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Give Mond process for refining of nickel...

Give Mond process for refining of nickel.

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Mond's process : Impure Ni is heated in a stream of carbon monoxide `(CO)`, to form gaseous volatile nickel tetra carbonyl complex of nickel `Ni(CO)_(4)`.
`Ni_((s))+4CO_((g))overset(" 330 - 350 K")rarr Ni(CO)_(4(g))`
On heating to `450-470K`, complex decomposes to give pure nickel.
`Ni(CO)_(4(g))overset("405 - 470 K") rarr Ni_((s))+4CO_((g))`
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Describe the principle involved in each of the following processes : Mond's process for refining of nickel.

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Knowledge Check

  • The volatile complex formed in Mond process during refining of nickel is _________.

    A
    `NiCO_(3)`
    B
    `Ni(CO)_(4)`
    C
    `NiSO_(4)`
    D
    `Ni(CN)_(2)`

  • Complexes formed in the following methods are: (I) Mond's process for purification of nickel (II) Removal of unreacted AgBr from photographic plate (III) Removal of lead poisoning from the body

    A
    `{:(I,II,III),(Ni(CO)_(4),[Ag(CN)_(2)]^(-),[Pb(EDTA)]^(2-)):}`
    B
    `{:(I,II,III),(Ni(CO)_(4),[Ag(S_(2)O_(3))_(2)]^(3-),[Pb(EDTA)]^(2-)):}`
    C
    `{:(I,II,III),(Ni(CO)_(6),Ag(S_(2)O_(3))_(2)]^(3-),([Pb(EDTA)]^(4-)):}`
    D
    `{:(I,II,III),(Ni(CO)_(6),[Ag(S_(2)O_(3))]^(-),[Pb(EDTA)]^(2-)):}`

  • Complexes formed in the following methods are: (I) Mond's process for purification of nickel (II) Removal of ureacted AgBr from photographic plate (III) Removal of lead poisoning from the body

    A
    I-`Ni(CO)_(4)`, II- `[Ag(CN)_(2)]^(-)`, III-`[Pb(EDTA)]^(2-)`
    B
    I-`Ni(CO)_(4)`, II-`[Ag(S_(2)O_(3))_(2)]^(3-)`, III-`[Pb(EDTA)]^(2-)`
    C
    I-`Ni(CO)_(6)`, II-`[Ag(S_(2)O_(3))_(2)]^(3-)`, III-`[Pb(EDTA)]^(4-)`
    D
    I-`Ni(CO)_(6)`, II-`[Ag(S_(2)O_(3))]^(-)`, III-`[Pb(EDTA)]^(2-)`

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