The addition of dilute $NaOH$ to $C{r^{3 + }}$ salt solution will give

a solution of ${[Cr{(OH)_4}]^ - }$

Precipitate of ${[Cr{(OH)_6}]^{3 - }}$

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

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JEE • CHEMISTRY • S-BLOCK ELEMENTS

S-block elements practice · Mixed difficulty

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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 1-30 of 303 questions

1 Medium

1 of 303

Analyzing +4 | -1

Assertion (A): Among the alkali metals, lithium salts exhibit the least electrical condutance in aqueous solutions.
Reason (R): Smaller the radius of the hydrated cation, lower is the electrical conductance in aqueous solutions.

View answer and explanation

Correct option: C

\mathbf{A}

is true but

\mathbf{R}

is false.

Option C is correct because Assertion (A) is true, lithium salts have the least electrical conductance, but Reason (R) is false, as smaller hydrated radius implies higher conductance.

2 Medium

2 of 303

Analyzing +4 | -1

(A)

is a ternary salt with divalent cation.

(A)

gives yellow ppt. with

\mathrm{K}_2 \mathrm{CrO}_4

as well as with

\mathrm{AgNO}_3

. (A) is precipitated by

\mathrm{H}_2 \mathrm{~S}

neither in acidic nor ammoniacal medium, but addition of

\left(\mathrm{NH}_4\right)_2 \mathrm{CO}_3

\mathrm{NH}_4 \mathrm{OH}

gave white ppt. (B).

0.297 \mathrm{~g}

(A)

gave

0.197 \mathrm{~g}

(B)

. Identify

(A)

View answer and explanation

Correct option: A

\mathrm{BaBr}_2

The correct answer is A (

\mathrm{BaBr}_2

) because it satisfies the given conditions of forming yellow precipitates with

\mathrm{K}_2 \mathrm{CrO}_4

and

\mathrm{AgNO}_3

, and forming a white precipitate with

(\mathrm{NH}_4)_2 \mathrm{CO}_3

\mathrm{NH}_4 \mathrm{OH}

3 Easy

3 of 303

Understanding +4 | -1

In the Down’s cell

\mathrm{KCl}

is added in

\mathrm{NaCl}

to:

View answer and explanation

Correct option: A

Lower its m.p

Option A (Lower its m.p) is correct because adding KCl to NaCl in Down's cell lowers the melting point of the mixture, making electrolysis more energy-efficient.

4 Medium

4 of 303

Remembering +4 | -1

Which of the alkali metal is having least melting point?

View answer and explanation

Correct option: D

Option D (Cs) is correct because melting point decreases down the group in alkali metals due to increasing atomic size and weaker metallic bonding.

5 Easy

5 of 303

Remembering +4 | -1

Fusion mixture is comprised of:

View answer and explanation

Correct option: A

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

Option A (

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

) is correct because the fusion mixture is a combination of potassium carbonate and sodium carbonate.

6 Medium

6 of 303

Analyzing +4 | -1

Statement 1:

{LiCl}

is predominatly a covalent compound.

Statement 2: Electronegativity difference between

{Li}

and

{Cl}

is too small.

View answer and explanation

Correct option: A

Statement 1 is true but statement 2 is false

The correct answer is A (Statement 1 is true but statement 2 is false) because LiCl has significant covalent character due to the high polarizing power of Li+ ion, despite the electronegativity difference.

7 Medium

7 of 303

Analyzing +4 | -1

Metal

({M})+

air

\stackrel{\Delta}{\rightarrow}({A}) \stackrel{{H}_2 {O}}{\longrightarrow}({B}) \stackrel{{HCl}}{\longrightarrow}

white fumes. Metal

{M}

can be

View answer and explanation

Correct option: A

{Li}, {Mg}

{Al}

Option A (

{Li}, {Mg}

{Al}

) is correct because these metals can form nitrides that hydrolyze to produce ammonia, which reacts with HCl to form white fumes of ammonium chloride.

8 Easy

8 of 303

Remembering +4 | -1

The bleaching action of bleaching powder is due to the formation of:

View answer and explanation

Correct option: C

\mathrm{HClO}

Option C (

\mathrm{HClO}

) is correct because the bleaching action of bleaching powder is due to the formation of hypochlorous acid (

\mathrm{HClO}

), which releases nascent oxygen.

9 Easy

9 of 303

Understanding +4 | -1

Assertion (A):

\mathrm{Li}

and

\mathrm{Mg}

shows diagonal relationship.

Reason (R) :

\mathrm{Li}

and

\mathrm{Mg}

are diagonal to each other in the Periodic Table.

View answer and explanation

Correct option: B

Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

Option B (Both

\mathbf{A}

and

\mathbf{R}

are true but

\mathbf{R}

is not the correct explanation of

\mathbf{A}

) is correct because while both the assertion and reason are true, the reason (diagonal placement) doesn't explain the diagonal relationship. The diagonal relationship arises due to similar polarizing power.

10 Easy

10 of 303

Remembering +4 | -1

The pair whose both species are used in ant- acid medicinal preparations is:

View answer and explanation

Correct option: A

NaHCO_3

and

Mg(OH)_2

Option A (

NaHCO_3

and

Mg(OH)_2

) is correct because both sodium bicarbonate and magnesium hydroxide are commonly used as antacids to neutralize stomach acid.

11 Easy

11 of 303

Analyzing +4 | -1

Which of the alkali metal chloride is expected to have highest m.p.?

View answer and explanation

Correct option: A

\mathrm{LiCl}

Option A (

\mathrm{LiCl}

) is correct because, among the given alkali metal chlorides, LiCl has the smallest cation, resulting in the highest lattice energy and thus the highest melting point.

12 Hard

12 of 303

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.

13 Medium

13 of 303

Understanding +4 | -1

Among the alkali metals caesium is the most reactive because

View answer and explanation

Correct option: D

The outermost electron is more loosely bound than the outermost electron of the other alkali metals.

Option D is correct because caesium's outermost electron is the most loosely bound due to its large atomic size, making it the most reactive alkali metal.

14 Easy

14 of 303

Understanding +4 | -1

Alkaline earth metal compounds are les soluble in water than corresponding alkali metal compounds because former have:

View answer and explanation

Correct option: C

Higher covalent character

Option C (Higher covalent character) is correct because alkaline earth metal compounds have a higher covalent character than corresponding alkali metal compounds, leading to lower solubility.

15 Medium

15 of 303

Understanding +4 | -1

Nitrates of which of the following alkali metals decomposes on heating to give corresponding oxide?

View answer and explanation

Correct option: A

{Li}

Option A (

{Li}

) is correct because lithium nitrate decomposes to give lithium oxide, while other alkali metal nitrates decompose to give nitrites.

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16 Medium

16 of 303

Understanding +4 | -1

Which of the following is not correct?

View answer and explanation

Correct option: A

2Li_2O \underset{673 \mathrm{~K}}{\stackrel{\text { heat }}{\longrightarrow}}Li_2O_2+2Li

Option A (

2Li_2O \underset{673 \mathrm{~K}}{\stackrel{\text { heat }}{\longrightarrow}}Li_2O_2+2Li

) is not correct because Lithium primarily forms the monoxide (

Li_2O

) and does not readily form the peroxide (

Li_2O_2

17 Medium

17 of 303

Remembering +4 | -1

Which alkaline earth metal shows some anomalous behaviour and has the same electronegativity as aluminium?

View answer and explanation

Correct option: D

\mathrm{Be}

Option D (

\mathrm{Be}

) is correct because Beryllium (Be) shows anomalous behavior due to its small size and high polarizing power, and it has a similar electronegativity to aluminium.

18 Medium

18 of 303

Understanding +4 | -1

The addition of dilute

NaOH

C{r^{3 + }}

salt solution will give

View answer and explanation

Correct option: B

Precipitate of

C{r_2}{O_3}{({H_2}O)_n}

Option B (Precipitate of

C{r_2}{O_3}{({H_2}O)_n}

) is correct because the addition of dilute NaOH to a Cr3+ salt solution results in the precipitation of hydrated chromium(III) oxide.

19 Medium

19 of 303

Understanding +4 | -1

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Lithium salts are hydrated.
Reason (R) Lithium has higher polarising power than other alkali metal group members.
In the light of the above statements, choose the most appropriate answer from the options given below.

View answer and explanation

Correct option: A

Both (A) and (R) are true but (R) is not the correct explanation of (A).

Option A (Both (A) and (R) are true but (R) is not the correct explanation of (A)) is correct because while both the assertion and reason are true, the reason doesn't directly explain why lithium salts are hydrated.

20 Medium

20 of 303

Remembering +4 | -1

Choose the correct order of density of the alkali metals.

View answer and explanation

Correct option: A

\mathrm{Li}<\mathrm{K}<\mathrm{Na}<\mathrm{Rb}<\mathrm{Cs}

Option A (

\mathrm{Li}<\mathrm{K}<\mathrm{Na}<\mathrm{Rb}<\mathrm{Cs}

) is the correct order of density for alkali metals, considering the anomaly between Na and K.

21 Medium

21 of 303

Remembering +4 | -1

Portland cement does not contain:

View answer and explanation

Correct option: D

C{a_3}{(P{O_4})_2}

Option D (

Ca_3(PO_4)_2

) is correct because Portland cement primarily consists of calcium silicates and aluminates, and does not contain calcium phosphate.

22 Medium

22 of 303

Analyzing +4 | -1

\text{(Mily Cloud) } {C} \stackrel{{CO}_2}{\longleftarrow} {A}+{Na}_2 {CO}_3 \rightarrow {B}+{C}

The chemical formulae of

{A}

and

{B}

are

View answer and explanation

Correct option: B

{Ca}({OH})_2

and

{NaOH}

Option B (

{Ca}({OH})_2

and

{NaOH}

) is correct because calcium hydroxide reacts with carbon dioxide to form calcium carbonate (milky cloud) and with sodium carbonate to form calcium carbonate and sodium hydroxide.

23 Easy

23 of 303

Remembering +4 | -1

Mg burns with a brilliant flame. This property is used in:

View answer and explanation

Correct option: D

All of the above

Option D (All of the above) is correct because magnesium's bright flame when burned makes it useful in fireworks, military signals, and photographic flash bulbs.

24 Medium

24 of 303

Understanding +4 | -1

Select the correct statements

(i)

\mathrm{Cs}^{+}

is more highly hydrated that the other alkali metal ions

(ii) Among the alkali metals

\mathrm{Li}, \mathrm{Na}, \mathrm{K}

and

\mathrm{Rb}

, lithium has the highest melting point

(iii) Among the alkali metals only lithium forms a stable nitride by direct combination with nitrogen

View answer and explanation

Correct option: D

(ii) and (iii)

Option D ((ii) and (iii)) is correct because Li+ is more hydrated, Li has the highest melting point among alkali metals, and only Li forms a stable nitride.

25 Medium

25 of 303

Analyzing +4 | -1

Which of the following is not correct as indicated?

View answer and explanation

Correct option: C

Li\mathrm{ \,\,and }\,\,Na

do not impart colour in oxidizing flame

Option C is correct because ethylene undergoes Sabatier and Senderen's reaction (catalytic hydrogenation) but does not react with ammoniacal silver nitrate.

26 Easy

26 of 303

Remembering +4 | -1

The difference of water molecules in gypsum and plaster of Paris is

View answer and explanation

Correct option: D

1\frac{1}{2}

Option D (

1\frac{1}{2}

) is correct because the difference in water molecules between gypsum and plaster of Paris is calculated by subtracting the number of water molecules in plaster of Paris from that in gypsum.

27 Easy

27 of 303

Understanding +4 | -1

Which of the following metal carbonate is decomposed on heating

View answer and explanation

Correct option: A

MgC{O_3}

Option A (

MgC{O_3}

) is correct because magnesium carbonate decomposes upon heating to form magnesium oxide and carbon dioxide.

28 Medium

28 of 303

Remembering +4 | -1

Alkali metals when dissolved in liquid

{NH}_3

at very high concentration gives which of the following coloured solution?

View answer and explanation

Correct option: C

Bronze

Option C (Bronze) is correct because at high concentrations, alkali metals dissolved in liquid ammonia form metal clusters, leading to a bronze-colored solution.

29 Medium

29 of 303

Analyzing +4 | -1

An inorganic compound first melts then resolidifies and then liberates a gas. It may be:

View answer and explanation

Correct option: A

KCl{O_3}

KClO3 first melts upon heating, then decomposes into KCl (a solid) and O2 (a gas).

30 Medium

30 of 303

Remembering +4 | -1

Baryta is:

View answer and explanation

Correct option: A

\mathrm{BaO}

Option A (

\mathrm{BaO}

) is correct because Baryta is the common name for barium oxide, which has the chemical formula

\mathrm{BaO}

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 303 single-correct-answer MCQs on S-BLOCK ELEMENTS.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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