JEE Main d and f Block Elements Practice Questions With Solutions

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JEE Main Chemistry d and f Block Elements Practice Questions

Question 1.

The electronic configuration of Einsteinium is :

(Given atomic number of Einsteinium $= 99$ )

[Rn] 5 f^{13} 6 d^{\circ} 7 s^{2}

[Rn] 5 f^{12} 6 d^{\circ} 7 s^{2}

[Rn] 5 f^{11} 6 d^{\circ} 7 s^{2}

[Rn] 5 f^{10} 6 d^{\circ} 7 s^{2}

Question 2.

Give below are two statements :

Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements.

Statement II : Copper can not liberate hydrogen from weak acids.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is true but Statement II is false

Both Statement I and Statement II are false

Both Statement I and Statement II are true

Statement I is false but Statement II is true

Question 3.

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

Cu (II)

is more stable

Cu

(II) is less stable

Cu (I)

and

Cu (II)

are equally stable

Stability of

Cu (I)

and

Cu (II)

depends on nature of copper salts

Question 4.

Iron (III) catalyses the reaction between iodide and persulphate ions, in which

A. ${Fe}^{3 +}$ oxidises the iodide ion

B. ${Fe}^{3 +}$ oxidises the persulphate ion

C. ${Fe}^{2 +}$ reduces the iodide ion

D. ${Fe}^{2 +}$ reduces the persulphate ion

Choose the most appropriate answer from the options given below:

B and C only

A only

A and D only

B only

Question 5.

Arrange the following elements in the increasing order of number of unpaired electrons in it.

(A) $Sc$

(B) $Cr$

(D) $Ti$

(E) $Mn$

Choose the correct answer from the options given below :

(A) < (D) < (C) < (B) < (E)

(A) < (D) < (C) < (E) < (B)

(B) < (C) < (D) < (E) < (A)

(C) < (E) < (B) < (A) < (D)

Question 6.

The number of element from the following that do not belong to lanthanoids is $Eu, Cm, Er, Tb, Yb$ and $Lu$

Question 7.

While preparing crystals of Mohr's salt, dil $H_{2} {SO}_{4}$ is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil $H_{2} {SO}_{4}$ is added here to :

prevent the hydrolysis of ferrous sulphate

prevent the hydrolysis of ammonium sulphate

increase the rate of formation of crystals

make the medium strongly acidic

Question 8.

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is _________.

${Ti}^{2 +}, {Cr}^{2 +} and V^{2 +}$

Question 9.

The metal that shows highest and maximum number of oxidation state is :

Question 10.

The element which shows only one oxidation state other than its elemental form is :

Nickel

Titanium

Cobalt

Scandium

Question 1.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In aqueous solutions

{Cr}^{2 +}

is reducing while

{Mn}^{3 +}

is oxidising in nature.

Reason (R) : Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration.

In the light of the above statements, choose the most appropriate answer from the options given below :

(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

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

(A) is false but (R) is true

Question 2.

Choose the correct statements from the following

A. ${Mn}_{2} O_{7}$ is an oil at room temperature

B. $V_{2} O_{4}$ reacts with acid to give ${VO}_{2}^{2 +}$

C. $CrO$ is a basic oxide

D. $V_{2} O_{5}$ does not react with acid

Choose the correct answer from the options given below :

A, B and D only

A, B and C only

A and C only

B and C only

Question 3.

Identify correct statements from below:

A. The chromate ion is square planar.

B. Dichromates are generally prepared from chromates.

C. The green manganate ion is diamagnetic.

D. Dark green coloured $K_{2} {MnO}_{4}$ disproportionates in a neutral or acidic medium to give permanganate.

E. With increasing oxidation number of transition metal, ionic character of the oxides decreases.

Choose the correct answer from the options given below:

B, D, E only

A, B, C only

A, D, E only

B, C, D only

Question 4.

The metals that are employed in the battery industries are

A. $Fe$

B. $Mn$

C. $Ni$

D. $Cr$

E. $Cd$

Choose the correct answer from the options given below:

A, B, C, D and E

A, B, C and D only

B, D and E only

B, C and E only

Question 5.

The orange colour of $K_{2} {Cr}_{2} O_{7}$ and purple colour of ${KMnO}_{4}$ is due to

Charge transfer transition in both.

d \to d

transitions in

{KMnO}_{4}

and charge transfer transitions in

K_{2} {Cr}_{2} O_{7}

d \to d

transitions in both

d \to d

transitions in

K_{2} {Cr}_{2} O_{7}

and charge transfer transitions in

{KMnO}_{4}

Question 6.

Diamagnetic Lanthanoid ions are :

{La}^{3 +} & {Ce}^{4 +}

{Nd}^{3 +} & {Ce}^{4 +}

{Lu}^{3 +} & {Eu}^{3 +}

{Nd}^{3 +} & {Eu}^{3 +}

Question 7.

Which of the following acts as a strong reducing agent? (Atomic number: $Ce = 58, Eu = 63, Gd = 64, Lu = 71$ )

{Eu}^{2 +}

{Gd}^{3 +}

{Lu}^{3 +}

{Ce}^{4 +}

Question 8.

Which of the following statements are correct about $Zn, Cd$ and $Hg$ ?

A. They exhibit high enthalpy of atomization as the d-subshell is full.

B. $Zn$ and $Cd$ do not show variable oxidation state while $Hg$ shows $+ I$ and $+ II$ .

C. Compounds of $Zn, Cd$ and $Hg$ are paramagnetic in nature.

D. $Zn, Cd$ and $Hg$ are called soft metals.

Choose the most appropriate from the options given below:

C, D only

B, C only

A, D only

B, D only

Question 9.

The correct IUPAC name of $K_{2} {MnO}_{4}$ is

Potassium tetraoxidomanganate (VI)

Dipotassium tetraoxidomanganate (VII)

Potassium tetraoxopermanganate (VI)

Potassium tetraoxidomanganese (VI)

Question 10.

${KMnO}_{4}$ decomposes on heating at $513 K$ to form $O_{2}$ along with

K_{2} {MnO}_{4} & Mn

{MnO}_{2} & K_{2} O_{2}

K_{2} {MnO}_{4} & {MnO}_{2}

Mn & {KO}_{2}

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JEE Main d and f Block Elements Practice Questions With Solutions

JEE Main Chemistry d and f Block Elements Practice Questions

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

Question 1.

Question 2.

Question 3.

Question 4.

Question 5.

Question 6.

Question 7.

Question 8.

Question 9.

Question 10.

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