Zinc reacts with conc. ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ to produce:

${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$

The electronic configuration of $\mathrm{Cu}(\mathrm{II})$ is $3 d^9$, whereas that of $\mathrm{Cu}(\mathrm{I})$ is $3 d^{10}$. Which of the following is correct?

$\mathrm{Cu}(\mathrm{II})$ is less stable

$\mathrm{Cu}$ (I) and $\mathrm{Cu}$ (II) are equally stable

Stability of $\mathrm{Cu}(\mathrm{I})$ and $\mathrm{Cu}$ (II) depends on nature of copper salts

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JEE • CHEMISTRY • d & f- BLOCK ELEMENTS

D & f- 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 1-30 of 139 questions

1 Easy

1 of 139

Remembering +4 | -1

Mercury is transported in metal containers made of:

View answer and explanation

Correct option: C

Iron

Option C (Iron) is correct because mercury does not form an amalgam with iron, making it a suitable material for transporting mercury.

2 Easy

2 of 139

Remembering +4 | -1

Cadmipone is a mixture of:

View answer and explanation

Correct option: A

CdS and

\mathrm{BaS}{\mathrm{O}_4}

Option A (CdS and

\mathrm{BaS}{\mathrm{O}_4}

) is correct because Cadmipone is a mixture of cadmium sulfide (CdS) and barium sulfate (

\mathrm{BaS}{\mathrm{O}_4}

3 Easy

3 of 139

Application +4 | -1

Which of the following electronic arrangement will give highest value of magnetic moment?

View answer and explanation

Correct option: C

\mathrm{d}^4

, weak field

Option C (d⁴, weak field) is correct because it results in the highest number of unpaired electrons, leading to the highest magnetic moment.

4 Easy

4 of 139

Remembering +4 | -1

Which of the following shows maximum number of oxidation states

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Correct option: C

Option C (Mn) is correct because Manganese (Mn) exhibits the maximum number of oxidation states, ranging from +2 to +7.

5 Easy

5 of 139

Application +4 | -1

Which of the following has the maximum number of unpaired electrons?

View answer and explanation

Correct option: D

{Fe}^{2+}

Option D (

{Fe}^{2+}

) is correct because it has the electronic configuration (Ar) 3d⁶, resulting in four unpaired electrons.

6 Easy

6 of 139

Remembering +4 | -1

An element which is highly toxic for plants and animals is:

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Correct option: C

Option C (Hg) is correct because Mercury (Hg) and its compounds are highly toxic to both plants and animals.

7 Easy

7 of 139

Remembering +4 | -1

Molten Ag absorbs about ……… times of

{\mathrm{O}_2}

View answer and explanation

Correct option: B

Option B (20) is correct because molten Ag absorbs about 20 times of

{\mathrm{O}_2}

8 Easy

8 of 139

Application +4 | -1

The magnetic moment in Bohr's magneton (BM) of

\left[{Fe}({CN})_6\right]^{4-}

and

\left[{PtCl}_4\right]^{2-}

respectively are

View answer and explanation

Correct option: D

Zero, Zero

Option D (Zero, Zero) is correct because both complexes are diamagnetic with no unpaired electrons, resulting in a magnetic moment of zero.

9 Easy

9 of 139

Understanding +4 | -1

Which of the following is amphoteric?

View answer and explanation

Correct option: B

\mathrm{CuO}

Option C (

{\mathrm{V}_2}{\mathrm{O}_5}

) is correct because vanadium(V) oxide exhibits both acidic and basic properties, making it amphoteric.

10 Easy

10 of 139

Remembering +4 | -1

Zinc reacts with conc.

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

to produce:

View answer and explanation

Correct option: A

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

Option D (None of these) is correct because the reaction of zinc with concentrated sulfuric acid produces zinc sulfate, water, and sulfur dioxide, not sulfuric acid, zinc carbonate, or zinc.

11 Easy

11 of 139

Remembering +4 | -1

The substance that sublimes on heating is:

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Correct option: C

\mathrm{HgC}{\mathrm{l}_2}

Option C (

\mathrm{HgC}{\mathrm{l}_2}

) is correct because mercury(II) chloride (

\mathrm{HgC}{\mathrm{l}_2}

) sublimes upon heating, meaning it transitions directly from a solid to a gas phase.

12 Easy

12 of 139

Remembering +4 | -1

Two of the constituents of German silver are

View answer and explanation

Correct option: C

Cu + Zn

Option C (Cu + Zn) is correct because German silver is an alloy primarily composed of copper, zinc, and nickel.

13 Easy

13 of 139

Understanding +4 | -1

Powdered silver ore is treated with NaCN solution and air is bubbled through the mixture to give:

View answer and explanation

Correct option: D

\mathrm{Na}\left[ {\mathrm{Ag}{{\left( {\mathrm{CN}} \right)}_2}} \right]

Option D (

\mathrm{Na}\left[ {\mathrm{Ag}{{\left( {\mathrm{CN}} \right)}_2}} \right]

) is correct because silver ore reacts with NaCN in the presence of air to form a soluble silver cyanide complex, sodium dicyanoargentate(I).

14 Easy

14 of 139

Remembering +4 | -1

Bronze is a mixture of

View answer and explanation

Correct option: B

Cu+ Sn

Option B (Cu+ Sn) is correct because bronze is an alloy primarily composed of copper (Cu) and tin (Sn).

15 Easy

15 of 139

Remembering +4 | -1

Choose the example of paramagnetic substance.

View answer and explanation

Correct option: B

{O}_2

Option B (

{O}_2

) is correct because oxygen molecules have two unpaired electrons, making it paramagnetic.

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16 Easy

16 of 139

Analyzing +4 | -1

The electronic configuration of

\mathrm{Cu}(\mathrm{II})

3 d^9

, whereas that of

\mathrm{Cu}(\mathrm{I})

3 d^{10}

. Which of the following is correct?

View answer and explanation

Correct option: A

\mathrm{Cu}

(II) is more stable

Option A (Cu(II) is more stable) is correct because although Cu(I) has a stable

3d^{10}

configuration, Cu(II) is more stable in aqueous solution due to its higher hydration energy which compensates for the energy needed for the second ionization.

17 Easy

17 of 139

Understanding +4 | -1

Percentage of gold in 21.6 carat gold is:

View answer and explanation

Correct option: B

Option A (1) is correct because Xe in XeOF4 has sp3d2 hybridization with one lone pair of electrons.

18 Easy

18 of 139

Analyzing +4 | -1

Which shows a jump in second ionization potential?

View answer and explanation

Correct option: D

Option D (Cu) is correct because copper has an electronic configuration of [Ar]3d¹⁰4s¹, and removing the second electron requires breaking the stable, fully filled 3d¹⁰ configuration, resulting in a large jump in ionization energy.

19 Easy

19 of 139

Remembering +4 | -1

Useful lanthanoid member is:

View answer and explanation

Correct option: A

Cerium

Option A (Cerium) is correct because Cerium is used in gas mantles, glass polishing, and lighter flints.

20 Easy

20 of 139

Application +4 | -1

Electronic configuration of a transition element x in +3 oxidation state is

\left[ {Ar} \right]3{d^5}

. It’s atomic number is

View answer and explanation

Correct option: B

Option B (26) is correct because the atomic number is calculated by adding the number of electrons in Argon, the 3d orbital, and the oxidation state.

21 Easy

21 of 139

Remembering +4 | -1

Which of the following is the correct sequence of atomic weights of given elements?

View answer and explanation

Correct option: A

\mathrm{Co} > Ni > Fe

Option A (

\mathrm{Co} > Ni > Fe

) is correct because the atomic weights are approximately Co (58.9), Ni (58.7), and Fe (55.8), thus Co > Ni > Fe.

22 Easy

22 of 139

Remembering +4 | -1

Which ion in aqueous medium has orange colour?

View answer and explanation

Correct option: A

\mathrm{C}{\mathrm{r}_2}\mathrm{O}_7^{2 - }

Option A (

\mathrm{C}{\mathrm{r}_2}\mathrm{O}_7^{2 - }

) is correct because dichromate ions (

\mathrm{C}{\mathrm{r}_2}\mathrm{O}_7^{2 - }

) are known to have an orange color in aqueous solutions.

23 Easy

23 of 139

Remembering +4 | -1

Lightest transition element is:

View answer and explanation

Correct option: B

Option B (Sc) is correct because Scandium (Sc) is the first element in the first transition series and has the lowest atomic mass among the given options.

24 Easy

24 of 139

Remembering +4 | -1

Which is less reactive?

View answer and explanation

Correct option: C

The correct answer is C (Pt) because Platinum (Pt) is a noble metal and is known for its inertness and resistance to chemical reactions, making it less reactive than the other options.

25 Easy

25 of 139

Analyzing +4 | -1

A solid (A) which has photographic effect reacts with the solution of a sodium salt (B) to give a pale yellow ppt. (C). Sodium salt on heating gives brown vapours.

Identify A, B and C .

View answer and explanation

Correct option: A

\mathrm{AgN}{\mathrm{O}_3},\mathrm{\;NaBr},\mathrm{\;AgBr}

Option A (

\mathrm{AgN}{\mathrm{O}_3},\mathrm{\;NaBr},\mathrm{\;AgBr}

) is correct because silver nitrate reacts with sodium bromide to form silver bromide, a pale yellow precipitate used in photography, and sodium bromide produces brown fumes upon heating.

26 Easy

26 of 139

Remembering +4 | -1

Aqueous solution of which ion is pink in colour

View answer and explanation

Correct option: C

{Mn}^{2+}

Option C (

{Mn}^{2+}

) is correct because aqueous solutions of manganese(II) ions are typically pale pink in color.

27 Easy

27 of 139

Remembering +4 | -1

Verdigris is

View answer and explanation

Correct option: B

Basic copper acetate

Option B (Basic copper acetate) is correct because verdigris is a green pigment consisting of basic copper acetate.

28 Easy

28 of 139

Understanding +4 | -1

Which of the following electronic configurations belong to transition elements?

View answer and explanation

Correct option: A

3{s^2}{p^6}{d^5},4{s^1}

Option A is correct because transition elements are characterized by having partially filled d-orbitals, which is the case in the given electronic configuration KL 3s²3p⁶3d⁵, 4s¹.

29 Easy

29 of 139

Understanding +4 | -1

Maximum magnetic moment is shown by

View answer and explanation

Correct option: A

d^5

Option A (

d^5

) is correct because it has the maximum number of unpaired electrons (5), leading to the highest magnetic moment.

30 Easy

30 of 139

Remembering +4 | -1

Agrentite is an ore of

View answer and explanation

Correct option: D

Option D (Ag) is correct because Argentite is a silver sulfide mineral with the chemical formula Ag₂S, making it an ore of silver.

Revision notes and key takeaways

Review d & f- BLOCK ELEMENTS in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 139 single-correct-answer MCQs on d & f- BLOCK ELEMENTS.
✓ Try each question before opening its answer. Read the explanation where one is available.
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