Question
Name a metal which is so soft that it can be cut with a knife.
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$\text{Pb}(\text{NO}_3)_2(\text{s})\xrightarrow{\ \ \ \ \ {\text{Heat}} \ \ \ \ \ \ }\text{Pb}\text{O}(\text{s})\ +\ \text{NO}_2(\text{g})\ +\ \text{O}_2(\text{g})$
$\text{Na}\ +\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ }\text{Na}_2\text{O}$