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Which of These Substances Is\are Ionic Compound(s)

Question 22

Multiple Choice

Which of these substances is\are ionic compound(s) ?
I. NCl₃
II. MgF₂
III. AlBr₃
IV. CH₄

A) I and II
B) II and III
C) II and IV
D) II, III, and IV
E) II only

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