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Explain why transition metals and their ...

Explain why transition metals and their many compounds act as good catalyst.

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In heterogenous catalysis, the reactant species are adsorbed on the calalyst surface and take part in chemical reaction to from the products. These are to be released from the surface or to get dissociated in order to accommodate more reacting species. This is know as desorption. Thus. dusorption is very significant in the catalysed reaction. For more details, consult section 10 (Theory of heterogeneous catalysis).
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Explain why transition metals and their many compounds act as goodd catalyst.

Which of the following statement(s) is/are correct? (A) Transition metals and many of their compounds show paramagnetic behaviour. (B) The enthapies of atomisation of the transition metals are high (B) The transition metals generally form coloured compounds (D) Transition metals and their many compounds act as good catalyst.

(a) Members of second and third transition series exhibit similar atomic radii. Explain. (b) Account for the following: (i) Transition metals and their many compounds act as good catalysts. (ii) Actinoids has greater tendency to form complexes in comparison to Lanthanoids.

Assign reasons for the following : (i) Transition metals and many fo their compounds act as good catalyst. (ii) Transition metals generally from coloured compounds.

(a) How does permanganate solution react with Fe(II) ions? Write balanced ionic equations for the reaction. (b) Why do transition metals and many of their compounds act as good catalysts?

Assign reasons for the following : (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element the actinoid contraction is greater than the lanthanoid contraction. (iv) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) . (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as transition element.

How would you account for the fact that the transition metals and their compounds are found to be good catalysts in many processes?

Give reasons for the following: (a) Transition metals and many of their compounds act as catalysts. (b) Scandium (Z = 21) does not exhibit variable oxidation state and yet it is regarded as a transition element. (c) Write the step involved in the preparation of Na_2CrO_4 from chromite ore.

DINESH PUBLICATION-SURFACE CHEMISTRY -SHORT ASNWER TYPE QUESTIONS
  1. What happens when aeledtric field is applied to colloidal solution ?

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  2. What causes Brownian motion in colloidal despersion ?

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  3. How do emulsifiers stabilise emulsion ? Name two emulsifiers.

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  4. Why are some medicines more effective in the colloidal form ?

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  5. Why does leather get hardened after tanning ?

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  6. Cottrell precipitator acts on which of the following principles ?

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  7. How will you distiguish between dispersed phase and dispersion medium ...

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  8. Hardy-schulze rule sates that :-

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  9. It is difficult to stop bleeding from a cut in human body at high alti...

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  10. Why is Fe(OH)(3) colloid positively charged when prepared by adding Fe...

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  11. Why do physisorption and chemisorption behave differently with rise in...

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  12. What happens when dialysis is prolonged ?

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  13. Why do we store silver chloride in dark coloured bottles?

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  14. In the adsorption of oxalic acid on activated charcoal, the activated ...

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  15. Rivers from land, add minerals to sea water. Discuss how ?

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  16. Write differences between physisorption and chemisorption.

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  17. Explain why transition metals and their many compounds act as good cat...

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  18. What role does adsorption play in heterogeneous catalysis ?

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  19. How does a catalyst work?

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  20. Do the vital functions of the body such as digestion get affected duri...

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