What type of chemical substance will be produced if respin, diazepam, codeine, hexobarbitone and morphine are mixed?

A scary one: Why would you be planning to mix these substances? Hoping you're not wanting to use them on yourself or sell them to anyone else. Please remember that there is help if you are addicted, suicidal, or both. Your question indicated that you're in nigeria, and unfortunately i don't know what the equivalent of calling "911" is, in your country.