Write balanced equations for the reaction of sodium, potassium and calcium on cold water.

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Solution

$N a, K, C a$ react vigorously with water to liberate hydrogen gas forming corresponding hydroxides.
$2 N a_{(s)} + 2 H_{2} O_{(l)} ⟶ 2 N a O H_{(a g)} + H_{2 (a g)} ↑$
$2 K_{(s)} + 2 H_{2} O_{(l)} ⟶ 2 K O H_{(a g)} + H_{2 (g)} ↑$
$C a + 2 H_{2} O_{(l)} ⟶ C a {(O H)}_{2 (a g)} + H_{2 (g)} ↑$

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