CBSE Class 12 Chemistry The d and f block 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.
ONE MARK QUESTIONS
1.What is Misch metal? Give its use.
2.Why do most of the transition metal ions exhibit characteristic colour in aqueous solution?
TWO MARK QUESTIONS
1.Why do transition elements show variable oxidation states? How is the variability in oxidation states of d-block different from that of the p-block elements? (2015)
2.What is Lanthanoid contraction? Give its consequences.
3.Explain with equations, how the colour of a solution of K2Cr2O7 depends on pH.
4.Complete and balance the following chemical equations:
a) Cr2O72- + I- + H+→
b) MnO4- + SO32- + H+→
5.Answer the following questions:
a) Why do actonoids in general exhibit a greater range of oxidation states than the Lanthanoids?
b) Which element in the first series of transition elements does not exhibit variable oxidation states and why? (2007)
6.Describe the preparation of
a) Potassium dichromate from sodium chromate and
b) KMnO4 from K2MnO4(2016)
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