Which of the following salt will give a green colour in fire works?

Which of the following metal will give apple green colour on Busen flame-

Which one of the following cations will give a green coloured ash when a piece of filter paper dipped in a solution containing its salt and Co(NO_(3))_(2) is burned?

Which gives apple green colour in fireworks ?

Which of the following salts are black in colour?

Which of the following salt gives green colour mass in cobalt nitrate charcoal cavity test?

Which of the following salt gives green colour mass in cobalt nitrate/charcoal cavity test?

Which of the following gives green colour to the flame ?

Which of the following salt solutions will be coloured -

Which of the following salt solutions will be coloured?