Solution
Latent heat is defined as the heat energy per unit mass required for a phase change:
$$L = \frac{Q}{m}$$
The dimension of heat energy $$Q$$ is $$[ML^2T^{-2}]$$, and mass $$m$$ has dimension $$[M]$$.
Therefore, $$[L] = \frac{[ML^2T^{-2}]}{[M]} = [M^0L^2T^{-2}]$$.
The correct answer is Option 2: $$[M^0L^2T^{-2}]$$.
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