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900 ml of pure & dry O2 is subjected to ...

900 ml of pure & dry `O_2` is subjected to `O_2` silent electric discharge, so that after a time 10 min. volume of ozonized oxygen is found to be 870 ml. Now, average rate of reaction in this interval is (in ml/min)

A

3

B

9

C

90

D

60

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The correct Answer is:
B
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