Phosphorus trihalides are readily hydrolysed as shown below:PX3 + 3H2O → H3PO3 + 3HXGenerally moving from fluorine to iodine rate of hydrolysis:
Correct answer: A. Increases
- A. Increases
- B. Decreases
- C. Remains unchanged
- D. First increases and then decreases
Explanation
Down the group, from fluorine to iodine the reactivity increases as the bond energy decreases, making it easier for the phosphorus trihalides to be hydrolysed.
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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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