Which of the following carbides librates methane gas by the action of water?
(i) Calcium carbide
(ii) Aluminiun carbide
(iii) Megnesium carbide
(iv) Beryllium carbide

Options

A. (i), (ii)
B. (ii),(iii)
C. (ii),(iv)
D. (iii),(iv)

Answer

C

Explanation

`(Al^(3+))_(4)(C^(4-))_(3)+12overset(delta+)H-overset(delta-)OHrarr3CH_(4)(g)+4Al(OH)_(3)`
`(Be^(2+))_(2)C^(4-)+overset(delta+)(4H)-overset(delta-)(OH)rarrCH_(4)(g)+2Be(OH)_(2)`
`Ca^(2+)(barC-=barC)+2overset(delta+)H-overset(delta-)(OH)rarrCHG-=CH(g)+Ca(OH)_(2)`
`(Mg^(2+))_(2)(C_(3)^(4-))+overset(delta+)(4H)-overset(delta-)(OH)rarr2Mg(OH)_(2)+CH_(3)-C-=CH`