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HBr and HI can reduce H2SO4, HCl can reduce KMnO4 and HF can reduce : (A) K2Cr2O7 (B) KMnO4

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HBr and HI can reduce H2SO4, HCl can reduce KMnO4 and HF can reduce : 

(A) K2Cr2O7 

(B) KMnO4 

(C) H2SO4 

(D) none

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(D) none of these

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