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Which of the following is formed when K2...

Which of the following is formed when `K_2Cr_2O_7`, `CaCl_2` and conc.` H_2SO_4` are heated together?

A

`CrCl_3`

B

`Cr_2(SO_4)_3`

C

`CrO_2Cl_2`

D

`K_CrO_4`

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