Basicity of orthophosphoric acid is________?
Correct answer: B. 3
- A. 2
- B. 3
- C. 4
- D. 5
Explanation
Orthophosphoric acid, H3PO4, has three ionisable hydrogen atoms attached to oxygen, so its basicity is 3. The likely mistake is choosing 4 by counting all four hydrogen and oxygen-related positions in the formula, although only the three O-H hydrogens can be donated as H+.
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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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