(a) For potassium (K), the reaction with water is:
\[ 2 \, \text{K} + 2 \, \text{H}_2\text{O} \rightarrow 2 \, \text{KOH} + \text{H}_2 \]
(b) For calcium (Ca), the reaction with water is:
\[ \text{Ca} + 2 \, \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 +
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