Chemistry
Which of the following has no unit

Electronegativity
Electron affinity
Excitation potential
Ionization energy

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Chemistry
What are the components responsible for acid rain?

Sulphur dioxide (SO2) and Nitrogen oxides (NOx)
Carbon dioxide (CO2) and Carbon monoxide (CO)
Nitrogen monoxide (NO) and Carbon monoxide (CO)
Oxides of carbon (COx) and Oxides of nitrogen (NOx)

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