Related InterviewSolutions

• A metal nitrate reacts with KI solution to give a block precipitate which on addition of excess of KI solution forms an orange coloured solution. The cation of metal nitrate is :A. `Hg^(2+)`B. `Bi^(3+)`C. `Pb^(2+)`D. `Cu^(2+)`
• A solution of a metal ion when treated with KI solution gives a red precipitate which dissolves in excess of KI solution to give a colourless solution. Moreover, the solution of the same metal ion on treatment with the solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion isA. `Pb^(2+)`B. `Hg^(2+)`C. `Cu^(2+)`D. `Co^(2+)`
• An queous solution of a substance gives a white precipitate on treating with dilute hydrochloric acid which dissolves on heating. When hydrogen sulphide is passed through the hot solution, a black precipitate is obtained. The substance is :A. `Hg^(2+)` saltB. `Cr^(3+)` saltC. `Ag^(+)` saltD. `Pb^(2+)` salt
• A white crystalline salt [A] reacts with dilute HCl to liberate a suffocatig gas [B] and also forms a yellow precipitate. The gas [B] turns potassium dichromatic acidified with dilute `H_(2)SO_(4)` to a green coloured solution [C]. The compound A, B and C are respectivelyA. `Na_(2)SO_(3), SO_(2), Cr_(2)(SO_(4))_(3)`B. `Na_(2)S_(2)O_(3), SO_(2), Cr_(2)(SO_(4))_(3)`C. `Na_(2)S, SO_(2), Cr_(2)(SO_(4))_(3)`D. `Na_(2)SO_(4), SO_(2), Cr_(2)(SO_(4))_(3)`
• A compound is soluble in water. If ammonia is added to aqueous solution of compound, a reddish brown precipitate appears which is soluble in dill. HCl. The compound is a salt of :A. aluminiumB. zincC. ironD. cadmium
• In the second group of qualitative analysis, `H_(2)S` is pass through a solution acidified with HCl in order to :A. limit the concentration of `S^(2-)` ionsB. increase the solubility of `H_(2)S`C. increase the concentration of `S^(2-)` ionsD. provide extra `Cl^(-)` ions
• Dolute nitric acid is generally not used for the preparation of original solution for the basic radicals because it :A. it is a reducing agentB. it is an oxidising agentC. forms insoluble nitratesD. forms soluble nitrates
• Silver, mercury (our) and lead are grouped toether in the same group of qualitative analysis because they form:A. nitratesB. carbonates which dissolve in dill. `HNO_(3)`C. insoluble chloridesD. colourless compounds
• Identify the correct order of solubility of `Na_(2)S, CuS` and ZnS in aqueous solution :A. `CuS gt ZnS gt Na_(2)S`B. `ZnS gt Na_(2)S gt CuS`C. `Na_(2)S gt CuS gt ZnS`D. `Na_(2)S gt ZnS gt CuS`
• A solution which is `10^(-3) M` each in `Mn^(2+), Fe^(2+), Zn^(2+)` and `Hg^(2+)` is treated with `10^(-16) M` sulphide ion. If `K_(sp)` of MnS, FeS, ZnS and HgS are `10^(-15), 10^(-23), 10^(-20)` and `10^(-54)` respectively, which one will precipitate first ?A. FeSB. MgSC. HgSD. ZnS