Lu. c) All the lanthanons are much more reactive than aluminium. d) Ce + solutions are widely used as oxidising agents in volumetric analysis. .
Which of the following lanthanoid ion is diamagnetic? a) Eu + b) Yb + c) Ce + d) Sm + . Which of the following oxidation state is most common among the lanthanoids? a) + b) + c) + d) + .
Assertion : Ce + is used as an oxidizing agent in volumetric analysis. Reason: Ce + has the tendency of attaining + oxidation state. a) Both assertion and reason are true and reason is the correct explanation of assertion. b) Both assertion and reason are true but reason is not the correct explanation of assertion.
c) Assertion is true but reason is false. d) Both assertion and reason are false. . The most common oxidation state of actinoids is a) + b) + c) + d) + .
The actinoid elements which show the highest oxidation state of + are a) Np, Pu ,Am b) U, Fm, Th c) U, Th, Md d) Es, No, Lr XII U4-D-Block-Jerald XII U4-D-Block-Jerald - - - - . Which one of the following is not correct? a) La(OH) is less basic than Lu(OH) b) In lanthanoid series ionic radius of Ln + ions decreases c) La is actually an element of transition metal series rather than lanthanoid series d) Atomic radii of Zr and Hf are same because of lanthanoid contraction Answer the following questions: . What are transition metals?
Give four examples. . Explain the oxidation states of 4d series elements. .
What are inner transition elements? . Justify the position of lanthanoids and actinoids in the periodic table. .
What are actinides? Give three examples. . Describe the preparation of potassium dichromate.
. What is lanthanoid contraction and what are the effects of lanthanoid contraction? . Complete the following a.
MnO H b. C H CH c. MnO → ? ?
acidified KMnO Red hot Fe d. KMnO e. Cr O I H ∆