Classification Of Elements And Periodicity In Properties Ques 319
Question: Match the correct ionisation enthalpies and electron gain enthalpies of the following elements.
| Elements | $ \Delta H_1 $ $ \Delta H_2 $ $ \Delta e_{g}H $ |
|---|---|
| (A) Most reactive non - metal | (i) 419 3051 - 45 |
| (B) Most reactive metal | (ii) 1681 3374 - 328 |
| (C) Least reactive element | (iii) 738 1451 - 40 |
| (D) Metal forming binary halide | (iv) 2372 5251 +48 |
Options:
A) [A] $ \to $ (ii), [B] $ \to $ (i), [C] $ \to $ (iv), [D] $ \to $ (iii)
B) [A] $ \to $ (i), [B] $ \to $ (ii), [C] $ \to $ (iv), [D] $ \to $ (iii)
C) [A] $ \to $ (i), [B] $ \to $ (iv), [C] $ \to $ (iii), [D] $ \to $ (iv)
D) [A] $ \to $ (ii), [B] $ \to $ (i), [C] $ \to $ (iii), [D] $ \to $ (iv)
Show Answer
Answer:
Correct Answer: A
Solution:
[a] (ii) Is the most reactive non - metal because of its higher IE and $ \Delta e_{g}H $ (i) Is the most reactive metal because of its lowest $ {{1}^{st}} $ IE. [There is a larger difference in $ IE_1 $ and $ IE_2 $ in case of (i)] (iv) Is a least reactive element because of its high IEs and positive $ \Delta e_{g}H $ (iii) Is a bivalent metal because of less difference in $ \Delta H_1 $ and $ \Delta H_2 $ .
