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.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.