Good Riddles

Question: I died a death that no one has ever died and my grave is in every grocery store.

Question: 12:00 T what does this stand for?

Question: What can you put in your mouth, but not swallow?

Question: There are two doors ten feet apart: One door leads to Heaven, and one door leads to Hell. In between both doors are two guards; one who always tells the truth, and another who always lies. Only these two guards know which door leads to Heaven, and which to Hell. What question can you ask both guards to find out which door leads to Heaven?

Question: you have two liquid substances in a sealed jar one yellow one white, they stay separate even when shaken. When poured out the white substance turns clear what am i?