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Assertion Cations of both Cu(II) group a...

Assertion Cations of both `Cu(II)` group and `Fe(III)` group are precipitated by passing `H_(2)S` gas but former in dilute acidic medium while later in dilute alkaline medium.
Reason Sulphides of `Cu(II)` group cations have lower solubility than that of `Fe(III)` group cations.

A

Both assertion and reason are correct and reason is the correct explanation of the assertion

B

Both assertion and reason are correct but reason is not the correct explanation of assertion

C

Assertion is correct but reason is incorrect

D

Assertion is incorrect but reason is correct

Text Solution

Verified by Experts

The correct Answer is:
A
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Why are the group IV cations not precipitated as sulphides on passing H_(2)S gas through group II solution?

Is it necessary to acidify a solution before group II cations are precipitated with H_(2)S ?

Knowledge Check

  • ZnS is not precipitated by passing H_(2)S in acidic medium but CuS is precipitated . The reason for it is

    A
    `K_(sp) CuS lt lt K_(sp) ZnS`
    B
    `K_(sp)CuS gt gt K_(sp) ZnS`
    C
    `K_(p) CuS =K_(sp) ZnS`
    D
    None of these

  • H_(2)S is passed through the solution in an acididc medium to precipitate the sulphides of group II cations, but in an alkaline medium to precipitate the sulphides of group IV cations because:

    A
    the sulphides of group II cations are more soluble than those of group IV cations
    B
    the sulphides of group II cations have lower solubility products than those of group IV cations
    C
    the sulphides of group II cations are soluble in an acidic medium, but those of group IV cations are not
    D
    The sulphides of group IV cations are soluble in an alkaline medium but those of group II cations are not

  • Sometimes yellow turbidity appears while passing H_(2)S gas even in slightly acidic medium in the absence of II group radicals. This is because:

    A
    sulphur is present in the mixture as impurity.
    B
    `IV` group radicals are precipitated as sulphides
    C
    of the oxidation of `H_(2)S` gas by some acid radicals
    D
    `III` group radicals are precipitated as hydroxides.

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