How and under what condition dows `NH_(3)` reacts with cupric oxide?

Under what conditions is Boyle’s law is applicable?

under what conditions do ethers from oxonium salts?

Under what conditions is Coulomb's law valid ?

Under what condition is E_("cell")=0 or Delta_(r)G=0?

under what condition an adiabatic process may become isentropic?

How can you produce nitric oxide from NH_3 ?

Under what conditions, water reacts with calcium cyanamide and what are the products formed due to this reaction?

A black compound of Mn reacts with a halogen acid to form a greenish yellow gas. When NH_(3) reacts with excess of that gas, an unstable trihalide is obtained. The change of oxidation state of nitrogen in this process is -