First slide

Hydrogen

Question

In which of the following hydride law of constant composition does not hold good.

Easy

A

NaH
B

MgH₂
C

LiH
D

ZrH

Solution

Interstitial hydrides [Transition metal hydrides] are non-stoichiometric hydrides. They do not follow the valency rules. The formula of non stoichiometric hydrides do not corresponds to any of the oxidation state of metal.
Zr H1.3 - 1.75 ⇒ Non - stoichiometric hydrides
Zr H⇒ [Kr] 4d2 5s2 ⇒ Zr⁺ H- ⇒ ZrH
                               Zr⁺² +2H- ⇒ ZrH₂
                               Zr⁺³ + 3H- ⇒ ZrH₃
                               Zr⁺⁴ + 4H- ⇒ ZrH₄
The formula of Zirconium hydride should be either ZrH, (or) ZrH2, (or) ZrH3, (or) ZrH4, but its formula is Zr H1.3 - 1.75, i.e., it does not follow the valency neles

$\large \left. \begin{gathered} LiH\; \\ NaH \\ \end{gathered} \right\} \Rightarrow \;Ionic\;hydrides\; \Rightarrow \;Stoichiometric{\text{ }}hydrides$

${MgH}_{2} . . . . . Covalent hydrides . . . . . Stoichiometric hydride$

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