Which of the following mixtures is known as chromic acid?
- A$K_2Cr_2O_7$ and conc. $H_2SO_4$
- B$K_2Cr_2O_7$ and $HCl$
- C$K_2SO_4$ and conc. $H_2SO_4$
- D$H_2SO_4$ and $HCl$
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