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In the form of dichromate, Cr(VI) is a s...

In the form of dichromate, Cr(VI) is a strong oxidising agent in acidic medium but Mo(VI) in `Mo0_(3)` and W(VI) in `W0_(3)` are not because

A

Cr (VI) is more stable than Mo(VI) and W(VI).

B

Mo (VI) and W (VI) are more stable than Cr(VI).

C

Higher oxidation states of heavier members of group-6 of transition series are more stable.

D

Lower oxidation states of heavier members of group-6 of transition series are more satble.

Text Solution

Verified by Experts

The correct Answer is:
B, C
In d-block elements, for heavier elements, the higher oxidation states are more stable. Hence, Mo(VI) and W(VI) are more stable than Cr (VI). That’s why, Cr (VI) in the form of dichromate is a stronger oxidising agent in acidic medium whereas `MoO_(3)` and `WO_(3)` are not.
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Following ions are given : Cr^(2+), Cu^(2+), Cu^(+), Fe^(2+),Fe^(3+),Mn^(3+) Identify the ion which is (i) a strong reducing agent. (ii) unstable in aqueous solution. (iii) a strong oxidising agent. Give suitable reason in each.

Knowledge Check

  • In the form of dichromate , Cr(VI) is a strong oxidising agent in acidic medium but Mo(VI) in MoO_(3) and W(VI) in WO_(3) are not because "…..............." .

    A
    Cr(VI) is more stable than Mo(VI) and W (VI)
    B
    Mo(VI) and W (VI) are more stable than Cr(VI).
    C
    Higher oxidation states of heavier members of group-6 of transition series are more stable.
    D
    Lower oxidation states of heavier members of group -6 of transition series are more stable.

  • In the form of dichromate, Cr(VI) is a strong oxidising agent in acidic medium but Mo(VI) in MoO_(3) and W(VI) and WO_(3) are not because______. (i) Cr (VI) is more stable than Mo(VI) and W (VI). (ii) Mo (Yl) and W(VT) are more stable ll1an Cr(Vl). (ili) Higher oxidation states of heavier members of group-6 of transition series are more stable. (iv) Lower oxidation states of heavier members of group-6 of transition series are more stable.

    A
    (i) and (ii)
    B
    (ii) and (iii)
    C
    (i) and (iv)
    D
    (ii) and (iv)

  • Assertion : Cr(VI) in the form of dichromate in acidic medium is a strong oxidising agent where MoO_3 and WO_3 are not. Reason: In d-block elements higher oxidation states are favoured by heavier members.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true and reason not is the correct explanation of assertion.
    C
    If assertion is trun but reason is false.
    D
    If both assertion and reason are false.

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