Regents Chemistry Exam June 2024 Question 7
7 Which formula contains a polyatomic ion?
(1) KCN
(2) K2S
(3) AlBr3
(4) Al2O3
Solution:
Polyatomic ions can be found in Table E on the Reference Table. CN- is a polyatomic ion, called cyanide, and it is a part of KCN. Choice 1 is the correct answer.
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