Which compound is responsible for the green - edged flame in a test for borate ion ?

Which compound is responsible for the brown ring obtained in the ring test for nitrate ions ?

Name the compound responsible for the brown ring during the brown ring test of nitrate ion.

Which volatile compound burns with green edged flame ?

Which volatile compound burns with green edged flame ?

In the ring test for identification of nitrate ion, what is the formula of the compound responsible for the brown ring formed at the interface of two liquids ?

While testing borate, green edged flame is due so formation of (a) _____.