Unknown organic metal oxide (A) heated with carbon will gives compound (B), which on reaction with water gives ethyne. So what are the compound A and B ?

Unknown organic metal oxide (A) heated with carbon will gives compound

1.	Unknown organic metal oxide (A) heated with carbon will gives compound (B), which on reaction with water gives ethyne. So what are the compound A and B ?
Answer» SOLUTION :`underset("LIME")underset((A))(CaO)+3C overset(-CO)RARR underset("Calcium carbie")underset((B))(CaC_(2))underset(-Ca(OH)_(2))overset(+2H_(2)O)rarr underset("Ethyne")(C_(2)H_(2))`