Match the catalysts to the correct process. Catalyst Process A. T i C l 3 i. Wacker process B. P d C l 2 ii. Ziegler – Natta polymerisation C. C u C l 2 iii. Contact process` D. V 2 O 5 iv. Deacon’s process

A → i i , B → i , C → i v , D → i i i

A → i i i , B → i , C → i i , D → i v

A → i i i , B → i i , C → i v , D → i

A → i i , B → i i i , C → i v , D → i

The colour of K M n O 4 is due to: [where M → metal, L → ligand]

L → M charge transfer transition

M → L charge transfer transition

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Cu 2 + in water is more stable than Cu + . Reason (R) : Enthalpy of hydration for Cu 2 + is much less than that of Cu + . In the light of the above statements, choose the correct answer from the options given below :

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

(A) is correct but (R) is not correct.

(A) is not correct but (R) is correct.

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

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The first ionization enthalpy of 3 d series elements is more than that of group 2 metals Reason (R): In 3 d series of elements successive filling of d -orbitals takes place. In the light of the above statements, choose the correct answer from the options given below:

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)

E M B I B E

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 6 September 2020 Shift 1>Q 29

MEDIUM

JEE Main

IMPORTANT

Earn 100

The lanthanoid that does NOT show + 4 oxidation state is:

66.67% studentsanswered this correctly

Important Questions on The d- and f-Block Elements

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 5 September 2020 Shift 1>Q 30

In the sixth period, the orbitals that are filled are :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 5 September 2020 Shift 1>Q 31

The correct electronic configuration and spin-only magnetic moment (BM) of

{Gd}^{3 +} (Z = 64),

respectively, are :

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 4th April 2015>Q 32

Match the catalysts to the correct process.

	Catalyst		Process
A.	$T i C l_{3}$	i.	Wacker process
B.	$P d C l_{2}$	ii.	Ziegler – Natta polymerisation
C.	$C u C l_{2}$	iii.	Contact process`
D.	$V_{2} O_{5}$	iv.	Deacon’s process

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 4th April 2015>Q 33

The colour of

K M n O_{4}

is due to: [where

M \to

metal,

L \to

ligand]

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 4 September 2020 Shift 2>Q 34

The incorrect statement(s) among (a) - (c) is (are) :

(a) $W (VI)$ is more stable than $Cr (VI)$ .

(b) in the presence of $HCl$ , permanganate titrations provide satisfactory results.

(c) some lanthanoid oxides can be used as phosphors.

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 3rd April 2016>Q 35

Find the metallic and ferromagnetic substance.

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 31 August 2021 Shift 2>Q 36

The

{Eu}^{2 +}

ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of

Eu = 63

]

EASY

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 31 August 2021 Shift 1>Q 37

In the structure of the dichromate ion, there is a :

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