AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure
The correct order of increasing ionic character among \(\mathrm{LiH}, \mathrm{NaH}, \mathrm{KH}, \mathrm{RbH}, \mathrm{CsH}\) is
- A \(\mathrm{LiH} < \mathrm{NaH} < \mathrm{CsH} < \mathrm{KH} < \mathrm{RibH}\)
- B \(\mathrm{LiH} < \mathrm{NaH} < \mathrm{KH} < \mathrm{RibH} < \mathrm{CsH}\)
- C \(\mathrm{PbH} < \mathrm{CsH} < \mathrm{NaH} < \mathrm{KH} < \mathrm{LiH}\)
- D \(\mathrm{NaH} < \mathrm{CsH} < \mathrm{Rb}-\mathrm{H} < \mathrm{LiH} < \mathrm{KH}\)
Answer & Solution
Correct Answer
(B) \(\mathrm{LiH} < \mathrm{NaH} < \mathrm{KH} < \mathrm{RibH} < \mathrm{CsH}\)
Step-by-step Solution
Detailed explanation
According to Fajan's rule, the size of the cations increase down a group and also, the increase in size of an atom increases the ionic molecules formed. Caesium being lowest down the group has most ionic character, followed by rubidium, potassium, sodium and lithium…
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