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

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

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

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

${\rm{ZnS}} + {\rm{BaS}}{{\rm{O}}_4}$

${\rm{BaO}} + {\rm{ZnS}}{{\rm{O}}_4}$

${\rm{BaS}} + {\rm{ZnS}}{{\rm{O}}_4}$

${\rm{ZnO}} + {\rm{BaS}}{{\rm{O}}_4}$

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JEE • CHEMISTRY • S-BLOCK ELEMENTS

S-block elements practice · Hard

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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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1 Hard

1 of 15

Remembering +4 | -1

Barium is extracted from its ore:

View answer and explanation

Correct option: B

Witherite

Option B (Witherite) is correct because witherite is the ore of barium with the formula BaCO3.

2 Hard

2 of 15

Analyzing +4 | -1

Two metals ‘x’ and ‘y’ belong to the same group of S – block. ‘x’ forms a soluble sulphate but insoluble oxide, ‘y’ forms soluble oxide but insoluble sulphate x and y are respectively

View answer and explanation

Correct option: A

Mg and Ba

Option A (Mg and Ba) is correct because Magnesium sulfate (

MgS{O_4}

) is soluble, while Barium oxide is soluble. Barium sulfate (

BaS{O_4}

) is insoluble, while Magnesium oxide is insoluble.

3 Hard

3 of 15

Analyzing +4 | -1

A metal

'M'

reacts with

{\mathrm{N}_2}

to give a compound

'A'\left( {{M_3}N} \right).\mathrm{ }'A'

on heating at high temperature gives back

'M'\mathrm{and '}A'

on reacting with

{\mathrm{H}_2}\mathrm{O}

gives a gas

B.\mathrm{ }'B'

turns

\mathrm{CuS}{\mathrm{O}_4}

solution blue on passing through it.

M\mathrm{and}B

can be

View answer and explanation

Correct option: B

\mathrm{Li and N}{\mathrm{H}_3}

Option B (Li and NH3) is correct because Lithium reacts with nitrogen to form lithium nitride, which reacts with water to produce ammonia, and ammonia turns CuSO4 solution blue.

4 Hard

4 of 15

Analyzing +4 | -1

Which of the following acts as reducing agent as well as oxidising agent?

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Correct option: B

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

Option B (Statement I, II are incorrect) is correct because NH4Cl is a salt of a weak base and strong acid, so its aqueous solution is acidic (pH < 7).

5 Hard

5 of 15

Remembering +4 | -1

Lithopone is a mixture of:

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Correct option: A

Barium sulphate and zinc sulphide

Option A (Barium sulphate and zinc sulphide) is correct because Lithopone is indeed a mixture of these two compounds, used as a white pigment.

6 Hard

6 of 15

Application +4 | -1

The value of

n

in the molecular formula

Be{}_n^{}\mathrm{A}{\mathrm{I}_2}\mathrm{S}{\mathrm{i}_6}{\mathrm{O}_{18}}

View answer and explanation

Correct option: C

Option C (3) is correct because the value of n is calculated by ensuring the overall charge of the compound is neutral.

7 Hard

7 of 15

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.

8 Hard

8 of 15

Understanding +4 | -1

A solution of sodium thiosulphate on addition of few drops of ferric chloride gives violet colour due to the formation of

View answer and explanation

Correct option: C

\mathrm{F}{\mathrm{e}_2}{\left( {{\mathrm{S}_2}{\mathrm{O}_3}} \right)_3}

Option C (

\mathrm{F}{\mathrm{e}_2}{\left( {{\mathrm{S}_2}{\mathrm{O}_3}} \right)_3}

) is correct because ferric thiosulphate is formed when ferric chloride reacts with sodium thiosulphate, giving a violet color.

9 Hard

9 of 15

Analyzing +4 | -1

Which of the following statement is not correct?

View answer and explanation

Correct option: A

{BeF}_2

forms complex ion with

{NaF}

in which

{Be}

goes with cation

Option A is correct because

{BeF}_2

forms a complex ion with

{NaF}

where

{Be}

goes with the anion, not the cation, forming

{Na}_2[{BeF}_4]

10 Hard

10 of 15

Remembering +4 | -1

Which of the following is commercially known as oxone ?

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Correct option: A

Na_2O_2+HCl

The correct answer is A (

Na_2O_2+HCl

) because a mixture of sodium peroxide and hydrochloric acid is commercially known as oxone and is used as a bleaching agent.

11 Hard

11 of 15

Remembering +4 | -1

Mixture of

\mathrm{MgC}{\mathrm{l}_2}\mathrm{and MgO}

is called

View answer and explanation

Correct option: B

Sorel’s cement

Option B (Sorel’s cement) is correct because a mixture of

\mathrm{MgCl}_2

and MgO is known as Sorel's cement.

12 Hard

12 of 15

Application +4 | -1

The value of

n

in the molecular formula

Be{}_n^{}\mathrm{A}{\mathrm{I}_2}\mathrm{S}{\mathrm{i}_6}{\mathrm{O}_{18}}

View answer and explanation

Correct option: C

Option C (3) is correct because the charge balance in the given formula requires n to be 3 to maintain neutrality.

13 Hard

13 of 15

Understanding +4 | -1

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is

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Correct option: D

more efficient as it can exchange both cations as well as anions

Option D is correct because synthetic resins can exchange both cations and anions, making them more efficient than zeolites which primarily exchange cations.

14 Hard

14 of 15

Remembering +4 | -1

Lithopone is

View answer and explanation

Correct option: C

\mathrm{ZnS} + \mathrm{BaS}{\mathrm{O}_4}

Option C (

\mathrm{ZnS} + \mathrm{BaS}{\mathrm{O}_4}

) is correct because Lithopone is a mixture of Zinc sulfide (ZnS) and Barium sulfate (BaSO4), used as a white pigment.

15 Hard

15 of 15

Remembering +4 | -1

Alkali metal superoxides are obtained by the reaction of

View answer and explanation

Correct option: A

Oxygen with alkali metal in liquid ammonia

Option A (Oxygen with alkali metal in liquid ammonia) is correct because alkali metals react with oxygen in liquid ammonia to form superoxides.

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Key Takeaways

✓ This set contains 15 single-correct-answer MCQs on S-BLOCK ELEMENTS.
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