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

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

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

${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3} \cdot 7{{\rm{H}}_2}{\rm{O}}$

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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 61-90 of 137 questions

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61 Easy

61 of 137

Analyzing +4 | -1

Which substance gives a different flame colouration from the others?

View answer and explanation

Correct option: D

Table salt

Option D (Table salt) is correct because table salt is NaCl, which gives a yellow flame, while the others are potassium salts, which give a lilac flame.

62 Easy

62 of 137

Remembering +4 | -1

Bleaching powder is obtained by treating chlorine with

View answer and explanation

Correct option: B

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

Option B (Ca(OH)2) is correct because bleaching powder is produced by reacting chlorine gas with calcium hydroxide (slaked lime).

63 Easy

63 of 137

Understanding +4 | -1

The cation which forms a yellow precipitate with potassium chromate in acetic acid is:

View answer and explanation

Correct option: B

\mathrm{B}{\mathrm{a}^{2 + }}

Option B (

\mathrm{B}{\mathrm{a}^{2 + }}

) is correct because

\mathrm{BaCr}{\mathrm{O}_4}

is a yellow solid that is insoluble in acetic acid.

64 Easy

64 of 137

Remembering +4 | -1

Causticisation process is used for the preparation of:

View answer and explanation

Correct option: A

Caustic soda

Option A (Caustic soda) is correct because the causticization process is used to produce sodium hydroxide (caustic soda) from sodium carbonate.

65 Easy

65 of 137

Understanding +4 | -1

Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?

View answer and explanation

Correct option: A

Li

Option A (

Li

) is correct because lithium reacts least vigorously with water among alkali metals due to its small size and high ionization enthalpy.

66 Easy

66 of 137

Remembering +4 | -1

The only element which is radioactive among alkali metals is:

View answer and explanation

Correct option: B

\mathrm{Fr}

Option B (Fr) is correct because Francium is the only radioactive alkali metal.

67 Easy

67 of 137

Understanding +4 | -1

Which metal dissolves in

\mathrm{NaOH}

with the evolution of

{\mathrm{H}_2}

View answer and explanation

Correct option: A

\mathrm{Be}

Option A (Be) is correct because beryllium reacts with NaOH to produce sodium beryllate and hydrogen gas.

68 Easy

68 of 137

Understanding +4 | -1

Which of the following hydride conducts electricity in molten state

View answer and explanation

Correct option: D

Option D (KH) is correct because KH is an ionic hydride, and in the molten state, it dissociates into ions (

K^+

and

H^-

) which conduct electricity.

69 Easy

69 of 137

Understanding +4 | -1

Which of the following metal carbonates decomposes on heating?

View answer and explanation

Correct option: A

\mathrm{MgC}{\mathrm{O}_3}

Option A (

\mathrm{MgC}{\mathrm{O}_3}

) is correct because magnesium carbonate decomposes upon heating, releasing carbon dioxide.

70 Easy

70 of 137

Remembering +4 | -1

The carbonate of which of the following cation is insoluble in water?

View answer and explanation

Correct option: D

\mathrm{Ca}^{2+}

Option D (

\mathrm{Ca}^{2+}

) is correct because carbonates of alkali metals and ammonium are soluble, while most other carbonates, including calcium carbonate, are insoluble.

71 Easy

71 of 137

Understanding +4 | -1

Salt having maximum lattice energy among the following is

View answer and explanation

Correct option: A

\mathrm{LiF}

Option A (

\mathrm{LiF}

) is correct because lattice energy is inversely proportional to the size of the ions, and LiF has the smallest ions among the given options.

72 Easy

72 of 137

Understanding +4 | -1

Magnesium has polarizing power closer to that of:

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Correct option: A

Lithium

Option A (Lithium) is correct because Magnesium and Lithium exhibit a diagonal relationship due to similar charge/size ratio.

73 Easy

73 of 137

Understanding +4 | -1

Setting of plaster of Paris is

View answer and explanation

Correct option: D

Hydration to yield another hydrate

Option D is correct because the setting of plaster of Paris involves hydration to form gypsum, another hydrate.

74 Easy

74 of 137

Remembering +4 | -1

The main constituent of egg-shells is:

View answer and explanation

Correct option: A

\mathrm{CaC}{\mathrm{O}_3}

Option A (

\mathrm{CaC}{\mathrm{O}_3}

) is correct because eggshells are primarily composed of calcium carbonate.

75 Easy

75 of 137

Remembering +4 | -1

Chlorophyll contains:

View answer and explanation

Correct option: C

Option C (Mg) is correct because chlorophyll contains a magnesium (Mg) ion at its center, which is essential for its function in photosynthesis.

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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

76 Easy

76 of 137

Analyzing +4 | -1

Which can undergo both oxidation and reduction?

View answer and explanation

Correct option: C

\mathrm{B}{\mathrm{a}^ + }

The correct answer is C (

\mathrm{B}{\mathrm{a}^ + }

) because it can either gain an electron to become Ba (reduction) or lose an electron to become Ba²⁺ (oxidation).

77 Easy

77 of 137

Remembering +4 | -1

Li, Na among alkali metals show properties of:

View answer and explanation

Correct option: D

Representative elements

Option D (Representative elements) is correct because alkali metals like Li and Na belong to the s-block, which are representative elements.

78 Easy

78 of 137

Remembering +4 | -1

An alloy of

\mathrm{Na} + \mathrm{K}

is:

View answer and explanation

Correct option: C

Both (1) and (2)

Option C (Both (1) and (2)) is correct because Na-K alloy is liquid at room temperature and is used in specially designed thermometers.

79 Easy

79 of 137

Remembering +4 | -1

Which compound is used in photography?

View answer and explanation

Correct option: D

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

Option D (

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

) is correct because sodium thiosulphate (

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

), also known as hypo, is used as a fixing agent in photography to remove unexposed silver halide crystals.

80 Easy

80 of 137

Understanding +4 | -1

Which is more basic in character?

View answer and explanation

Correct option: A

RbOH

Option A (RbOH) is correct because basic character increases down the group in alkali metal hydroxides due to decreasing ionization energy.

81 Easy

81 of 137

Remembering +4 | -1

The metal that forms nitride by reacting directly with

{N_2}

of air, is

View answer and explanation

Correct option: D

Li

Option D (

Li

) is correct because lithium is the only alkali metal that directly reacts with nitrogen to form a stable nitride.

82 Easy

82 of 137

Analyzing +4 | -1

Which of the following statement is incorrect ?

View answer and explanation

Correct option: C

Metallic character of alkali metals, decreases down the group

Option A (2) is correct because pent-3-en-2-ol has one chiral carbon, so it has 2 optical isomers.

83 Easy

83 of 137

Remembering +4 | -1

Excess of

N{a^ + }

ions in our system causes

View answer and explanation

Correct option: A

High BP

Option A (High BP) is correct because excess sodium (

N{a^ + }

) ions in the body can lead to high blood pressure (hypertension).

84 Easy

84 of 137

Understanding +4 | -1

Which metal does not form ionic hydride?

View answer and explanation

Correct option: B

\mathrm{Mg}

Option B (

\mathrm{Mg}

) is correct because magnesium forms polymeric hydrides, not ionic hydrides.

85 Easy

85 of 137

Remembering +4 | -1

Which one of the following salts does not impart colour to the flame?

View answer and explanation

Correct option: D

\mathrm{MgCl}_2

Option D (

\mathrm{MgCl}_2

) is correct because magnesium and beryllium have high ionization energies due to their small size, preventing them from being easily excited in a flame.

86 Easy

86 of 137

Remembering +4 | -1

Which metal sulphate is readily soluble in water?

View answer and explanation

Correct option: A

{BeSO}_4

Option A (

{BeSO}_4

) is correct because beryllium sulfate is readily soluble in water due to the small size and high charge density of the beryllium ion, leading to high hydration energy.

87 Easy

87 of 137

Remembering +4 | -1

Washing soda has the formula

View answer and explanation

Correct option: D

N{a_2}C{O_3}.10{H_2}O

Option D (

N{a_2}C{O_3}.10{H_2}O

) is correct because washing soda is sodium carbonate decahydrate,

N{a_2}C{O_3}.10{H_2}O

88 Easy

88 of 137

Remembering +4 | -1

Alkali metals used in photoelectric cells

View answer and explanation

Correct option: D

K,\,\,\,Cs

Option D (

K,\,\,Cs

) is correct because Potassium (K) and Cesium (Cs) have relatively low ionization energies and are commonly used in photoelectric cells.

89 Easy

89 of 137

Analyzing +4 | -1

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

and

\mathrm{NaHC}{\mathrm{O}_3}

may be distinguished by treating their aqueous solution with:

View answer and explanation

Correct option: D

\mathrm{MgS}{\mathrm{O}_4}

Option D (

\mathrm{MgS}{\mathrm{O}_4}

) is correct because

Na_2CO_3

reacts with

MgSO_4

to form a precipitate of magnesium carbonate, while

NaHCO_3

does not.

90 Easy

90 of 137

Remembering +4 | -1

Washing soda is:

View answer and explanation

Correct option: D

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3} \cdot 10{\mathrm{H}_2}\mathrm{O}

Option D (

\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3} \cdot 10{\mathrm{H}_2}\mathrm{O}

) is correct because washing soda is sodium carbonate decahydrate.

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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