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On analysis, a certain compound was found to contain iodine and oxygen 254 gm in the ratio of of iodine and 80 gm of oxygen. The atomic mass of iodine is 127 and that of oxygen is 16. Which of the following is the formula of the compound:
(1) Io
(2) I2
(3) I5 O2
(4) I2 O5
Ans: I2 O5
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