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Among PbS, CuS, HgS, MnS, Ag(2)S, NiS, C...

Among PbS, CuS, HgS, MnS, `Ag_(2)S`, NiS, CoS, `Bi_(2)S_(3)` and `SnS_(2)`, total number of black coloured sulphides is :

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Knowledge Check

  • Passing H_(2)S gas into a mixture of Mn^(2+), Ni^(2+), Cu^(2+) and Hg^(2+) ions in an acidified aqueous solution precipitates

    A
    MnS and CuS
    B
    NiS and HgS
    C
    MnS and NiS
    D
    CuS and HgS

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    In equalitative analysis, cations of graph II as well as group IV both are precipitated in the form of sulphides. Due to low value of K_(sp) of group II sulphides, group reagent is H_(2)S in the presence of dil. HC1 , and due to high value of K_(sp) of group IV sulphides, group reagent is H_(2)S in the presence of NH_(4)OH and NH_(4)C1 . In a solution containing 0.1M each of Sn^(2+), Cd^(2+) , and Ni^(2+) ions, H_(2)S gas is passed. K_(sp) of SnS = 8 xx 10^(-29), K_(sp) of CdS = 15 10^(-28), K_(sp) of NiS - 3 xx 10^(-21), K_(1) of H_(2)S = 1 xx 10^(-7), K_(2) of H_(2)S = 1 xx 10^(-14) Which of the following sulphides is more soluble in pure water?

    An aqueous solution contains Hg^(2+),Hg_(2)^(2+),Pb^(2+),Ag^(+),Bi_(3+) and Cd^(2+) .Out of these, how many ions will produce white precipitate with dilule HCl ?

    Passing H_(2)S gas into a mixture of Mn^(2+), Ni^(2+), Cu^(2+) and Hg^(2+) ions in an acidified aqueous solution, precipitates :

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    Among [Ag(NH_3)_2]Cl, [Ni(CN)_4]^(2-) and [CuCl_4]^(2-) which remains colourless in aqueous solutions and why? (Atomic number of Ag=47, Ni = 28, Cu= 29).

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