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Q.

Using dil. HCl, which of the following radical cannot be confirmed

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a

S2−

b

S2O32−

c

CO32−

d

NO2Θ

answer is C.

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Detailed Solution

S2−+2HCl⟶Δ H2S↓+2Cl⊖                           Rotten egg smell                             (Specific smell)S2O32−+2HCl⟶ΔSO2↑+2Cl⊖+S↓+H2O                              Suffocating           Yellow turbidity or                                  smell of                  white turbidity                                    burning sulphurCO32−+2HCl⟶Δ or cold CO2↑+H2O+2Cl⊖                                   Odourless gas evolves                                    with brisk effervescences                                     HCO3⊖ also behave similarly
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