TS EAMCET · Chemistry · Classification of Elements and Periodicity in Properties
The correct option for the first ionisation enthalpy (in \(\mathrm{kJ} \mathrm{mol}^{-1}\) ) of \(\mathrm{Li}, \mathrm{Na}, \mathrm{K}\) and \(\mathrm{Cs}\) respectively is
- A \(496,520,419,374\)
- B \(374,419,496,520\)
- C \(520,496,419,374\)
- D \(374,419,520,496\)
Answer & Solution
Correct Answer
(C) \(520,496,419,374\)
Step-by-step Solution
Detailed explanation
First ionisation enthalpy increase with smaller size. Li is smallest. So, Li has highest first ionisation enthalpy. \[ \mathrm{Li}>\mathrm{Na}>\mathrm{K}>\mathrm{Cs} \text {. } \]
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