- The electron gain enthalpy of fluorine (\( \text{F} \)) is more negative than that of chlorine (\( \text{Cl} \)), so statement A is correct.
- Ionization enthalpy does decrease as we move down a group in the periodic table, so statement B is correct.
- Electronegativity of an atom is a property of the atom itself and does not depend on the atoms bonded to it, so statement C is incorrect.
- Al$_2$O$_3$ is amphoteric, but NO is a neutral oxide, not amphoteric, so statement D is also incorrect.
Thus, the incorrect statements are C and D.
Choose the correct option
| Molecule | Shape | ||
|---|---|---|---|
| A | \(BrF_5\) | i | T-shape |
| B | \(H_2O\) | ii | See-saw |
| C | \(ClF_3\) | iii | Bent |
| D | \(SF_4\) | iv | Square Pyramidal |
Consider an A.P. $a_1,a_2,\ldots,a_n$; $a_1>0$. If $a_2-a_1=-\dfrac{3}{4}$, $a_n=\dfrac{1}{4}a_1$, and \[ \sum_{i=1}^{n} a_i=\frac{525}{2}, \] then $\sum_{i=1}^{17} a_i$ is equal to
