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INTRODUCTION - Chapter 7 - P - Block Elements - Intext Solutions - Ncert Solutions class 12 - Chemistry

Updated On 11-02-2025 By Lithanya


Question 7.1:

Why are pentahalides more covalent than trihalides?

Answer:

In pentahalides, the oxidation state is +5 and in trihalides, the oxidation state is +3. Since the metal ion with a high charge has more polarizing power, pentahalides are more covalent than trihalides.

Question 7.2:

Why is BiH3 the strongest reducing agent amongst all the hydrides of

Group 15 elements?

Answer:

As we move down a group, the atomic size increases and the stability of the hydrides of group 15 elements decreases. Since the stability of hydrides decreases on moving from NH3 to BiH3, the reducing character of the hydrides increases on moving from NH3 to BiH3.