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#### Transition and Inner Transition Elements - Two Marks Study Materials

12th Standard EM

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 30
15 x 2 = 30
1. What are transition metals? Give four examples.

2. Explain the oxidation states of 3d series elements.

3. What are inner transition elements?

4. Justify the position of lanthanides and actinides in the periodic table.

5. What are actinides? Give three example

6. Why Gd3+ is colourles?

7. Explain why compounds of Cu2+ are coloured but those of Zn2+ are colourless.

8. Describe the preparation of potassium dichromate.

9. What is lanthanide contraction and what are the effects of lanthanide contraction?

10. complete the following.
a. MnO42- + H+ ⟶|?
b. C6H5CH3 $\overset { acidified }{ \underset { KMnO_{ 4 } }{ \longrightarrow } }$?
c. MnO4- + Fe2+ ⟶?
d. KMnO4 $\overset { \triangle }{ \underset { Red\quad hot }{ \longrightarrow } }$ ?
e. Cr2O72- + I- + H+ ⟶?
f. Na2Cr2O7 + KCl ⟶?

11. Orange colour of Cr2O72- ion charges to yellow in alkali and yellow solution turns out orange on adding H+ ions. Explain why?

12. Many industrial processes use transition metal or their compounds as catalyst. Why?

13. What is an alloy? Giv.ean example.

14. What are the conditions for alloy formation?

15. Write the equation for the action of heat on KMnO4