Question

Which of the following carbides can be used to prepare methane by its action with water?

• A. Aluminium carbide
• B. Beryllium carbide
• C. Calcium carbide
• D. Silicon carbide

Answer 1

Answer: (A), (B), (D)

Beryllium carbide
Silicon carbide
Aluminium carbide

Reaction of Aluminium carbide with water: $A{l}_4{C}_3+12H_{2}O\to 4Al(OH{)}_3+3C{H}_4$

Reaction of Berrylium carbide with water: $B{e}_{2}C+2H_{2}O\to C{H}_4+Be(OH{)}_2$

Reaction of Calcium carbide with water: $Ca{C}_2+2H_{2}O\to HC\equiv CH+Ca(OH{)}_2$

Reaction of Silicon carbide with water: $SiC+4H_{2}O\to Si(OH{)}_4+C{H}_4$

So, the carbides which produce methane on treatment with water are Aluminium carbide, Beryllium carbide & Silicon carbide.

Hence, Options "A", "B" & "D" are correct answers.