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Megha Taneja
Asked: 2022-11-04T02:57:40+05:30 In:

Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)` Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not .
An aqueous solution contain `Hg^(2+),Hg_(2)^(2+),Pb^(2+)`.THe addition of `2M HCI` will procipitate.
A. `HgCI_(2)`only
B. `PbCI_(2)”only”^(-)`
C. `PbCI_(2)` and `Hg_(3)CI_(2)`
D. `PbCI_(2)` and `CdCI_(2)`

Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)` Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not .
An aqueous solution contain `Hg^(2+),Hg_(2)^(2+),Pb^(2+)`.THe addition of `2M HCI` will procipitate.
A. `HgCI_(2)`only
B. `PbCI_(2)”only”^(-)`
C. `PbCI_(2)` and `Hg_(3)CI_(2)`
D. `PbCI_(2)` and `CdCI_(2)`
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  1. Correct Answer – c
    `2M MCI` is group reagent for reagent for group 1 cation `PbCI_(2)` And `HgCI_(2)` will get precipitated, is their solubility products `(K_(sp))` are less than that of other radical

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Uma Inani
Asked: 2022-11-03T03:10:31+05:30 In:

Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)`. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not .
Which one among the following paires of ions cannot be separated by `H_(2)S` in the presence of dilute hydrochloric acid ?
A. `Bi^(2+),Cd^(2+)`
B. `AI^(2+),Hg^(2+)`
C. `Zn^(3+),Cu^(2+)`
D. `Ni^(2+),Cu^(2+)`

Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)`. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not .
Which one among the following paires of ions cannot be separated by `H_(2)S` in the presence of dilute hydrochloric acid ?
A. `Bi^(2+),Cd^(2+)`
B. `AI^(2+),Hg^(2+)`
C. `Zn^(3+),Cu^(2+)`
D. `Ni^(2+),Cu^(2+)`
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  1. Correct Answer – a
    Both `Bi^(3+) and Cd^(2+)` will be precipitate in `Bi_(2)S_(3)` (black) and `CdS` (yellow) by `H_(2)S` as both low values of `K_(sp)` than `AI^(3+),Zn^(2+) and Ni^(2+)` (as sulphides)

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Dinesh Vohra
Asked: 2022-10-30T13:54:48+05:30 In:

Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)`. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not .
An aqucous solution which is sightly acids contains cattions `Fe^(2+),Zn^(2+) and Cu^(2+)`. THe rengent added in excess to this solution would identify the separate `Fe^(2+)` ion in one step is
A. `2M HCI`
B. `6M NH_(3)`
C. `6M NaOH`
D. `H_(2)S gas `

Cations are classified into varius group on the basis of their behaviour against some reagents .The group reagent used for the classifaction of most common cation are `HCI,H_(2)S,NH_(4)OH,(NH_(4))_(2)CO_(3)`. Classification is based on whether a cation reacts with these reagents by the formation of precipitates or not .
An aqucous solution which is sightly acids contains cattions `Fe^(2+),Zn^(2+) and Cu^(2+)`. THe rengent added in excess to this solution would identify the separate `Fe^(2+)` ion in one step is
A. `2M HCI`
B. `6M NH_(3)`
C. `6M NaOH`
D. `H_(2)S gas `
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  1. Correct Answer – b
    `Fe^(3+) + 3NH_(4)OH rarr Fe(OH)_(3) darr (“reddish brown”) +3NH_(4)^(o+)`
    `Cu^(2+) + 4NH_(3) rarr underset((“blue colour soluble complex”))([Cu(NH_(3))_(4)]^(2+))`
    ` Zn^(2+) + 4NH_(3) rarr underset((“colourless soluble complex”))([Zn(NH_(3))_(4)]^(2+))`

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