One of the more common mental health issues that affects people with intellectual disabilities is oppositional defiant disorder obsessive-compulsive disorder anxiety disorder violent disorder

One of the more common mental health issues that affects people with intellectual disabilities is Obsessive compulsive disorder.

Explanation:  

"Obsessive compulsive disorder" is very common with people and known to occur popularly in intellectual disable people. There is "lack of communication" with these kind of patient and this in turn makes the child move towards an obsessiveness in nature making it extremely difficult to diagnose especially in young children. It is growing in population and very common in developmental disability. They are common in "behavioural phenotypes", the first symptoms to notice are behavioural change.

                                                        water

a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

                                                        halon  

any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, but now known to damage the ozone layer.

                                                  dry chemical

extinguishing agent used on class a, class b, and class c fires.

                                                  carbon dioxide

a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. it is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.