CBSE Class 12 Chemistry Question Paper SA 2 2013 (1)

CBSE Class 12 Chemistry Question Paper SA 2 2013 (1). Students can download the last year question papers using the link below.Free download of examination question papers with solutions.Last 10 year question papers should be practised to get better marks in examinations.

1. Write down the electronic configuration of

(a) Cr³⁺ (b) Cu⁺ (c) Co²⁺ (d) Mn²⁺

2. Why are Mn2+ compounds more stable than Fe²⁺ towards oxidation to their +3 state?

3. Explain briefly how +2 oxidation state becomes more and more stable in the first half of the first row transition elements with increasing atomic number.

4. To what extent do the electronic configurations decide the stability of oxidation states in the first series of the transition elements is? Illustrate your answer with an example.

5. What must be the stable oxidation state of the transition elements with the following electronic configuration in the ground states of their atoms: 3d^3, 3d⁵, 3d⁸, 3d⁴?

6. Which one is a stronger reducing agent Cr²⁺ or Fe²⁺? Why.

7. What is lanthanoid contraction? What are the consequences of lanthanoid contraction?

8. What are the characteristics of transition elements and why are they called transition elements? Which of the d – block element may not be regarded as the transition elements?

9. In what way is the electronic configuration of the transition elements different from that of the non – transition elements?

10. Explain giving reasons?

(a) Transition metals and many of their compounds show paramagnetic behaviour

(b) Transition metals have high enthalpy of atomisation.

(c) The transition metals generally form coloured compounds.

(d) Transitional metals and their many compounds act as good catalysis.

11. What are interstitial compounds? Why are such compounds well known for transition metals?

12. How is variability in oxidation states of transition metals different from that of non – transition metals? Illustrate with examples.

13. Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

14. Why Cu⁺ ion is not stable in aqueous solution.

Please click the link below to download pdf file of CBSE Class 12 Chemistry Question Paper SA 2 2013 (1).