An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?
When two elements combine with each other to form compounds, they do so by exchanging their valencies or combining powers. From the question, Z has a combining power of 3, therefore any element it will combine with among the options must have its valency swapped with that of Z. Among the options, only option C is correct because Oxygen has a valency of 2 while Z has valency of 3. As they combine, Z takes the valency of Oxygen which is 2 while Oxygen takes the valency of Z which is 3.
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