question_answer

Hydrogen reacts with different elements to form variety of hydrides. Their stability depends upon lattice energy and ionic character. Covalent hydride is most common type of hydrides. Find from the following which is polymeric hydride.

A)  \[Ca{{H}_{2}}\]                      

B)  \[{{\operatorname{MgH}}_{2}}\]

C)  \[Ba{{H}_{2}}\]                      

D)  \[{{\operatorname{SrH}}_{2}}\]

Correct Answer: B

Solution :

Polymeric hydrides are formed by elements having electronegativity in the range of 1.4 to 2.0