AP EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
Identify the incorrect order corresponding the mentioned property.
- A \(\mathrm{Al}_2 \mathrm{O}_3 < \mathrm{MgO} < \mathrm{Na}_2 \mathrm{O} < \mathrm{K}_2 \mathrm{O}\) : Basicity
- B \(\mathrm{NH}_3 < \mathrm{PH}_3 < \mathrm{AsH}_3:\) Acidity
- C \(\mathrm{Li}^{+} < \mathrm{Na}^{+} < \mathrm{K}^{+} < \mathrm{Cs}^{+}\): lonic radius
- D \(\mathrm{Li} < \mathrm{Be} < \mathrm{B} < \mathrm{C}\) : First ionisation enthalpy
Answer & Solution
Correct Answer
(D) \(\mathrm{Li} < \mathrm{Be} < \mathrm{B} < \mathrm{C}\) : First ionisation enthalpy
Step-by-step Solution
Detailed explanation
The first ionisation energy generally increases as we move from left to right across a period. This is due to increasing nuclear charge which results in the strong attraction of outermost electron to the nucleus. So, the correct trend of first ionisation enthalpy is…
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