Chemistry - Complete s-block Question with Solution | TestHub
ChemistryComplete s-blocks-block IIAMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
The elements Mg, Cr, Sr and Ba are react with hydrogen to form hydrides ' '. Beryllium hydride is difficult to prepare, and less stable then the others.
Which of the following hydride is polymeric and covalent in nature in solid-
Options:
Answer:
A
Solution:
BeH₂ is covalent and polymeric in the solid state due to the small size and high polarizing power of Be²⁺.
It forms a chain structure with bridging hydrogen atoms (—Be—H—Be—).
SrH₂ and BaH₂ are ionic (saline) hydrides because larger cations have low polarizing power.
Therefore, the hydride which is polymeric and covalent in nature is:
BeH₂
Stream:JEESubject:ChemistryTopic:Complete s-blockSubtopic:s-block IIA
⏱ 2mℹ️ Source: QB
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