Reason of lanthanoid contraction is:

Important Questions on The d- and f-Block Elements

EASY

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 36

Account for the following: $\mathrm{Zn}, \mathrm{Cd}, \mathrm{Hg}$ are considered as d-block elements but not as transition elements.
 

EASY

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 37

Account for the following: Chromates change their colour when kept in an acidic solution.

EASY

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 38

Account for the following: Copper (I) compounds are white whereas copper (II) compounds are coloured.

MEDIUM

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 39

Give reason and select one atom/ion which will exhibit asked property : 
$\mathrm{Cr}$ or $\mathrm{Cu}$ (High melting and boiling point)

EASY

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 40

Calculate the spin only moment of ${\mathrm{Co}}^{2+} \left(\mathrm{Z}=27\right)$ by writing electronic configuration of $\mathrm{Co}$ and ${\mathrm{Co}}^{2+}$

EASY

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 41

Give reasons: ${\mathrm{Sc}}^{3+}$ is a colourless in aqueous solution whereas ${\mathrm{Ti}}^{3+}$ is coloured.

MEDIUM

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 42

What is the change in oxidation number of sulphur during the oxidation of sulphite ion to sulphate ion by potassium permanganate in acidic medium?

EASY

12th Uttar Pradesh Board

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 4 - The d- and f-Block Elements>Exercise>Q 43

Write a reaction of potassium permanganate in neutral medium.