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NEET2018ChemistryChemical Bonding and Molecular StructureActual

Among CaH 2 ,   BeH 2 ,   BaH 2 , what is the order of ionic character?

Options

  1. ABeH 2 < BaH 2 < CaH 2
  2. BCaH 2 < BeH 2 < BaH 2
  3. CBeH 2 < CaH 2 < BaH 2
  4. DBaH 2 < BeH 2 < CaH 2

Correct answer

C. BeH 2 < CaH 2 < BaH 2

Step-by-step solution

BeH 2 < CaH 2 < BaH 2 The size of the elements follow the order: Be < Ca < Ba Smaller the size of cation, more will be its polarizing power. Thus, a higher polarization will lead to a greater covalent character, or the least ionic character. Hence, BeH 2 will be least ionic. Top to bottom size of cation increase so covalent character decrease and ionic character increases.

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