The anhydride of HCIO4 is_________________?
Correct answer: D. Cl2O7
- A. Cl2O
- B. Cl2O6
- C. ClO2
- D. Cl2O7
Explanation
The anhydride of an oxyacid is formed by removing water from the acid. For perchloric acid, 2HClO4 loses H2O to give Cl2O7, so the anhydride is dichlorine heptoxide. The likely mistake is Cl2O6 because the subscript 6 resembles the total oxygen count in two acid molecules, but one oxygen is removed with water.
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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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