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Element which can show +2, +3, +4, +6 an...

Element which can show `+2, +3, +4, +6` and `+7` oxidation states is

A

Cr

B

Mn

C

Co

D

V

Text Solution

Verified by Experts

The correct Answer is:
C
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The elements of 3d transition series are given as : Sc Ti V Cr Mn Fe Co Ni Cu Zn Answer the following : (i) Write the elements which shows maximum number of oxidation states. Give reason. (ii) Which element has the highest m.p. ? (iii) Which element shows only +3 oxidation state ? (iv) Which element is a strong oxidising agent in +3 oxidation state and why ?

The atomic number of an element which can not show the oxidation state of +3 is-

Knowledge Check

  • The element which shows both positive & negative oxidation state is :

    A
    `Li`
    B
    `Mg`
    C
    `He`
    D
    `H`

  • Sulphur and rest of the elements of group 16 are less electronegative than oxygen, Therefore, their atoms cannot take electrons easily. They can acquire ns^2 np^6 configuration by sharing two electrons with the atoms of other elements and thus, exhibit +2 oxidation state in their compounds. In addition to this, their atoms have vacant d-orbitals in their valence shell to which electrons can be promoted from the p and s-orbitals of the same shell. As a result, they can show +4 and + 6 oxidation states. Like sulphur, oxygen does not show + 4 and +6 oxidation states. The reason is

    A
    That oxygen is a gas while sulphur is a solid
    B
    That oxygen has high ionisatio enthalpies in comparison to sulphur
    C
    That oxygen has high electron affinity in comparison to sulphur
    D
    That oxygen has no d-orbitals in its valence shell.

  • Among the following element which shows shows only 'one' non-zero oxidation state is -

    A
    O
    B
    Half
    C
    Cl
    D
    F

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    Sulphur and rest of the elements of group 16 are less electronegative than oxygen, Therefore, their atoms cannot take electrons easily. They can acquire ns^2 np^6 configuration by sharing two electrons with the atoms of other elements and thus, exhibit +2 oxidation state in their compounds. In addition to this, their atoms have vacant d-orbitals in their valence shell to which electrons can be promoted from the p and s-orbitals of the same shell. As a result, they can show +4 and + 6 oxidation states. Oxygen exhibits +2 oxidation state in

    Mark the element which shows only one oxidation state in its compounds

    The element of Group 16, which never shows negative oxidation state is

    Sulphur and rest of the elements of group 16 are less electronegative than oxygen, Therefore, their atoms cannot take electrons easily. They can acquire ns^2 np^6 configuration by sharing two electrons with the atoms of other elements and thus, exhibit +2 oxidation state in their compounds. In addition to this, their atoms have vacant d-orbitals in their valence shell to which electrons can be promoted from the p and s-orbitals of the same shell. As a result, they can show +4 and + 6 oxidation states. The oxidation state of sulphur in Na_2 S_4 O_6 is

    The element which does NOT show +4 oxidation state is __________.

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