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← Bihar Board Class 12 PYQ
The d- and f-Block Elements
Bihar Board Class 12 · Chemistry · 31 past questions
Topic
Electronic configuration
5
Introduction and general characteristics of transition elements
5
Lanthanoids and actinoids
5
Important compounds and biological roles
3
Oxidation states
2
Colour and complex formation
1
Magnetic properties
1
Level
Easy
1
Moderate
4
Year
2026
0
2025
0
2024
1
2023
0
2022
0
2021
0
2019
0
2018
0
2017
0
2016
0
2015
0
1 of 31 ·
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Q11
2024 Set D
The number of unpaired electrons in $Cu^{2+}$ ion ( Z = 29 ) is
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