Question
How does graphite act as a lubricant?
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$\text{2Pb(NO}_3)_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ \ \ }\text{2PbO}\ +\ 4\text{NO}_2\ +\ \text{O}_2$
$\text{C}_{90}\text{C}_{60}\text{C}_{70}\text{C}_{20}$