HI cannot be prepared by the action of conc. H2SO4 on KI because

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HI is stronger than H2SO4

HI is more volatile than H2SO4

H2SO4 is an oxidising agent

H2SO4 forms complex

answer is C.

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Detailed Solution

KI+H2SO4→KHSO4+HIHI is formed but it is further oxidised by conc. H2SO4 into I2 2HI+H2SO4→2H2O+I2VioletVapour+SO2↑

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