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Consider the following statements about carbides and choose the correct one(s): (I) CaC2 is an ionic carbide that produces acetylene on hydrolysis. (II) Al4C3 is an ionic carbide that produces methane on hydrolysis. (III) Be2C is an ionic carbide that produces methane on hydrolysis. (IV) SiC is a covalent carbide with an extremely high melting point. Which of the above statements are correct?

1. (A) I and II only
2. (B) I, II and III only
3. (C) I, II, III and IV
4. (D) II, III and IV only

Correct answer: (C) I, II, III and IV

Solution

CaC2 (calcium carbide) is an ionic acetylide: CaC2 + 2H2O -> Ca(OH)2 + C2H2 (acetylene). Al4C3 (aluminum carbide) is an ionic methanide: Al4C3 + 12H2O -> 4Al(OH)3 + 3CH4. Be2C (beryllium carbide) is an ionic methanide: Be2C + 4H2O -> 2Be(OH)2 + CH4. SiC (silicon carbide, carborundum) is a giant covalent structure with a very high melting point (~2730 deg C). All four statements are correct.

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