Conc. Solution of ${\rm{NaCl}}$

Conc. Solution of ${\rm{N}}{{\rm{a}}_2}{\rm{C}}{{\rm{O}}_3}$

Conc. Solution of ${\rm{N}}{{\rm{a}}_2}{\rm{S}}{{\rm{O}}_4}$

${\rm{NaHC}}{{\rm{O}}_3} \cdot 6{{\rm{H}}_2}{\rm{O}}$

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

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

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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 121-137 of 137 questions

121 Easy

121 of 137

Understanding +4 | -1

Assertion (A):

{Li}^{+}

forms series of trihydrates

{LiX} \cdot 3 {H}_2 {O}\left[X={Cl}, {Br}, {I}, {ClO}_2, {ClO}_4, {MnO}_4, {NO}_3, {BF}_4\right)

Reason (R) : This is due to its smaller size

\left({Li}^{+}\right)

and highest ion dipole interaction.

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 is correct because both the assertion and reason are true, and the reason correctly explains why Lithium forms trihydrates due to its small size and high ion-dipole interaction.

122 Easy

122 of 137

Remembering +4 | -1

Which of the following metals can be extracted through alkali leaching technique?

View answer and explanation

Correct option: A

\mathrm{Sn}

Option A (

\mathrm{Sn}

) is correct because tin (

\mathrm{Sn}

) can be extracted using alkali leaching, where it reacts with sodium hydroxide to form a soluble stannate complex.

123 Easy

123 of 137

Remembering +4 | -1

Metallic hydride among the following is

View answer and explanation

Correct option: C

CrH

Option C (CrH) is correct because metallic hydrides are formed by d-block and f-block elements, and Cr (Chromium) is a d-block element.

124 Easy

124 of 137

Analyzing +4 | -1

A sudden large jump between the values of second and third ionization energies of an element would be associated with the electronic configuration:

View answer and explanation

Correct option: D

1{s^2},2{s^2}2{p^6},3{s^2}

Option D (

1{s^2},2{s^2}2{p^6},3{s^2}

) is correct because removing the third electron requires significantly more energy as it involves removing an electron from a stable, completely filled noble gas configuration.

125 Easy

125 of 137

Remembering +4 | -1

The alkali metal that reacts with nitrogen directly to form nitride is

View answer and explanation

Correct option: A

Li

Option A (

Li

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

126 Easy

126 of 137

Understanding +4 | -1

Assertion (A) : Lime water turns milky when the gas liberated from an acidified carbonate solution is passed into it.

Reason (R): The liberated

\mathrm{CO}_2

reacts with lime water to give calcium bicarbonate as the precipitate.

View answer and explanation

Correct option: C

\mathbf{A}

is true but

\mathbf{R}

is false.

Option C (

\mathbf{A}

is true but

\mathbf{R}

is false) is correct because while lime water does turn milky with CO2, the product is calcium carbonate, not calcium bicarbonate.

127 Easy

127 of 137

Understanding +4 | -1

Which of the following cations cannot be
detected by the flame test?

View answer and explanation

Correct option: D

Mg^{2+}

Option D (

Mg^{2+}

) is correct because magnesium ions do not impart color to the flame in a flame test.

128 Easy

128 of 137

Remembering +4 | -1

Element found in plant systems which forms an important constituent of photosynthesis is:

View answer and explanation

Correct option: D

\mathrm{Mg}

Option D (

\mathrm{Mg}

) is correct because magnesium is a central component of chlorophyll, which is essential for photosynthesis.

129 Easy

129 of 137

Remembering +4 | -1

Brine is chemically:

View answer and explanation

Correct option: C

Conc. Solution of

\mathrm{NaCl}

Option C (Conc. Solution of

\mathrm{NaCl}

) is correct because brine is defined as a concentrated solution of sodium chloride (NaCl).

130 Easy

130 of 137

Remembering +4 | -1

The wire of flash bulbs are made up of:

View answer and explanation

Correct option: A

\mathrm{Mg}

Option A (

\mathrm{Mg}

) is correct because Magnesium (Mg) wire is used in flash bulbs due to its ability to burn brightly.

131 Easy

131 of 137

Remembering +4 | -1

Which of the following is known as fusion mixture

View answer and explanation

Correct option: C

Mixture of

{K_2}C{O_3}\, + N{a_2}C{O_3}

Option C (Mixture of

\mathrm{K_2CO_3} + \mathrm{Na_2CO_3}

) is correct because a fusion mixture is defined as a mixture of potassium carbonate and sodium carbonate.

132 Easy

132 of 137

Remembering +4 | -1

Flash bulbs contain wire or foil of Mg packed in an atmosphere of:

View answer and explanation

Correct option: B

{\mathrm{O}_2}

Option B (

{\mathrm{O}_2}

) is correct because magnesium reacts vigorously with oxygen to produce light in flash bulbs.

133 Easy

133 of 137

Understanding +4 | -1

The most basic oxide among the following is:

View answer and explanation

Correct option: A

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

Option A (

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

) is correct because oxides of alkali metals are generally more basic than oxides of alkaline earth metals, metalloids, or amphoteric oxides.

134 Easy

134 of 137

Remembering +4 | -1

Baking soda is:

View answer and explanation

Correct option: A

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

Option A (

\mathrm{NaHCO_3}

) is correct because baking soda is the common name for sodium bicarbonate, which has the chemical formula

\mathrm{NaHCO_3}

135 Easy

135 of 137

Remembering +4 | -1

The alkali metal which forms only the monoxide is

View answer and explanation

Correct option: D

\mathrm{Li}

Option D (Li) is correct because Lithium (Li) is the only alkali metal that primarily forms the monoxide (

\mathrm{Li}_2\mathrm{O}

) due to its small size and high polarizing power.

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136 Easy

136 of 137

Remembering +4 | -1

The metal that gives mainly a monoxide when heated in excess of

{O_2}

View answer and explanation

Correct option: D

Li

Option D (

Li

) is correct because lithium reacts with oxygen to form mainly lithium monoxide (

Li_2O

137 Easy

137 of 137

Remembering +4 | -1

In Down’s method for the extraction of sodium, the melting point of the electrolyte is lowered by adding

View answer and explanation

Correct option: C

Both calcium chloride and potassium fluoride

Option C (Both calcium chloride and potassium fluoride) is correct because the addition of both

CaCl_2

and KF lowers the melting point of NaCl in Down's process.

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