All Trends & Exceptions of Inorganic Chemistry for NEET 2025 in 20 Mins by Nitesh Devnani!

All Trends & Exceptions of Inorganic Chemistry for NEET 2025 in 20 Mins by Nitesh Devnani!

Nitesh Devnani Sir helps NEET 2025 students understand important 𝐭𝐫𝐞𝐧𝐝𝐬 𝐚𝐧𝐝 𝐞𝐱𝐜𝐞𝐩𝐭𝐢𝐨𝐧𝐬 𝐢𝐧 𝐈𝐧𝐨𝐫𝐠𝐚𝐧𝐢𝐜 𝐂𝐡𝐞𝐦𝐢𝐬𝐭𝐫𝐲 thoroughly. Here’s what’s covered:

1) 𝐎𝐱𝐢𝐝𝐚𝐭𝐢𝐨𝐧 𝐒𝐭𝐚𝐭𝐞𝐬:
○ Elements in Groups 13 to 16 show 𝐭𝐰𝐨 𝐨𝐱𝐢𝐝𝐚𝐭𝐢𝐨𝐧 𝐬𝐭𝐚𝐭𝐞𝐬: a lower (+1, +2, +3, +4) and a higher (+3, +4, +5, +6).
○ Stability of lower oxidation states 𝐢𝐧𝐜𝐫𝐞𝐚𝐬𝐞𝐬 down the group (due to the 𝐢𝐧𝐞𝐫𝐭 𝐩𝐚𝐢𝐫 𝐞𝐟𝐟𝐞𝐜𝐭), while higher states become less stable.

2) 𝐀𝐭𝐨𝐦𝐢𝐜 𝐑𝐚𝐝𝐢𝐮𝐬:
○ Generally increases down a group, but exceptions occur (e.g., Ga＜Al in Group 13) due to 𝐝-𝐛𝐥𝐨𝐜𝐤 𝐜𝐨𝐧𝐭𝐫𝐚𝐜𝐭𝐢𝐨𝐧 (poor shielding by d-electrons).

3) 𝐈𝐨𝐧𝐢𝐳𝐚𝐭𝐢𝐨𝐧 𝐄𝐧𝐞𝐫𝐠𝐲:
○ Decreases down a group, but exceptions exist (e.g., Be＞B in Group 2) due to stable electron configurations.

4) 𝐃𝐢𝐩𝐨𝐥𝐞 𝐌𝐨𝐦𝐞𝐧𝐭𝐬:
○ 𝐍𝐇₃ has a higher dipole moment than 𝐍𝐅₃ because bond polarities add up in NH₃ but cancel out in NF₃.

5) 𝐄𝐥𝐞𝐜𝐭𝐫𝐨𝐧 𝐆𝐚𝐢𝐧 𝐄𝐧𝐭𝐡𝐚𝐥𝐩𝐲:
○ Decreases down a group, but 𝐨𝐱𝐲𝐠𝐞𝐧 and 𝐟𝐥𝐮𝐨𝐫𝐢𝐧𝐞 have lower values than expected due to small size and electron repulsion.

6) 𝐀𝐜𝐢𝐝𝐢𝐜 𝐒𝐭𝐫𝐞𝐧𝐠𝐭𝐡 & 𝐑𝐞𝐝𝐮𝐜𝐢𝐧𝐠 𝐏𝐨𝐰𝐞𝐫:
○ Depends on bond strength. Weaker bonds (e.g., HI) release H⁺ ions easily, making them 𝐬𝐭𝐫𝐨𝐧𝐠𝐞𝐫 𝐚𝐜𝐢𝐝𝐬 and 𝐛𝐞𝐭𝐭𝐞𝐫 𝐫𝐞𝐝𝐮𝐜𝐢𝐧𝐠 𝐚𝐠𝐞𝐧𝐭𝐬.

7) 𝐌𝐞𝐥𝐭𝐢𝐧𝐠/𝐁𝐨𝐢𝐥𝐢𝐧𝐠 𝐏𝐨𝐢𝐧𝐭𝐬:
○ Generally decrease down a group (e.g., Group 13, 14) but increase for Groups 15–18 due to stronger intermolecular forces.

𝐊𝐞𝐲 𝐓𝐢𝐩𝐬:
● Focus on 𝐫𝐞𝐚𝐬𝐨𝐧𝐢𝐧𝐠 for exceptions (e.g., inert pair effect, d-block contraction).
● Use mnemonics (like "Dhamaal movie" for Group 13 trends) to remember tricky orders.

Nitesh Sir also advises subscribing to the channel for more NEET-focused content and joining the Telegram group for PDF notes.
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