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 Multiple Choice QuestionsShort Answer Type

191.

Why Am and Cm have exceptional configuration in actinoids?

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 Multiple Choice QuestionsLong Answer Type

192. Write the main differences in lanthanides and actinides.
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 Multiple Choice QuestionsShort Answer Type

193. Why the actinoids show more variable oxidation states than lanthanoids?
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194. What is actinoid contraction? How is it different from lanthanoid contraction?
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195. Why are Ni2+ compounds thermodynamically more stable than Pt2+ compounds while Pt4+ compounds are relatively more stable than Ni4+ compounds?
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196. Compare the magnetic behaviour of actinoids with lanthanoids.


The magnetic behaviour of actinoids is more complex and cannot be explained, where for lanthanoids it can be explained and calculated by spin only formula.
Though the magnetic behaviour variation is similar to that of lanthanoids but still lanthanoids have greater magnetic moments.

 
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197.

Compare the chemical reactivity of actinoids with lanthanoids.

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198.

Account for the following facts:
The reduction of a metal oxide is easier if the metal formed is in liquid state at the temperature of reduction.

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199.

Account for the following facts:
The reduction of Cr2O3 with Al is the thermo-dynamically feasible, yet it does not occur at room temperature.

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200.

Account for the following facts:
Pine oil is used in froth floatation process.

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