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JEE Main levelSingle correct optionDifficulty 2 of 3sb045

Assertion (A): Lithium has the most negative standard electrode potential of all alkali metals () even though it has the highest first ionisation enthalpy in the group. Reason (R): The ion has the highest hydration enthalpy in the group.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BBoth A and R are true but R is not the correct explanation of A
  3. CA is true but R is false
  4. DA is false but R is true

Answer: A

reflects the overall change , which includes sublimation, ionisation and hydration. The very high hydration enthalpy of the tiny ion more than offsets its high ionisation enthalpy. So A and R are true and R explains A.
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