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1. It is called calcium carbide( CaC2). It is a hard lump and the
cross section is dark grey or brown.
2. It is lumpy substance, its surface is a little deep gray, has
slight nasty smell.
3. It can produce acetylene gas when met water, it can burn when
meets fire.
4.The acetylene gas mix with air will form explosive gas (explosive
range of acetylene gas in the air is 2.3% - *1%).