statements are factually correct, but the reason doesn't explain the assertion.

55 Easy

55 of 303

Analyzing +4 | -1

Which of the following properties of lithium does not show diagonal relationship with magnesium?

View answer and explanation

Correct option: A

Formation of

\mathrm{L}{\mathrm{i}^ + }

ion

The correct answer is A (Formation of

\mathrm{L}{\mathrm{i}^ + }

ion) because the formation of M+ ion is a general property of alkali metals and not specific to the diagonal relationship between Lithium and Magnesium.

56 Medium

56 of 303

Understanding +4 | -1

{{Be}({OH})}_2

dissolves in excess of

{NaOH}

{{Be}({OH})}_2

is an amphoteric compound.

View answer and explanation

Correct option: B

Both A and R are true but R is not a correct explanation of A

Option B is correct because both the assertion and reason are true, but the reason doesn't fully explain why

{{Be}({OH})}_2

dissolves in excess NaOH; the formation of a complex ion is the primary reason.

57 Easy

57 of 303

Understanding +4 | -1

Magnesium has polarising power closer to that of:

View answer and explanation

Correct option: A

\mathrm{Li}

Option A (Li) is correct because Lithium and Magnesium exhibit a diagonal relationship, resulting in similar polarizing power.

58 Medium

58 of 303

Analyzing +4 | -1

Assertion (A) : Ether can extract

{LiCl}

from the aqueous solution of a mixture of

{LiCl}, {NaCl}

and

{KCl}

.

Reason (R): Hydration of

{Li}^{+}

ion is greater than that of

{Na}^{+}

and

{K}^{+}

ions.

View answer and explanation

Correct option: B

Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

Option B is correct because both the assertion and reason are true, but the reason does not explain the assertion. LiCl is soluble in ether due to its covalent character, while the hydration energies are a separate property.

59 Easy

59 of 303

Remembering +4 | -1

Solvay process is used for the manufacture of

View answer and explanation

Correct option: B

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

Option B (

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

) is correct because the Solvay process is specifically used for the industrial production of sodium carbonate (

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

60 Easy

60 of 303

Remembering +4 | -1

Which of the following compound is superoxide :-

View answer and explanation

Correct option: A

\mathrm{KO}_2

Option A (

\mathrm{KO}_2

) is correct because potassium superoxide contains the superoxide ion (

\mathrm{O}_2^{\Theta}

Revision notes and key takeaways

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