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)

MEDIUM

JEE Main

IMPORTANT

Earn 100

The total number of $Mn = O$ bonds in ${Mn}_{2} O_{7}$ is

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Important Questions on The d- and f-Block Elements

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 27 July 2022 Shift 2>Q 101

In neutral or alkaline solution,

{MnO}_{4}^{-}

oxidises thiosulphate to

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 27 July 2022 Shift 2>Q 102

The oxidation state of manganese in the product obtained in a reaction of potassium permanganate and hydrogen peroxide in basic medium is

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 28 July 2022 Shift 1>Q 103

The disproportionation of

{MnO}_{4}^{2 -}

in acidic medium resulted in the formation of two manganese compounds

A

and

B

. If the oxidation state of

Mn

B

is smaller than that of

A

, then the spin-only magnetic moment

(μ)

value of

B

BM

is____ . (Nearest integer)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 28 July 2022 Shift 2>Q 104

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

Assertion $A$ : Permanganate titration are not performed in presence of hydrochloric acid.

Reason $R$ : Chlorine is formed as a consequence of oxidation of hydrochloric acid.

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

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 29 July 2022 Shift 1>Q 105

In following pairs, the one in which both transition metal ions are colourless is

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 29 July 2022 Shift 1>Q 106

In neutral or faintly alkaline medium,

{KMnO}_{4}

being a powerful oxidant can oxidise, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 29 July 2022 Shift 2>Q 107

Which of the following

3 d - metal

ion will give the lowest enthalpy of hydration

(Δ_{hyd} H)

when dissolved in water?

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 19 - The d- and f-Block Elements>JEE Main - 24 January 2023 Shift 1>Q 108

The magnetic moment of a transition metal compound has been calculated to be

3.87 BM

. The metal ion is

The total number of Mn=O bonds in Mn2O7 is

Important Questions on The d- and f-Block Elements

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The total number of $Mn = O$ bonds in ${Mn}_{2} O_{7}$ is