An element Z has a combining power of 3. Which of the following formulae is correct of its compound?
ZS3
ZSO3
ZS04
Z203
Z3Cl2
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Since the element Z has a combining power of 3, it can combine with three atoms of a monovalent element, two atoms of a divalent element, or one atom of a trivalent element.
Among the given options, only option A, ZS3, satisfies this requirement as it indicates that Z combines with three atoms of sulfur, which is monovalent.
Option B, ZSO3, suggests that Z combines with one atom of sulfur and three atoms of oxygen, which is not possible given Z's combining power of 3.
Option C, ZS04, suggests that Z combines with one atom of sulfur and four atoms of oxygen, which is not possible given Z's combining power of 3.
Option D, Z03, suggests that Z combines with three atoms of oxygen, which is not possible given Z's combining power of 3.
Option E, Z3Cl2, suggests that Z combines with two atoms of chlorine, which is monovalent, and would require a combining power of 2 for Z, which contradicts the given information that Z has a combining power of 3.
Therefore, the correct formula for the compound of element Z is A. ZS3.


