IB Chemistry Test Prep

Category - IB Chemistry

Which of the following pairs of compounds are allotropes?
  1. CO2 and CH4
  2. NH4+ and NH3
  3. NaCl and LiCl
  4. O2 and O3
  5. Ne and Ar
Explanation
Answer: O2 and O3

Allotropy occurs when a single element exists in multiple forms. In the context of this question, only one pair of compounds consists of a single element. Thus, O2 and O3 are an allotropes.
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