JAMB - Chemistry (2004 - No. 13)
Which of the following mixture of gases is likely to burn in flame?
neon and hydrogen
nitrogen and helium
helium and neon
neon and nitrogen
توضیح
When heated, a mixture of hydrogen and neon gases emits light and burns in a flame.When heated, the atoms in the gas absorb energy, causing the electrons to jump to higher energy levels. When the electrons return to their original energy levels, they emit light.
A mixture of helium and nitrogen does not burn in a flame because both helium and nitrogen are non-flammable.
A mixture of helium and neon does not burn in a flame because helium and neon are non-reactive.
A mixture of neon and nitrogen will not burn in a flame because neither neon nor nitrogen are flammable.