| 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 |
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)
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 \[{{\text{1}}^{\text{st}}}\]IE. [There is a larger difference in\[I{{E}_{1}}\] and \[I{{E}_{2}}\] 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 \[\Delta {{H}_{2}}\]. |
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