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NEET 2018
Exam
NEET
Year
2018
Subject
Chemistry
Chapter
Chemical Bonding and Molecular Structure

NEET 2018 · Chemistry · Chemical Bonding and Molecular Structure

Among CaH _ 2 , BeH _ 2 , BaH _ 2 , what is the order of ionic...

Among CaH2,BeH2,BaH2,{CaH}_{2}, {BeH}_{2}, {BaH}_{2}, what is the order of ionic character?

Options

  1. ABeH2<BaH2<CaH2{BeH}_{2} < {BaH}_{2} < {CaH}_{2}
  2. BCaH2<BeH2<BaH2{CaH}_{2} < {BeH}_{2} < {BaH}_{2}
  3. CBeH2<CaH2<BaH2{BeH}_{2} < {CaH}_{2} < {BaH}_{2}
  4. DBaH2<BeH2<CaH2{BaH}_{2} < {BeH}_{2} < {CaH}_{2}

Correct answer

C. BeH2<CaH2<BaH2{BeH}_{2} < {CaH}_{2} < {BaH}_{2}

Step-by-step solution

BeH2<CaH2<BaH2{BeH}_{2} < {CaH}_{2} < {BaH}_{2}

The size of the elements follow the order: Be<Ca<BaBe < 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, BeH2{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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