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

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

${\rm{Na}}\left( {{\rm{N}}{{\rm{H}}_4}} \right){\rm{HP}}{{\rm{O}}_4}$

${\rm{N}}{{\rm{a}}_4}{{\rm{P}}_2}{{\rm{O}}_7}$

${\rm{Na}}\left( {{\rm{N}}{{\rm{H}}_3}} \right){\rm{HP}}{{\rm{O}}_4}.4{{\rm{H}}_2}{\rm{O}}$

${\rm{MgN}}{{\rm{H}}_4}{\rm{P}}{{\rm{O}}_4}$

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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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121 Medium

121 of 303

Understanding +4 | -1

Thermal decomposition of which compound yields a basic and acidic oxide simultaneously?

View answer and explanation

Correct option: D

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

Option D is correct. Calcium carbonate (CaCO3) decomposes to form calcium oxide (CaO), a basic oxide, and carbon dioxide (CO2), an acidic oxide.

122 Easy

122 of 303

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.

123 Medium

123 of 303

Understanding +4 | -1

The carbonate that will not decompose on heating is

View answer and explanation

Correct option: A

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

Option A is correct because alkali metal carbonates are stable to heat except for lithium carbonate.

124 Easy

124 of 303

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.

125 Easy

125 of 303

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.

126 Easy

126 of 303

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.

127 Easy

127 of 303

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.

128 Medium

128 of 303

Understanding +4 | -1

Tin dissolves in boiling caustic soda solution because of the formation of soluble:

View answer and explanation

Correct option: C

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

Option C (

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

) is correct because tin reacts with boiling caustic soda to form sodium stannate, which is soluble.

129 Medium

129 of 303

Analyzing +4 | -1

Which of the following statements about

\mathrm{Na}_2 \mathrm{O}_2

is not correct?

View answer and explanation

Correct option: D

It is the super oxide of sodium

Option D (It is the super oxide of sodium) is not correct because

\mathrm{Na}_2 \mathrm{O}_2

is the peroxide of sodium, not the superoxide.

130 Hard

130 of 303

Remembering +4 | -1

Microcosmic salt is

View answer and explanation

Correct option: B

\mathrm{Na}\left( {\mathrm{N}{\mathrm{H}_4}} \right)\mathrm{HP}{\mathrm{O}_4}

Option B (

\mathrm{Na}\left( {\mathrm{N}{\mathrm{H}_4}} \right)\mathrm{HP}{\mathrm{O}_4}

) is the correct formula for microcosmic salt, a white crystalline solid.

131 Easy

131 of 303

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.

132 Easy

132 of 303

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.

133 Medium

133 of 303

Understanding +4 | -1

When sodium metal is dissolved in liquid ammonia, a blue solution is formed. The blue colour is due to:

View answer and explanation

Correct option: B

Solvated electrons

The correct answer is B. The blue color of the solution is due to solvated electrons, which absorb energy and impart the blue color.

134 Easy

134 of 303

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.

135 Medium

135 of 303

Remembering +4 | -1

In the wet tests for detection of various cations by precipitation,

\mathrm{Ba}^{2+}

cations are detected by obtaining precipitate of

View answer and explanation

Correct option: B

\mathrm{BaCO}_{3}

Option B (

\mathrm{BaCO}_{3}

) is correct because barium ions (

Ba^{2+}

) are typically precipitated as barium carbonate (

BaCO_3

) in qualitative analysis.

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136 Medium

136 of 303

Remembering +4 | -1

The metal, which is lighter than water at

25^{\circ} \mathrm{C}

View answer and explanation

Correct option: A

\mathrm{K}

Option A (

\mathrm{K}

) is correct because Potassium (K) is an alkali metal with a density less than that of water at

25^{\circ} \mathrm{C}

137 Easy

137 of 303

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.

138 Easy

138 of 303

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).

139 Medium

139 of 303

Understanding +4 | -1

Solution of sodium metal in liquid ammonia is good conductor of electricity due to presence of

View answer and explanation

Correct option: D

Both (1) and (3)

Option D (Both (1) and (3)) is correct because the solution contains both solvated sodium ions and solvated electrons, which contribute to its electrical conductivity.

140 Easy

140 of 303

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.

141 Medium

141 of 303

Analyzing +4 | -1

Which pair cannot exist together in solution?

View answer and explanation

Correct option: C

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

The correct answer is A (NaHCO3 and NaOH) because NaOH will react with NaHCO3 to form Na2CO3 and H2O, thus they cannot coexist in solution.

142 Easy

142 of 303

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.

143 Easy

143 of 303

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.

144 Easy

144 of 303

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.

145 Medium

145 of 303

Analyzing +4 | -1

{BeCl}_2

and

{AlCl}_3

are useful as catalysts in Friedel-Crafts reaction.

R:

{BeCl}_2

and

{AlCl}_3

provide

{Cl}^{+}

easily.

View answer and explanation

Correct option: A

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

Option A (Both A and R are true and R is the correct explanation of A) is correct because both

{BeCl}_2

and

{AlCl}_3

act as Lewis acids in Friedel-Crafts reactions by providing

{Cl}^{+}

146 Medium

146 of 303

Understanding +4 | -1

Which of the following statement is wrong for solvey process?

View answer and explanation

Correct option: D

Na_2CO_3

is partially converted into bi-carbonate.

Option D (

Na_2CO_3

is partially converted into bi-carbonate) is the wrong statement because

NaHCO_3

converts into

Na_2CO_3

mainly, and the reverse does not happen.

147 Easy

147 of 303

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.

148 Medium

148 of 303

Analyzing +4 | -1

Which of the following statement is not correct?

View answer and explanation

Correct option: D

Hydrated

{MgCl}_2

gives anhydrous

{MgCl}_2

on heating in dry air.

Option D (Hydrated

{MgCl}_2

gives anhydrous

{MgCl}_2

on heating in dry air.) is incorrect because hydrated MgCl2 on heating gives MgO, not anhydrous MgCl2.

149 Easy

149 of 303

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.

150 Medium

150 of 303

Remembering +4 | -1

When kept open in air, the crystals of washing soda lose 9 molecules of water to form a monohydrate.

N{a_2}C{O_3} \cdot 10{H_2}O\xrightarrow[{{\text{to}}\,\,{\text{air}}}]{{{\text{exposed}}}}N{a_2}C{O_3} \cdot {H_2}O + 9{H_2}O

This process is called

View answer and explanation

Correct option: A

efflorescence

Option A (efflorescence) is correct because efflorescence is the process where a hydrated salt loses water molecules to the atmosphere.

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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