Is there any toxic gas which is odourless?

Answer 1

carbon monoxide - odorless and tasteless

Answer 2

Carbon Monoxide is odourless as is natural gas and Oxygen. The odour in the gas you get at home has to be added so you can smell leaks etc, if it was not then there would be loads of deaths by gassing. Some man made nerve gasses are odourless, this is done so the enemy does not have time to put on protective clothing and respirators, but in the natural world, its just those 2 I think. Chlorine gas is not so much odourless as actually attacks the lungs making it almost impossible to breath so I would assume you would not smell it as such, that was the worse things about submarines, Chlorine gas which was produced when sea water (or the sodium in it) mixed with the battery acid in the wet cell batteries that used to be carried by the submarines. This would produce Chlorine gas which could wipe out a whole ships company in minutes, which was why the depth charge did not have to get a direct hit, just cause enough water to flood the battery rooms.

Answer 3

Ordinary natural gas, that comes out of the pipes, would be odourless. However, a smell is added so that leaks can be detected.

Also, miners used to carry canaries down to the pit face with them. In this manner, if the bird died, you knew that you should leave quickly.

Answer 4

Have you never seen a film or TV show where someone runs a hosepipe from the exhaust pipe into the car or heard about the people with gas fires with the chimney/flue blocked?
Carbon Monoxide.

Answer 5

sure people told you of CO

how about just extra nitrogen
Arsine, diborane are so toxic that when you smell it, it is too late.
Hydrogen sulfide causes you nasal fatigue - you get used to the smell, then it just fades away, until you die

nitrous oxide (laughing gas)
Ethane is an anestethic and odourless

Answer 6

quite a lot... CO2 is odourless and above a concentration of 1.5% is toxic... CO is odourless and toxic.. methane is also odourless and toxic, methane it has when it comes out of your cooker is added so you know if there is a leak.

Answer 7

Carbon Monoxide is a colorless, odorless, tasteless, highly toxic gas that is undetectable to the human senses.

Answer 8

I think Radon is another one which is naturally created in the ground. It is colourless, odourless and tasteless.
Randon sumps are put in to new houses when they are built.
It comes from certain types of rocks underground..

Answer 9

CO, Carbon Monoxide

Answer 10

-CO, as mentioned previously;
-nitric oxide and some other nitrogen oxides;
-methyl bromide (bromomethane);
-BZ (3-quinuclidinyl benzilate; probably caused deaths in Dubrovka theatre in 2002 in Moscow); though others say it was gas with opiates or valium or other;
-other inhalational anaesthetics probably used in surgery and also chemical weapons.

Methane is not toxic, but may cause suffocation when oxygen is lacking - as other odorless non-toxic gases, which we inhale every day.

Answer 11

Main one is CO - carbon monoxide.
Some of the above examples are inaccurate. Carbon dioxide is not toxic - but in quantity will kill you by suffocation.You die from lack of oxygen