A sealed glass vial containing a mixture of methane and chlorine gas is kept in a dark room at room temperature. After 24 hours, the vial is moved into direct sunlight, which is rich in ultraviolet (UV) radiation.
What observations are made regarding the colour of the gas mixture in the dark, and then after exposure to the UV radiation?
In the dark: the pale green colour remains. In UV radiation: the pale green colour fades.
In the dark: the pale green colour fades. In UV radiation: the pale green colour remains.
In the dark: the mixture remains colourless. In UV radiation: the mixture turns pale green.
In the dark: the pale green colour remains. In UV radiation: the mixture turns deep orange.
83 exam-style questions on OCR GCSE Chemistry Organic chemistry. Each one has a worked solution and a mark scheme showing where the marks go.