CBSE Class 12 Chemistry Worksheet - Transition Elements. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
Q1. Give reasons for the following:-
(a) As compared to elements of the first transition series, heavier transition metals of second & third transition series show more frequent metal - metal bonding.
(b) Elements of second and third d series have similar radii.
(c) The unipositive transition metal ion have d" configuration.
(d) Scandium (II) is virtually unknown.
(e) Titanium (IV) is more stable than Titanium (II) or Titanium (III).
(f) Oxidation states in transition elements vary from each other by unity (eg V(ll) V(IlI) V(JV) V(V) whereas oxidation states of non transition states normally differ by a unit of two.
(g) In non transition elements; lower transition state is favoured by heavier elements whereas in transition elements higher transition state is favoured by heavier elements.
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