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JEE Main Chemistry question

ChemistryThe p-Block ElementsJEE Main

How many of the following trends is/are CORRECT with respect to the properties of hydrides of group 15 elements? 1. Basic strength: NH_3 > PH_3 > AsH_3 > SbH_3 \geq BiH_3 2. Thermal stability: NH_3 < PH_3 < AsH_3 < SbH_3 < BiH_3 3. Thermal stability: NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3 4. Boiling point: NH_3 < PH_3 < AsH_3 < SbH_3 < BiH_3

Answer: 2

Solution

(1) Basic strength genuinely decreases down the group (the lone pair becomes more diffuse on larger, less electronegative atoms) — CORRECT. (2) Thermal stability actually decreases (not increases) down the group as the E–H bond weakens with increasing atomic size, so this statement (showing it increasing) is

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Question ID VK-147088