Question

The ions present in Al4C3, CaC2 and Mg2C3 are respectively:

• A. C4–, C22–, C34–
• B. C22–, C4–, C34–
• C. C34–, C32–, C4–
• D. C34–, C4–, C22–

Answer 1

Answer: (A)

C4–, C22–, C34–

Answer 2

All compound are ionic carbides.

Al4C3 exists as Al3+ and C4– ; CaC2 exist as Ca2+ and C22– ; similarly Mg2C3 exist as Mg2+ and C34–.