Correct Answer: Option D

Explanation

Since element Z has a combining power of 3, the correct formulae will be Z\(_2\)O\(_3\). Which means that Oxygen has a valency of 2. However, as they combine both Z and O will exchange their valencies. i.e Z takes the 2 from O while O takes the 3 from Z. Hence the formula will be Z\(_2\)O\(_3\).

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