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(A) +3 oxidation states is characteristi...

(A) +3 oxidation states is characteristic property of lanthanoids but cerium shows + 4 state also
(R) Cerium acquire `4f^0` configuration after loosing one more eletron.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
A
Both (A) and (R) are true and (R) is the correct explanation of (A)
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What the oxidation states of oxygen ? Why does it not show higher oxidation states like + 4 or +5 ?

f-block elements exhibit different oxidation state, colour, complex formation like properties. The size oflanthanides decreases due to poor screening effect of 4f electrons. It is called lanthanide contraction. Lanthanide hydroxides are basic in nature The colour of lanthanide ion is due to

Knowledge Check

  • +2 oxidation state of lead is more stable than +4 , because of

    A
    penetration power
    B
    octet configuration
    C
    inert pair effect
    D
    presence of vacant orbtials

  • +2 oxidation state of lead is more stable than +4 , because of

    A
    penetration power
    B
    octet configuration
    C
    inert pair effect
    D
    presence of vacant orbitals

  • The f-block consists of the two series lanthanoids and actinoids. Because Lanthanum closely resembles the Lanthanoids. The Lanthanoid resemble one another more closely than do the members ofordinary transition elements in any series. They have only one stable oxidation state. The chemistry of the actinoids is on the other hand, much more complicated. The complication arises partly owing to the occurance ofa wide range of oxidation states in these elements and partly because their radioactivity creates special problems in their study Wrong statement of the following is

    A
    Atomic radius of Lanthanoids decreases steadilyfrom Ce to Lu
    B
    The sheilding of a 4f electron by another is less than one d-electron by another with increase in nuclear charge along the series
    C
    Identical radii of Zr and Hf is a consequence of Lanthanoide contraction
    D
    `Ce^(+4)` is a strong oxidising agents

    • Similar Questions

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    f-block elements exhibit different oxidation state, colour, complex formation like properties. The size oflanthanides decreases due to poor screening effect of 4f electrons. It is called lanthanide contraction. Lanthanide hydroxides are basic in nature Ce^(3+),La^(+3),Pm^(3+) and Yb^(+3) have ionic radii in the increasing order as

    Which of the following element does not show an oxidation state of +4 ?

    Which of the following element does not show an oxidation state of +4 ?

    Since all lanthanides and actinides belong to group IIIB or 3rd group they have common oxidation state of +3 as the most stable state. In addition to +3, they also show +2 and +4 states also. M+2 states they are good reducing agents. Actinides show higher oxidation states of +5, +6 and +7. For them +3 state is not the most stable state especially for the flfst four elements Based upon the information above answer the following questions Actinides which show higher uxidastion state +5, +6 and +7 states and respectively are

    Since all lanthanides and actinides belong to group IIIB or 3rd group they have common oxidation state of +3 as the most stable state. In addition to +3, they also show +2 and +4 states also. M+2 states they are good reducing agents. Actinides show higher oxidation states of +5, +6 and +7. For them +3 state is not the most stable state especially for the flfst four elements Based upon the information above answer the following questions Lanthanides which show powerful reducing action in +2 state

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