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{:(,"Column I ",,"Column II"),((A),"Lant...

`{:(,"Column I ",,"Column II"),((A),"Lanthanum",(p),"shows an oxidation state of "+3),((B), "Cerium ",(q),"shows an oxidation state of "+4),((C ),"Thorium ",(r ) , "is a rare earth"),((D ), "Uranium",(s),"is an actinoid"):}`

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Cerium shows oxidation state of +4 because

|{:(,"Column I",,"Column II"),((A),"Adenine",(p),"Purine"),((B),"Thymine",(q),"Pyrimidine"),((C ),"Uracil",(r ),RNA),((D),"Deoxyribose",(s),DNA):}|