Which one of the following does not exist?
Correct answer: B. HFO2
- A. HBO2
- B. HFO2
- C. H3PO3
- D. HBrO2
Explanation
HBrO2(aq) is bromous acid and HIO2(aq) is iodous acid. Like many of the oxyacids, the molecules of HBrO2 (hydrogen bromite) and HIO2 (hydrogen iodide) are unlikely to exist in nature as they would likely decompose into oxides and water vapour when trying to isolate them from their respective acid solutions.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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