Which of the following is a formula of methanides:
(a) `Be_(2)C`
(b) `CaC_(2)`
(c) `Mg_(2)C_(3)`
(d) `Al_(4)C_(3)`

Options

A. only a,d
B. only a,b
C. only c,d
D. only b,d

Answer

A

Explanation

`Be_(2)C+4H_(2)O to 2Be(OH)_(2)+CH_(4)`
`CaC_(2)+2H_(2)O to Ca(OH)_(2)+C_(2)H_(2)`
`Mg_(2)C_(3)+4H_(2)C_(3)+4H_(2)O to 2Mg(OH)_(2)+C_(3)H_(4)`
`SiC+H_(2)O overset("Above "1300^(@)" C temp")to SiO_(2)+CH_(4)`