First slide

Hydrogen

Question

Alkali metals react with cold water and alkaline earth metals with boiling water to displace

Moderate

A

oxygen
B

hydrogen
C

hydroxide ions
D

all of these

Solution

$2 Na + 2 H_{2} O \to 2 NaOH + H_{2}$
$Mg + 2 H_{2} O \to Mg {(OH)}_{2} + H_{2}$

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