MCQ
If the valency shell electronic structure for an element is $n{s^2}n{p^5}$, this element will belong to the group of
- AAlkali metals
- BInert metals
- CNoble gases
- ✓Halogens
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$II.$ The ionization energy generally increases with increasing atomic number in a period.
$III.$ The electronegativity of an element is the tendency of an isolated atom to attract an electron.
Which of the above statements is/are correct?
$CH _{2} = C = C H - C H _{3}$
$\quad 1\quad \quad 2\quad \quad 3\quad \quad \quad 4$
molecule, the hybridization of carbon $1,2,3$ and $4$ respectively are :
Which of these structures is practically not a valid canonical structure for formaldehyde ?


| Column $-I$ | Column $-II$ |
| $(A)$ Ionisation potential | $(P)\; O < F < N$ |
| $(B)$ Electronegativity | $(Q)\; N < O < F$ |
| $(C) \;Z_{eff}$ | $(R) \;O < N < F$ |
| $(D)$ Electron affinity | $(S)\; N < C< O$ |