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JEE Main20198 Apr 2019Morning ShiftChemistrys Block ElementsActual

The correct order of hydration enthalpies of alkali metal ions is:

Options

  1. AN a + > L i + > K + > R b + > C s +
  2. BN a + > L i + > K + > C s + > R b +
  3. CL i + > N a + > K + > R b + > C s +
  4. DL i + > N a + > K + > C s + > R b +

Correct answer

C. L i + > N a + > K + > R b + > C s +

Step-by-step solution

Hydration Enthalpy ∝ + q .   ( - q   )                                                                           ∝ 1 r + + 1 r - As radius increases enthalpy of hydration decreases so in a group on going from top to bottom hydration enthalpy decreases. L i + >   N a + >   K + >   R b +

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