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

(a) H2SO4

(b) K2Cr2O7

(c) KMnO4 

(d) none of these

Concept Videos :-

#2 | Oxidising & Reducing Agent
#6 | Balancing of Equation by suing n Factor

Concept Questions :-

Oxidation & Reducing Agents (Oxidation No)
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