Question:ক্লিনিক মিকসচার হলো- 

A `K_2Cr_2O_7 + HCI` 

B `K_2Cr_O_7 + H_2SO_4` 

C `K_2Cr_2O_7 + KOH` 

D `KMnO_4 + H_2SO_4` 

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