${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}.5{{\rm{H}}_2}{\rm{O}}$

${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3} \cdot 2{{\rm{H}}_2}{\rm{O}}$

${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}.3{{\rm{H}}_2}{\rm{O}}$

${\rm{N}}{{\rm{a}}_2}{{\rm{S}}_2}{{\rm{O}}_3}.4{{\rm{H}}_2}{\rm{O}}$

${\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}.10{{\rm{H}}_2}{\rm{O}}$

${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}.10{{\rm{H}}_2}{\rm{O}}$

${\rm{MgS}}{{\rm{O}}_4}.7{{\rm{H}}_2}{\rm{O}}$

${\rm{CaS}}{{\rm{O}}_4}.5{{\rm{H}}_2}{\rm{O}}$

${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}$

Anhydrous ${\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}$

Anhydrous ${\rm{CuS}}{{\rm{O}}_4}$

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

${\rm{Ca}}\left( {{{\rm{C}}_2}{{\rm{O}}_4}} \right)$

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JEE • CHEMISTRY • S-BLOCK ELEMENTS

S-block elements practice · Easy

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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 137 questions

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31 Easy

31 of 137

Remembering +4 | -1

Hypo is chemically:

View answer and explanation

Correct option: D

\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}.5{\mathrm{H}_2}\mathrm{O}

Option D (

\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}.5{\mathrm{H}_2}\mathrm{O}

) is correct because it is the chemical formula for sodium thiosulfate pentahydrate, commonly known as hypo.

32 Easy

32 of 137

Analyzing +4 | -1

Assertion : Order of lattice energy for same halides are as

\operatorname{LiX}>{NaX}>{KX}

.

Reason : Size of alkaline - earth metal increases from

{Li}

K

View answer and explanation

Correct option: C

If assertion is true but reason is false.

Option C is correct because the assertion is true (lattice energy order is LiX > NaX > KX), but the reason is false (Li, Na, and K are alkali metals, not alkaline earth metals).

33 Easy

33 of 137

Remembering +4 | -1

The alkali metal which acts as a nutrient for plants is:

View answer and explanation

Correct option: B

Option B (K) is correct because potassium is an essential macronutrient for plants, playing a vital role in various physiological processes.

34 Easy

34 of 137

Remembering +4 | -1

On heating washing soda, we get:

View answer and explanation

Correct option: D

{\mathrm{H}_2}\mathrm{O}\left( v \right)

Option D (

{\mathrm{H}_2}\mathrm{O}\left( v \right)

) is correct because heating washing soda leads to the loss of water molecules in the form of vapor.

35 Easy

35 of 137

Remembering +4 | -1

Which alkaline earth metal nitride is volatile?

View answer and explanation

Correct option: A

\mathrm{B}{\mathrm{e}_3}{\mathrm{N}_2}

Option A (Be3N2) is correct because Beryllium nitride (Be3N2) is known to be volatile, unlike other alkaline earth metal nitrides.

36 Easy

36 of 137

Remembering +4 | -1

Oxone is name given to:

View answer and explanation

Correct option: B

Sodium peroxide

Option B is correct because Oxone is a trade name for a mixture containing sodium peroxide (Na2O2).

37 Easy

37 of 137

Remembering +4 | -1

The element playing significant role in neuromuscular function and interneuronal transmission is

View answer and explanation

Correct option: C

Ca

Option C (

Ca

) is correct because Calcium ions play a crucial role in neuromuscular function and interneuronal transmission.

38 Easy

38 of 137

Understanding +4 | -1

Which property of sodium is being used in street lights.

View answer and explanation

Correct option: C

Sodium atoms emits photons in yellow region of visible spectrum, due to electrically stimulated transitions.

Option C is correct because sodium atoms emit photons in the yellow region of the visible spectrum due to electrically stimulated transitions, which is why they are used in street lights.

39 Easy

39 of 137

Understanding +4 | -1

The compound which is insoluble in hot water and

\mathrm{N}{\mathrm{H}_3}

is:

View answer and explanation

Correct option: C

\mathrm{BaS}{\mathrm{O}_4}

Option C is correct because BaSO4 is insoluble in both hot water and NH3 due to its high lattice energy and strong ionic bonding.

40 Easy

40 of 137

Analyzing +4 | -1

The gas evolved on heating

\mathrm{CaF}_2

and

\mathrm{SiO}_2

with concentrated

\mathrm{H}_2 \mathrm{SO}_4

, on hydrolysis gives a white gelatinous precipitate. The precipitate is

View answer and explanation

Correct option: D

Calciumfluorosilicate

The correct answer is Calciumfluorosilicate because the gas evolved, silicon tetrafluoride, hydrolyzes to form calcium hexafluorosilicate in the presence of calcium ions.

41 Easy

41 of 137

Understanding +4 | -1

Which of the following reaction is correct?

View answer and explanation

Correct option: D

4 \mathrm{LiNO}_3 \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Li}_2 \mathrm{O}+4 \mathrm{NO}_2+\mathrm{O}_2

Option D (

4 \mathrm{LiNO}_3 \stackrel{\Delta}{\longrightarrow} 2 \mathrm{Li}_2 \mathrm{O}+4 \mathrm{NO}_2+\mathrm{O}_2

) is correct because lithium nitrate decomposes upon heating to form lithium oxide, nitrogen dioxide, and oxygen.

42 Easy

42 of 137

Understanding +4 | -1

How

N{H_3}

is recovered in Solvay process?

View answer and explanation

Correct option: A

By reaction of

N{H_4}Cl

and

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

Option A (By reaction of

N{H_4}Cl

and

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

) is correct because this reaction is used to regenerate ammonia in the Solvay process.

43 Easy

43 of 137

Understanding +4 | -1

The aqueous solution of Lithium salts are poor conductors of electricity rather than other alkali metals because of

View answer and explanation

Correct option: D

Higher degree of hydration of

L{i^ + }

ions

Option D (Higher degree of hydration of

L{i^ + }

ions) is correct because the small size of

L{i^ + }

leads to high charge density and extensive hydration, hindering ion mobility and reducing conductivity.

44 Easy

44 of 137

Analyzing +4 | -1

Identify the incorrect statement from the following

View answer and explanation

Correct option: C

The oxidation number of K in

K{O_2}

is + 4

Option C is correct because the reaction is second order, and the half-life is approximately 2 days based on the given data.

45 Easy

45 of 137

Understanding +4 | -1

Which among the following elements has the tendency to form covalent compounds.

View answer and explanation

Correct option: B

Be

Option B (

Be

) is correct because beryllium, due to its small size and high charge density, has a greater tendency to form covalent compounds compared to other alkaline earth metals.

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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 Easy

46 of 137

Remembering +4 | -1

Glauber’s salt is

View answer and explanation

Correct option: B

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}.10{\mathrm{H}_2}\mathrm{O}

Option B (

\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_4}.10{\mathrm{H}_2}\mathrm{O}

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

47 Easy

47 of 137

Understanding +4 | -1

Sodium hydride

(\mathrm{NaH})

when dissolved in water produces:

View answer and explanation

Correct option: B

Basic solution

Option B (Basic solution) is correct because sodium hydride reacts with water to form sodium hydroxide, a strong base, and hydrogen gas.

48 Easy

48 of 137

Remembering +4 | -1

Soda lime is

View answer and explanation

Correct option: B

\mathrm{NaOH and CaO}

Option B (NaOH and CaO) is correct because soda lime is a mixture of sodium hydroxide (NaOH) and calcium oxide (CaO).

49 Easy

49 of 137

Analyzing +4 | -1

A: The sum of

1^{\text {st }}

and

2^{\text {nd }}

ionization energy values of an alkaline earth metal is very high, but that metal exists in

M^{+2}

cationic state only in its compounds.

R: The hydration energy of an alakline earth metal cation is more than its second ionization energy.

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 alkaline earth metals form M+2 ions due to high hydration energy compensating for the second ionization energy, making both the assertion and reason true, with the reason correctly explaining the assertion.

50 Easy

50 of 137

Remembering +4 | -1

Dead burnt is:

View answer and explanation

Correct option: A

\mathrm{CaS}{\mathrm{O}_4}

Option A (

\mathrm{CaSO}_4

) is correct because dead burnt is anhydrous calcium sulfate (

\mathrm{CaSO}_4

51 Easy

51 of 137

Analyzing +4 | -1

(X),(Y),(Z)

are elements in the third period. Oxide of

(X)

is ionic, that of

(Y)

is amphoteric, and of

(Z)

a giant molecule.

(X),(Y)

and

(Z)

will have atomic numbers in the order:

View answer and explanation

Correct option: A

(X) < (Y) < (Z)

Option B (

OF_2

) is correct because as the electronegativity of the side atom increases, the bond angle decreases.

52 Easy

52 of 137

Remembering +4 | -1

Least abundant metal in IIA group is:

View answer and explanation

Correct option: C

Option C (Ra) is correct because Radium (Ra) is radioactive and decays quickly, making it the least abundant metal in Group IIA.

53 Easy

53 of 137

Remembering +4 | -1

In the manufacture of sodium hydroxide, byproduct obtained is:

View answer and explanation

Correct option: B

\mathrm{C}{\mathrm{l}_2}

Option B (

\mathrm{C}{\mathrm{l}_2}

) is correct because in the manufacture of sodium hydroxide by electrolysis of brine, chlorine gas is produced as a byproduct at the anode.

54 Easy

54 of 137

Remembering +4 | -1

Which one of the following is a peroxide

View answer and explanation

Correct option: B

Ba{O_2}

Option B (

Ba{O_2}

) is correct because barium peroxide is a known peroxide compound.

55 Easy

55 of 137

Remembering +4 | -1

In the hardening stage of plaster of Paris, the compound formed is

View answer and explanation

Correct option: D

Monoclinic

\mathrm{CaS}{\mathrm{O}_4}.2{\mathrm{H}_2}\mathrm{O}

Option D (Monoclinic

\mathrm{CaS}{\mathrm{O}_4}.2{\mathrm{H}_2}\mathrm{O}

) is correct because Plaster of Paris hardens by absorbing water and forming monoclinic gypsum.

56 Easy

56 of 137

Remembering +4 | -1

Slaked lime is:

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because slaked lime is the common name for calcium hydroxide.

57 Easy

57 of 137

Remembering +4 | -1

The suspension of slaked lime in water is known as

View answer and explanation

Correct option: D

Milk of lime

Option D (Milk of lime) is correct because the suspension of slaked lime in water is known as milk of lime.

58 Easy

58 of 137

Remembering +4 | -1

Calcium does not combine directly with:

View answer and explanation

Correct option: D

Carbon

Option D (Carbon) is correct because Calcium does not directly combine with carbon under normal conditions to form a stable binary compound.

59 Easy

59 of 137

Remembering +4 | -1

Calcium is obtained by

View answer and explanation

Correct option: A

Electrolysis of molten

\mathrm{CaC}{\mathrm{l}_2}

Option A is correct because calcium is obtained by the electrolysis of molten calcium chloride (CaCl2), where calcium ions are reduced at the cathode to form metallic calcium.

60 Easy

60 of 137

Analyzing +4 | -1

A chloride dissolves appreciably in cold water. When placed on a platinum wire in Bunsen flame, no distinctive colour is noticed. Which one is cation?

View answer and explanation

Correct option: A

\mathrm{M}{\mathrm{g}^{2 + }}

The correct answer is A (

\mathrm{M}{\mathrm{g}^{2 + }}

) because magnesium chloride is soluble in cold water and does not impart a distinctive color to the Bunsen flame.

Revision notes and key takeaways

Review S-BLOCK ELEMENTS in your textbook or class notes, then use this set to check your understanding.

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