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NEET CHEMISTRYOrganic Chemistry – Some Basic Principles and Techniques Easy

Question

The correct order of ionic character among CaH2_2, BeH2_2 and BaH2_2 is:

A

BeH2_2 < CaH2_2 < BaH2_2

B

CaH2_2 < BeH2_2 < BaH2_2

C

BeH2_2 < BaH2_2 < CaH2_2

D

BaH2_2 < BeH2_2 < CaH2_2

Step-by-Step Solution

  1. Periodic Trend: The ionic character of hydrides depends on the electropositive nature of the metal. As we move down Group 2 (Alkaline Earth Metals) from Be to Ba, the atomic size increases and the ionization enthalpy decreases .
  2. Electropositivity: Consequently, the electropositive character increases down the group (Be < Ca < Ba).
  3. Fajan's Rule/Bonding: The compounds of s-block elements are predominantly ionic, with the notable exception of Lithium and Beryllium compounds which are largely covalent due to their small size and high ionization enthalpy . Therefore, BeH2_2 is covalent, while CaH2_2 and BaH2_2 are ionic.
  4. Comparison: Since electropositivity increases from Ca to Ba, the ionic character of the bond M-H increases. Thus, BaH2_2 is more ionic than CaH2_2.
  5. Conclusion: The correct order of increasing ionic character is BeH2_2 < CaH2_2 < BaH2_2.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Organic Chemistry – Some Basic Principles and Techniques . Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYOrganic Chemistry – Some Basic Principles and Techniques correctcharacter

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