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JEE Main202127 Aug 2021Evening ShiftChemistrys Block ElementsActual

Choose the correct statement from the following :

Options

  1. ALiF has least negative standard enthalpy of formation among alkali metal fluorides.
  2. BThe standard enthalpy of formation for alkali metal bromides becomes less negative on descending the group.
  3. CThe low solubility of CsI in water is due to its high lattice enthalpy.
  4. DAmong the alkali metal halides, LiF is least soluble in water.

Correct answer

D. Among the alkali metal halides, LiF is least soluble in water.

Step-by-step solution

( 3 ) CsI has less lattice enthalpy. But due to less hydration enthalpy of Cs + ion it is less soluble. ( 4 ) LiF is least soluble in water.

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