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

${\rm{NaHC}}{{\rm{O}}_3} + {\rm{CoS}}$

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

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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 91-120 of 137 questions

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91 Easy

91 of 137

Remembering +4 | -1

Which alkali metal bicarbonates does not exist as solid?

View answer and explanation

Correct option: A

\mathrm{LiHC}{\mathrm{O}_3}

Option A (

\mathrm{LiHCO_3}

) is correct because lithium bicarbonate (

\mathrm{LiHCO_3}

) is unstable in solid form and exists only in solution.

92 Easy

92 of 137

Remembering +4 | -1

Commonly used laboratory desiccant is:

View answer and explanation

Correct option: A

Calcium chloride

Option A (Calcium chloride) is correct because calcium chloride is a hygroscopic substance commonly used as a desiccant in laboratories.

93 Easy

93 of 137

Remembering +4 | -1

The metal present in Grignard reagent is:

View answer and explanation

Correct option: B

\mathrm{Mg}

Option B (

\mathrm{Mg}

) is correct because magnesium is the metal present in Grignard reagents, which have the general formula R-Mg-X.

94 Easy

94 of 137

Remembering +4 | -1

The correct composition of plaster of Paris is

View answer and explanation

Correct option: B

\mathrm{CaSO}_4 \cdot \frac{1}{2} \mathrm{H}_2 \mathrm{O}

Option B (

\mathrm{CaSO}_4 \cdot \frac{1}{2} \mathrm{H}_2 \mathrm{O}

) is correct because plaster of Paris is the hemihydrate form of calcium sulfate.

95 Easy

95 of 137

Remembering +4 | -1

Which of the following salt does not impart colour to the flame

View answer and explanation

Correct option: A

MgC{l_2}

Option A (

MgC{l_2}

) is correct because magnesium ions (

Mg^{2+}

) do not impart any characteristic color to the flame during a flame test due to their high ionization energy.

96 Easy

96 of 137

Remembering +4 | -1

When washing soda is heated

View answer and explanation

Correct option: D

Water vapour is released

Option D (Water vapour is released) is correct because when washing soda is heated, it loses its water of crystallization.

97 Easy

97 of 137

Remembering +4 | -1

The ashes of plants contain alkali metals, 90% of which is:

View answer and explanation

Correct option: B

\mathrm{K}

Option B (

\mathrm{K}

) is correct because potassium is the most abundant alkali metal found in plant ashes, typically accounting for about 90% of the total alkali metal content.

98 Easy

98 of 137

Remembering +4 | -1

Most abundant salt of sodium in nature is:

View answer and explanation

Correct option: D

\mathrm{NaCl}

Option D (

\mathrm{NaCl}

) is correct because sodium chloride (

\mathrm{NaCl}

), or common salt, is the most abundant sodium salt found in nature, particularly in seawater and salt deposits.

99 Easy

99 of 137

Remembering +4 | -1

Sodium carbonate contains:

View answer and explanation

Correct option: B

10 molecules of crystalline water

Option B (10 molecules of crystalline water) is correct because sodium carbonate exists as a decahydrate, Na2CO3·10H2O.

100 Easy

100 of 137

Analyzing +4 | -1

Given below are two statements, one is labelled as
Assertion A and the other is labelled as Reason R.

Assertion A : Beryllium has less negative value of
reduction potential compared to the other alkaline
earth metals.

Reason R: Beryllium has large hydration energy
due to small size of

{Be}^{2+}

but relatively large value
of atomization 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

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

Option C (Both A and R are correct and R is the correct explanation of A) is correct because Beryllium's less negative reduction potential is due to its high atomization and ionization enthalpies, coupled with a large hydration energy.

101 Easy

101 of 137

Remembering +4 | -1

Which of the compounds of cement sets at the slowest rate?

View answer and explanation

Correct option: A

Dicalcium silicate

Option A (Dicalcium silicate) is correct because dicalcium silicate (

C_2S

) hydrates and hardens slowly, contributing to the long-term strength of cement.

102 Easy

102 of 137

Understanding +4 | -1

When ammoniacal solution of common salt is saturated with carbon dioxide, we get:

View answer and explanation

Correct option: C

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

Option C is correct because when carbon dioxide is passed through an ammoniacal solution of common salt, sodium bicarbonate (NaHCO3) is formed.

103 Easy

103 of 137

Understanding +4 | -1

The ease of adsorption of the hydrates alkali metal ions on an ion-exchange resins follows the order:

View answer and explanation

Correct option: D

\mathrm{R}{\mathrm{b}^ + } < {\mathrm{K}^ + } < N{\mathrm{a}^ + } < L{\mathrm{i}^ + }

Option D (

\mathrm{R}{\mathrm{b}^ + } < {\mathrm{K}^ + } < N{\mathrm{a}^ + } < L{\mathrm{i}^ + }

) is correct because smaller hydrated ionic size leads to greater ease of adsorption on ion-exchange resins.

104 Easy

104 of 137

Analyzing +4 | -1

Assertion (A) :

\mathrm{KO}_2

is paramagnetic.

Reason (R) :

\mathrm{K}^{+}

ion has unpaired electron.

View answer and explanation

Correct option: C

\mathbf{A}

is true but

\mathbf{R}

is false.

The correct answer is C because KO2 is paramagnetic due to the presence of an unpaired electron in the superoxide ion (O2-), but K+ ion does not have unpaired electrons.

105 Easy

105 of 137

Understanding +4 | -1

A gas reacts with

\mathrm{CaO}

and not with

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

is:

View answer and explanation

Correct option: A

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

Option A (

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

) is correct because carbon dioxide reacts with calcium oxide to form calcium carbonate but does not react with sodium bicarbonate.

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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

106 Easy

106 of 137

Understanding +4 | -1

The order of melting point is

View answer and explanation

Correct option: C

NaCl\mathrm{ } > KCl\mathrm{ } > CsCl\mathrm{ } > LiCl

Option C is correct. The melting point generally decreases down the group due to decreasing lattice energy, but LiCl has a lower melting point due to its covalent character. NaCl has the highest melting point among the given options.

107 Easy

107 of 137

Remembering +4 | -1

In India, at the occasion of marriages, the fireworks used give green flame. Which one of the following radicals may be present?

View answer and explanation

Correct option: C

\mathrm{Ba}

Option C (

\mathrm{Ba}

) is correct because Barium compounds emit a characteristic green color when heated in a flame, which is used in fireworks.

108 Easy

108 of 137

Analyzing +4 | -1

The decreasing order of second ionization energy of K, Ca and Ba is:

View answer and explanation

Correct option: C

\mathrm{K} > Ca > Ba

Option C (

\mathrm{K} > Ca > Ba

) is correct because the second ionization energy depends on the effective nuclear charge and electronic configuration.

109 Easy

109 of 137

Remembering +4 | -1

Soda ash is chemically:

View answer and explanation

Correct option: D

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

(anhydrous)

Option D (

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

(anhydrous)) is correct because soda ash is the anhydrous form of sodium carbonate.

110 Easy

110 of 137

Remembering +4 | -1

Metallic magnesium is prepared by

View answer and explanation

Correct option: D

electrolysis of molten

\mathrm{MgCl}_2

Option D (electrolysis of molten

\mathrm{MgCl}_2

) is correct because metallic magnesium is produced by the electrolytic reduction of magnesium ions from molten magnesium chloride.

111 Easy

111 of 137

Remembering +4 | -1

The reaction of water with sodium and potassium is:

View answer and explanation

Correct option: C

Exothermic

Option C (Exothermic) is correct because the reaction of water with sodium and potassium releases heat.

112 Easy

112 of 137

Remembering +4 | -1

Siedlitz powder contains:

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because Siedlitz powder is a laxative preparation that contains sodium bicarbonate (

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

), potassium sodium tartrate, and citric acid.

113 Easy

113 of 137

Understanding +4 | -1

Which compound strongly absorb

{CO}_2

View answer and explanation

Correct option: B

{K}_2 {O}

Option B (

{K}_2 {O}

) is correct because

{CO}_2

is acidic and reacts strongly with basic oxides like

{K}_2 {O}

114 Easy

114 of 137

Remembering +4 | -1

Barium burns in air to form

View answer and explanation

Correct option: D

\mathrm{BaO}

Option D (

\mathrm{BaO}

) is correct because Barium (Ba) burns in air to form barium oxide (

\mathrm{BaO}

115 Easy

115 of 137

Understanding +4 | -1

Which of the following alkali metal ions has lowest ionic mobility in aqueous solution

View answer and explanation

Correct option: C

\mathrm{Li}^{+}

Option C (

\mathrm{Li}^{+}

) is correct because among the alkali metal ions, lithium ion has the smallest size and is most heavily hydrated, leading to the lowest ionic mobility in aqueous solution.

116 Easy

116 of 137

Remembering +4 | -1

Which alkaline earth metal forms complex salts?

View answer and explanation

Correct option: A

\mathrm{Be}

Option A (

\mathrm{Be}

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

117 Easy

117 of 137

Remembering +4 | -1

Black ash is:

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because black ash is a mixture primarily composed of sodium carbonate and calcium sulfide, produced during the Leblanc process.

118 Easy

118 of 137

Analyzing +4 | -1

Assertion (A) :

\mathrm{Li}

is used in photocells.

Reason (R) :

Cs

has lower ionisation energy than

\mathrm{Li}

View answer and explanation

Correct option: D

\mathbf{A}

is false but

\mathbf{R}

is true.

Option D (A is false but R is true.) is correct because Li is not used in photocells, but Cs has a lower ionization energy than Li.

119 Easy

119 of 137

Analyzing +4 | -1

A white solid reacts with dil.

\mathrm{HCl}

to give colourless gas that decolourises aqueous bromine. The solid is most likely to be:

View answer and explanation

Correct option: D

Sodium thiosulphate

The correct answer is D (Sodium thiosulphate) because it reacts with dilute HCl to produce SO₂, which decolorizes bromine water.

120 Easy

120 of 137

Understanding +4 | -1

The element with atomic number 56 belongs to

View answer and explanation

Correct option: A

s-Block element

Option A (s-Block element) is correct because the element with atomic number 56 is Barium (Ba), which belongs to Group 2 (alkaline earth metals) and is an s-block element.

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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