MCQ
Which halogen does not show variable oxidation state
- ✓${F_2}$
- B$C{l_2}$
- C$B{r_2}$
- D${I_2}$
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Reason : $PbCl_4$ is powerful oxidising agent.

$II.$ 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?