Multiple choice

Which of the following statements is incorrect?

  1. Trihalides of group 15 are more covalent than pentahalides.

  2. PH3 has lower boiling point than NH3.

  3. BiH3 the strongest reducing agent amongst all the hydrides of group 15 elements.

  4. Oxidation state of nitrogen in calcium nitride is - 3.

  5. All group 15 elements are solid at room temperature.
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A Correct answer
Explanation

Pentahalides of group 15 are more covalent than trihalides. The oxidation state of central metal atom in pentahalides is +5 while in trihalide is +3. Since the metal ion with high charge has more polarising power, pentahalides are more covalent than trihalides.

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