Multiple choice

Alkali metals, alkaline earth metals and lanthanoid metals form ---------------------- carbides.

  1. salt-like

  2. acetylides

  3. sesqui

  4. covalent
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Several carbides are assumed to be salts of the acetylide anion C22- (also called percarbide), which has a triple bond between the two carbon atoms. Alkali metals, alkaline earth metals, and lanthanoid metals form acetylides, e.g., sodium carbide Na2C2, calcium carbide CaC2, and LaC2 Lanthanoids also form acetylides with formula M2C3.

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