Question

Which of the following statements is/are correct?

• A. Aluminium carbide as well as beryllium carbide produce methane gas on treatment with water.
• B. On treatment with water, calcium carbide produces acetylene while magnesium carbide gives propyne.
• C. Calcium carbide has one sigma and two pi bonds
• D. Diamond is thermodynamically more stable than graphite.

Answer 1

Answer: (A), (B), (C)

The correct options are
A Aluminium carbide as well as beryllium carbide produce methane gas on treatment with water.
B On treatment with water, calcium carbide produces acetylene while magnesium carbide gives propyne.
C Calcium carbide has one sigma and two pi bonds

$Ca{C}_2+2H_{2}O\to Ca(OH{)}_2+C_2{H}_{2}B{e}_{2}C+4H_{2}O\to 2Be(OH{)}_2+C{H}_{4}A{l}_4{C}_3+12H_{2}O\to 3C{H}_4+4Al(OH{)}_{3}M{g}_2{C}_3+H_{2}O\to C_3{H}_4+Mg(OH{)}_2$