Which of the following pairs of elements and oxidation number is incorrect?
A. Al - 3
B. Sr -2
C. S - 4
D. Tl - 3
Solution:
A. Al - 3 - correct
B. Sr - 2 - correct
C. S - 4 - incorrect
D. Tl - 3 - correct
Answer: C. S - 4
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