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Explain why (a) '(Ce4+' is a good oxidis...

Explain why (a) '(Ce4+' is a good oxidistng agent whereas '(Sm2+ is a good reducing agent b) '(La)(OH)_(3)' is stronger base than '(Lu)(OH)_(3)'

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Fa. .+3. is the most stable oxidation state of lanthanide .elements. Hence .(Ce)^(4+). undergoes reduction to .(Ce)^(3+).. Hence it acts as an oxidising agent. .(Sm)^(2). tends to be converted into .(Sm)^(3+). statc. Hence it undergoes oxidation and acts as a reducing agent. b. .(Lu)^(3+). is smaller in size than .(La)^(3+). due to lanthanoid contraction. Due to smaller size of .(Lu)^(3 *)., Lu-O bond in Lu .(OH)_(3) .. Hence removal of .(OH)., be* - comes easy in .(La)(OH)_(3)., Hence .(La)(OH)., is stronger basć than .(Lu)(OH)_(s).
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