Question

Which of the following are formula of methanides? $Be_2C$ $CaC_2$ $Mg_2C_3$ $Al_4C_3$

• A. Only 1 and 4
• B. Only 1 and 2
• C. Only 3 and 4
• D. Only 2 and 4

Answer 1

Answer: (A)

Only 1 and 4

Answer 2

$Be _{2} C +4 H _{2} O \rightarrow 2 Be ( OH )_{2}+ CH _{4}$ $CaC _{2}+2 H _{2} O \rightarrow Ca ( OH )_{2}+ C _{2} H _{2}$ $Mg _{2} C _{3}+4 H _{2} O \rightarrow 2 Mg ( OH )_{2}+ C _{3} H _{4}$ $SiC + H _{2} O {->[\text { above } 1300^{\circ} C \text { temp. }]}SiO _{2}+ CH _{4}$