01Easy158×since 2002Q804The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is because :Athe 5f orbitals are more buried than the 4f orbitalsBthere is a similarity between 4f and 5f orbitals in their angular part of the wave functionCthe actinoids are more reactive than the lanthanoidsDthe 5f orbitals extend further from the nucleus than the 4f orbitalsCheck answerSkip
02Easy158×since 2002Q805Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :A4f orbitals more diffused than the 5f orbitalsBlesser energy difference between 5f and 6d than between 4f and 5d orbitalsCmore energy difference between 5f and 6d than between 4f and 5d orbitalsDmore reactive nature of the actinoids than the lanthanoidsCheck answerSkip
03Easy158×since 2002Q806Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?ABecause of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.BThe ionic sizes of Ln (III) decrease in general with increasing atomic number.CLn (III) compounds are generally colourlessDLn (III) hydroxides are mainly basic in character.Check answerSkip
04Medium158×since 2002Q810The highest possible oxidation states of uranium and plutonium, respectively are :A4 and 6B6 and 4C7 and 6D6 and 7Check answerSkip
05Easy158×since 2002Q811The maximum number of possible oxidation states of actinoides are shown by :Anobelium (No) and lawrencium (Lr)Bactinium (Ac) and thorium (Th)Cneptunium (Np) and plutonium (Pu)Dberkelium (Bk) and californium (Cf)Check answerSkip
06Easy158×since 2002Q812The correct order of atomic radii is :AHo > N > Eu > CeBCe > Eu > Ho > NCN > Ce > Eu > HoDEu > Ce > Ho > NCheck answerSkip
07Easy158×since 2002Q813The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :Aincrease in atomic radii and decrease in ionic radiiBincrease in both atomic and ionic radiiCdecrease in both atomic and ionic radiiDdecrease in atomic radii and increase in ionic radiiCheck answerSkip
09Easy158×since 2002Q815The elements with atomic numbers 101 and 104 belong to, respectively :AGroup 6 and ActinoidsBActinoids and Group 4CGroup 11 and Group 4DActinoids and Group 6Check answerSkip
10Easy158×since 2002Q816The correct electronic configuration and spin-only magnetic moment (BM) of Gd³⁺ (Z = 64), respectively, are :A[Xe]5f⁷ and 8.9B[Xe]4f⁷ and 7.9C[Xe]5f⁷ and 7.9D[Xe]4f⁷ and 8.9Check answerSkip