The correct order of hydration enthalpies of alkali metal ions is

  • A
    $Li ^{+} > Na ^{+} > K ^{+} > Cs ^{+} > Rb ^{+}$
  • B
    $Na ^{+} > Li ^{+} > K ^{+} > Rb ^{+} > Cs ^{+}$
  • C
    $Na ^{+} > Li ^{+} > K ^{+} > Cs ^{+} > Rb ^{+}$
  • D
    $Li ^{+} > Na ^{+} > K ^{+} > Rb ^{+} > Cs ^{+}$

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