jee main chemistry important questions | d And f-Block Elements jee main questions FREE

Q 11 :

Strong reducing and oxidizing agents among the following, respectively, are [2023]

${Eu}^{2 +}$ and ${Ce}^{4 +}$
${Ce}^{4 +}$ and ${Eu}^{2 +}$
${Ce}^{4 +}$ and ${Tb}^{4 +}$
${Ce}^{3 +}$ and ${Ce}^{4 +}$

1

2

3

4

(1)

$(E_{{Ce}^{+ 4} / {Ce}^{+ 3}}^{0}) {}_{RP}= 1.74 V$

${Eu}^{+ 2}$ is a strong reducing agent converting to common oxidation state +3, where as $C e^{4 +}$ is a strong oxidising agent converting to +3-oxidation state.

Q 12 :

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

Assertion A: $5 f$ electrons can participate in bonding to a far greater extent than $4 f$ electrons.

Reason R: $5 f$ orbitals are not as buried as $4 f$ orbitals.

In the light of the above statements, choose the correct answer from the options given below. [2023]

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

1

2

3

4

(4)

As number of valence shell is higher, electrons of its orbitals can participate in bonding in greater extents. $4 f$ electron is more shielded as compared to $5 f$ electrons. $5 f$ orbitals are not as buried as $4 f$ orbitals.

Q 13 :

The pair of lanthanides in which both elements have high third-ionization energy is: [2023]

Dy, Gd
Lu, Yb
Eu, Yb
Eu, Gd

1

2

3

4

(3)

Element	Electronic configuration
Europium (Eu)	$[X e] 4 f^{7} 6 s^{2}$
Gadolinium (Gd)	$[X e] 4 f^{7} 5 d^{1} 6 s^{2}$
Dysprosium (Dy)	$[X e] 4 f^{10} 6 s^{2}$
Ytterbium (Yb)	$[X e] 4 f^{14} 6 s^{2}$
Lutetium (Lu)	$[X e] 4 f^{14} 5 d^{1} 6 s^{2}$

${Eu}^{+ 2}$ and ${Yb}^{+ 2}$ have high $IE$ due to half-filled and fully filled configuration.

Q 14 :

The incorrect statements among the following is [2025]

${PH}_{3}$ shows lower proton affinity than ${NH}_{3}$ .
${PF}_{3}$ exists but ${NF}_{5}$ does not.
${NO}_{2}$ can dimerise easily.
${SO}_{2}$ can act as an oxidizing agent, but not as a reducing agent.

1

2

3

4

Topic Question Set

Q 11 :

Strong reducing and oxidizing agents among the following, respectively, are [2023]

Q 13 :

The pair of lanthanides in which both elements have high third-ionization energy is: [2023]

Q 14 :

The incorrect statements among the following is [2025]

(4)

Want Us to Email you About Special Offers & Updates?

Topic Question Set

Q 14 : The incorrect statements among the following is [2025] .question-row { display: flex; align-items: flex-start; gap: 8px; } .q-no { font-size: 17px; white-space: nowrap; margin-left: -15px; } .q-text { font-size: 18px; flex: 1; } .q-no, .q-text p { line-height: 30px; }

(4)

Want Us to Email you About Special Offers & Updates?

Q 14 :

The incorrect statements among the following is [2025]