Transition Metals Questions Only

TRANSITION METALS

1.      What are transuranics? Why are they so called?

            2. The first ionization  energy of 5d elements are higher than that of 3d and 4d elements Why?

3.      What is the most stable oxidation state for group 14 elements? Why?

4. Write the structures of Cr₂O₇^2-and CrO₄^2-ions.

5. What are misch metals? What is their use?

6. What is lanthanide contraction? What are its consequences?

7. Write two balanced oxidizing reactions of KMnO₄ in acidic medium

8. Write two oxidizing reactions of K₂Cr₂O₇ in acidic medium.

9. What are interstitial compounds? Explain mention their important properties.

            10. What are actinides? Mention two characteristics of actinides.

11.For first row transition metals the E₀ values are

M	V	Cr	Mn	Fe	Co	Ni	Cu
E0	__1.18	_0.91	_1.18	_0.44	_0.28	_0.25	+0.24

       Why this trend is irregular?

12.     Zn,Cd and Hg are volatile metals .Why?

13.    Dichromate ion and chromate ion are inter convertible and their structures are dependant on pH .Explain.

14.    Ni(II) compounds are thermodynamically more stable than Pt(II) compounds while Pt(IV) compounds are more stable than Ni(IV) compounds. Why?

15.     Explain the difference in electronic configurations of Gd (Z=64) and Tb(Z=65)

16.    How many moles of KI is oxidized by (a)1 mole of acidified KMnO₄

                                                                           (b)1 mole of acidified K₂Cr₂O₇?

17.    Among the ions Ag⁺,Co²⁺andTi⁴⁺which one will be coloured in aqueous solution? Why?

        (atomic number :Ag=47,Co=27,Ti=22)

18. Giving reasons indicate which one of the following would be coloured ? Cu+, Vo²+,Sc³⁺,Ni²⁺

19. Write ionic equations for the conversions of

1.      Manganate to permanganate

2.      Permangante to manganese (II)

3.      Chromate to dichromate

   

     20. Why Zr and Hf are difficult to separate ?

21.  Explain the preparation of potassium dichromate from chromite ore.

22.  What are actinides? Discuss briefly their physical and chemical properties.

23.  When bright silver objects is placed in a solution of gold chloride it acquires a golden tinge but nothing happens when it is placed in copper chloride solution ,why?

24.  Explain chromyl chloride test. Write  chemical equation

25.  Explain the preparation of KMnO₄ from pyrolusite  ore. Write chemical equations.

26.  What is the effect of pH on

        a)colour of KMnO₄                          b)colour of K₂Cr₂O₇

                  27. Write the ionic equations for

                         a)reaction of KMnO₄ with oxalic acid

                         b)reaction of KMnO₄ with FeSO₄

                         c)reaction of KMnO₄ with KI          in acidic medium.

                  28. Write ionic equation involved in the reaction of acidified K₂Cr₂O₇ with

                          a) oxalic acid   b)  KI solution    c) FeSO₄

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