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Question

Consider the following statements and arrange in the order of true/false as given in the codes.
S1:2Se2Cl2SeCl4+3Se
S2: Dioxides like MnO2,PbO2 do not form H2O2 with dilute acids but they evolve O2 with conc. H2SO4.
S3: Sodium thiosulphate with FeCl3 solution develops a pink or violet colour which soon vanishes.
S4: White precipitate of PbS2O3 gets soluble when boiled with water.

A
F T T T
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B
T F T T
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C
F F T T
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D
T T T F
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Solution

The correct option is C T T T F
S1:Se2Cl2SeCl4+3Se (disproportionation)
S2:2PbO2+2H2SO42PbSO4+2H2O+O2
S3:Fe3++2S2O23[Fe(S2O3)2];Fe+3+[Fe(S2O3)2] (pink or violet) 2Fe2++S4O26(colourless)
S4:PbS2O3+H2OΔPbS(black)+H2SO4.

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