AP EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
The first ionization enthalpies of \(\mathrm{Na}, \mathrm{Mg}\) and \(\mathrm{Si}\) are respectively 496,737 and \(786 \mathrm{KJ} \mathrm{mol}^{-1}\). What would be the first ionization enthalpy of \(\mathrm{Al}\) in \(\mathrm{KJ} \mathrm{mol}^{-1}\) ?
- A \(450\)
- B \(750\)
- C \(575\)
- D \(800\)
Answer & Solution
Correct Answer
(C) \(575\)
Step-by-step Solution
Detailed explanation
\(\mathrm{Na}, \mathrm{Mg}, \mathrm{Al}\) and \(\mathrm{Si}\) lie in the same period \(\left(3^{\text {rd }}\right.\) period) and therefore the effective nuclear charge increases as \(\mathrm{Na} < \mathrm{Mg} < \mathrm{Al} < \mathrm{Si}\) because of which their ionization…
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