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Which among the following are ionic carbides?

1. CaC2
2. Al4C3
3. SiC
4. Be2C

Correct answer: CaC2

Solution

CaC2 (calcium carbide) and Be2C (beryllium carbide) are ionic carbides. Al4C3 is also ionic (methanide type). SiC is a covalent carbide. Among the options, CaC2, Al4C3, and Be2C are ionic carbides, while SiC is not.

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