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191.

Why Am and Cm have exceptional configuration in actinoids?

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192. Write the main differences in lanthanides and actinides.

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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.

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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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Certain amount of activation energy is essential even for such reactions which are thermodynamically feasible, therefore heating is required.

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200.

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

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