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Q)

Which of the following statements is not correct ?

$\begin {array} {1 1} (A)\;\text{Zinc is malleable and ductile between 370 k and 420 k} \\ (B)\;\text{Mercury has a regular coefficient of expansion} \\ (C)\;\text{Zinc gets tranished in moist air} \\ (D)\;\text{Pure zinc reacts with water producing $ZnO$ and $H_2$ } \end {array}$

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A)
Answer : Pure zinc reacts with water producing $ZnO$ and $H_2$
Pure zinc does not react with water. However, impure zinc decomposes steam liberating dihydrogen gas.
$Zn + H_2O \rightarrow ZnO+H_2$
$ \qquad (\text{steam})$
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