The systematic name of the compound SO3 is determined by the elements present and their oxidation states. Sulphur (S) and three oxygen (O) atoms. Oxygen typically has an oxidation state of -

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5. The systematic name of the compound SO$_3$ is determined by the elements present and their oxidation states. Sulphur (S) and three oxygen (O) atoms. Oxygen typically has an oxidation state of -2. For SO$_3$ to be neutral, the sulphur must have an oxidation state of +6 ($x + 3(-2) = 0 \implies x = +6$). The prefix "tri-" indicates three oxygen atoms. Therefore, the systematic name is Sulphur(VI) trioxide.

The correct option is D.

6. Let's evaluate each statement:

• I. Pests are always found in crops and animals. Pests are organisms that cause damage to crops, livestock, or