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JEE • CHEMISTRY • d & f- BLOCK ELEMENTS

D & f- BLOCK ELEMENTS practice · Easy

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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 31-60 of 139 questions

31 Easy

31 of 139

Analyzing +4 | -1

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

View answer and explanation

Correct option: D

3{d^5}4{s^2}

Option D (

3d^5 4s^2

) is correct because it corresponds to Manganese (Mn), which exhibits the largest number of oxidation states (up to +7).

32 Easy

32 of 139

Remembering +4 | -1

Which has the lowest melting point?

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Correct option: C

Option C (Hg) is correct because mercury (Hg) has the lowest melting point among the given metals, at -38.9°C.

33 Easy

33 of 139

Remembering +4 | -1

Among

d

-block elements, the most abundant element belongs to the :

View answer and explanation

Correct option: A

first transition series

Option A (first transition series) is correct because Iron (Fe) is the most abundant d-block metal and it belongs to the first transition series.

34 Easy

34 of 139

Remembering +4 | -1

Identity the ore not containing iron.

View answer and explanation

Correct option: C

Carnallite

Option C (Carnallite) is correct because Carnallite (

\mathrm{KCl}.\mathrm{MgCl}_2.6{\mathrm{H}_2}\mathrm{O}

) does not contain iron.

35 Easy

35 of 139

Remembering +4 | -1

As percentage of carbon increase in iron, its hardness:

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Correct option: B

Increases

Option B (Increases) is correct because increasing the carbon content in iron increases its hardness due to the formation of iron carbide (cementite), which is a hard and brittle phase.

36 Easy

36 of 139

Understanding +4 | -1

C{r^{2 + }}\,\,\mathrm{and}\,\,M{n^{2 + }}

respectively are

View answer and explanation

Correct option: A

Reductant and oxidant

Option A (Reductant and oxidant) is correct because

C{r^{2 + }}

tends to oxidize to

C{r^{3 + }}

(reductant) and

M{n^{2 + }}

can be oxidized further but also can be reduced (oxidant).

37 Easy

37 of 139

Remembering +4 | -1

Which of the following is not an ore of iron?

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Correct option: B

Casiterite

Option B (Casiterite) is correct because Casiterite is an ore of tin (

Sn

), not iron.

38 Easy

38 of 139

Remembering +4 | -1

The group of metals which is known as ferrous metals is:

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Correct option: A

Fe, Co, Ni

Option A (Fe, Co, Ni) is correct because Iron (Fe), Cobalt (Co), and Nickel (Ni) are the metals that are known as ferrous metals.

39 Easy

39 of 139

Understanding +4 | -1

What effect is noticed on shaking dilute sulphuric acid with a small quantity of anhydrous copper sulphate?

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Correct option: D

The white solid dissolves to form a blue solution

Option D is correct. Anhydrous copper sulfate dissolves in water to form a blue solution due to the formation of hydrated copper ions.

40 Easy

40 of 139

Remembering +4 | -1

Platinum metal can be dissolved in:

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Correct option: D

A mixture of hydrochloric and nitric acids

Option D (A mixture of hydrochloric and nitric acids) is correct because platinum dissolves in aqua regia, which is a mixture of concentrated hydrochloric and nitric acids.

41 Easy

41 of 139

Remembering +4 | -1

Monel metal is an alloy of?

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Correct option: A

Cu, Ni, Fe, Mn

Option A (Cu, Ni, Fe, Mn) is correct because Monel metal is primarily an alloy of copper and nickel, with smaller amounts of iron and manganese.

42 Easy

42 of 139

Analyzing +4 | -1

Assertion:

d^5

configuration is more stable than

d^4

Reason:

d^5

has more exchange energy as compared to

d^4

because 10 & 6 exchanges are possible in

d^5

d^4

respectively.

View answer and explanation

Correct option: A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Option A (If both Assertion and Reason are correct and Reason is the correct explanation of Assertion) is correct because d5 configuration has higher exchange energy due to maximum possible parallel spins.

43 Easy

43 of 139

Remembering +4 | -1

Chemical name of vermilion is:

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Correct option: A

Mercuric sulphide

Option A (Mercuric sulphide) is correct because the chemical name of vermilion is mercuric sulfide (HgS).

44 Easy

44 of 139

Remembering +4 | -1

Duraluminium is an alloy contains:

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Correct option: B

Mg + Cu + Al + Mn + Si

Option B (Mg + Cu + Al + Mn + Si) is correct because duralumin is an alloy of aluminum with copper, magnesium, manganese, and silicon.

45 Easy

45 of 139

Remembering +4 | -1

Thermite is a mixture of iron oxide and:

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Correct option: D

Al powder

Option D (Al powder) is correct because thermite is a mixture of iron oxide and aluminum powder, used in welding.

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46 Easy

46 of 139

Application +4 | -1

The octahedral diamagnetic low spin complex among the following is

View answer and explanation

Correct option: A

\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3 +}

Option A (

\mathrm{Co}(\mathrm{NH}_3)_6^{3 +}

) is correct because it forms a low-spin, diamagnetic octahedral complex due to the strong field ligand NH3.

47 Easy

47 of 139

Understanding +4 | -1

Which one of the following is an example of non-typical transition elements?

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Correct option: B

{Zn}, {Cd}, {Hg}

Option B (

{Zn}, {Cd}, {Hg}

) is correct because these elements have a completely filled d-orbital in their common oxidation states, and thus do not exhibit typical transition metal properties.

48 Easy

48 of 139

Remembering +4 | -1

Ferric sulphate on heating gives:

View answer and explanation

Correct option: C

\mathrm{S}{\mathrm{O}_3}

only

Option C (

\mathrm{S}{\mathrm{O}_3}

only) is correct because ferric sulfate decomposes to ferric oxide and sulfur trioxide upon heating.

49 Easy

49 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.

50 Easy

50 of 139

Analyzing +4 | -1

Which of the following is most stable?

View answer and explanation

Correct option: D

\mathrm{C}{\mathrm{r}^{3 + }}

Option D is correct. Cr3+ is the most stable due to its d3 configuration, which leads to a stable t2g configuration in an octahedral field.

51 Easy

51 of 139

Remembering +4 | -1

Essential constituent of an amalgam is:

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Correct option: D

Mercury

Option D (Mercury) is correct because mercury is the essential component of an amalgam, which is an alloy of mercury with another metal.

52 Easy

52 of 139

Analyzing +4 | -1

The transition metal having highest

3^{\text {rd }}

ionisation enthalpy is :

View answer and explanation

Correct option: B

\mathrm{Mn}

Option B (Mn) is correct because Mn has the highest 3rd ionization enthalpy due to its stable d5 configuration after the removal of two electrons.

53 Easy

53 of 139

Remembering +4 | -1

Mercury is purified by:

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Correct option: B

Distillation in vacuum

Option B (Distillation in vacuum) is correct because mercury has a relatively low boiling point, and vacuum distillation is an effective method for purifying it.

54 Easy

54 of 139

Remembering +4 | -1

Transition metals mostly are

View answer and explanation

Correct option: B

Paramagnetic

Option B (Paramagnetic) is correct because transition metals generally have unpaired electrons in their d-orbitals, which causes them to exhibit paramagnetism.

55 Easy

55 of 139

Understanding +4 | -1

Zr (z=40) and Hf (z=72) have similar atomic radii because of

View answer and explanation

Correct option: D

Lanthanoid contraction

Option D (Lanthanoid contraction) is correct because the lanthanoid contraction causes the atomic radii of Zr and Hf to be very similar due to the poor shielding of the 4f electrons.

56 Easy

56 of 139

Remembering +4 | -1

An example of double salt is:

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Correct option: D

Potash alum

Option D (Potash alum) is correct because double salts are formed by the combination of two different salts, and potash alum (KAl(SO₄)₂·12H₂O) fits this description.

57 Easy

57 of 139

Remembering +4 | -1

The colour of copper sulphide is

View answer and explanation

Correct option: B

Black

Option B (Black) is correct because copper sulfide (CuS) is a black solid.

58 Easy

58 of 139

Application +4 | -1

The one which has lowest ox. no. of Hg:

View answer and explanation

Correct option: D

\mathrm{H}{\mathrm{g}_2}\mathrm{C}{\mathrm{l}_2}

Option D (

\mathrm{H}{\mathrm{g}_2}\mathrm{C}{\mathrm{l}_2}

) is correct because in this compound, mercury exists as Hg2²⁺, giving it an oxidation state of +1.

59 Easy

59 of 139

Understanding +4 | -1

Ferrous sulphate on heating gives:

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Correct option: D

All of these

Option D (All of these) is correct because ferrous sulfate decomposes upon heating to produce ferric oxide, sulfur dioxide, and sulfur trioxide.

60 Easy

60 of 139

Remembering +4 | -1

The general electronic configuration of

\mathrm{Zn}, \mathrm{Cd}

and

\mathrm{Hg}

is represented by :

View answer and explanation

Correct option: A

(n-1) d^{10} n s^2

Option A (

(n-1) d^{10} n s^2

) is correct because Zinc (Zn), Cadmium (Cd), and Mercury (Hg) are group 12 elements and have a completely filled d-orbital and two electrons in the s-orbital.

Revision notes and key takeaways

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

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