<p>Two-dimensional (2D) chromium carbide (Cr₂C) has attracted attention due to its predicted spin-dependent electronic structure and topological properties. Despite the successful synthesis of numerous MXenes, a family of 2D transition-metal carbides and nitrides, experimental isolation of 2D Cr₂C sheets has remained elusive. Here we demonstrate that Cr₂C sheets can be obtained from Cr₂AlC by selectively extracting the Al layer using aqueous phosphoric acid followed by liquid-phase delamination. The weak phosphoric acid suppresses rapid dissolution of both Al and Cr while enabling preferential extraction of Al through selective coordination with dissolved Al³⁺ species into soluble complexes. Unlike previously reported MXenes that typically possess surface-passivating terminations, this approach yields 2D Cr₂C with largely clean, unpassivated surfaces, which remain stable even after prolonged exposure to air, water or heat. Monolayer Cr₂C is characterized by unusual Dirac half-semimetal property, featuring a 2.0-eV band gap in the spin-down channel and Dirac semimetal cone in the spin-up channel. Notably, this Dirac semimetal feature is retained in few layers. Benefiting from its chemically robust clean surface and high Fermi velocity, 2D Cr₂C exhibits electrical conductivity surpassing titanium carbide.</p><p></p>