Gases and particles which are put into the air or emitted by various sources are called photochemical smog emissions carbon monoxide radon

The correct answer is 'emissions'.

Explanation:

An emission is defined as discharge of something into an open atmosphere especially gas or any radiation.Many toxic gases are released into atmosphere when combustion of fuel takes place in a vehicle. Not only from vehicles but also industries , factories etc also releases toxic gases and into our atmosphere which is one of the main cause of air pollution.

Photo-chemical smog is a type of smog formed when ultraviolet light of sun reacts with nitrogen oxides present in our atmosphere.

Carbon monoxide is a colorless, odorless and poisonous gas one of the air pollutant.

Radon is a radioactive gas woith no color and odor used for treatment of cancer and other diseases.

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

no

sodium is solid at rt