Which of these is the correct sequence of writing the chemical formula

1.	Which of these is the correct sequence of writing the chemical formula?(a) i. ii. iii. iv. (b) i. iii. ii. iv.(C) i. iv. ii. iii.(d) i. iii. iv. ii.
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Which of these is the correct sequence of writing the chemical formula?(a) i. ii. iii. iv. (b) i. iii. ii. iv.(C) i. iv. ii. iii.(d) i. iii. iv. ii.

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