Which of the following mixtures forms chromic acid?
- A$K_2Cr_2O_7 + HCl$
- B$K_2SO_4 + \text{conc. } H_2SO_4$
- C$K_2Cr_2O_7 + \text{conc. } H_2SO_4$
- D$H_2SO_4 + HCl$
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