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Which of the following produce Cr(2)O(3)...

Which of the following produce `Cr_(2)O_(3)` along with `O_(2)` ?

A

Heating `(NH_(4))_(2)Cr_(2)O_(7)`

B

Heating `CrO_(3)`

C

Heating `K_(2)Cr_(2)O_(7)`

D

Reaction of `Al_(2)O_(3)` with Cr

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The correct Answer is:
B,C
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