% of COHb that can cause death -

Ans. is 'b' i.e., 82 % Symptoms of CO poisoningCOHb%Symptoms0-10%None10-20%Breathlessness on moderate exertion, headache, weakness20-30%Throbbing headache, irritability, defective memory, rapid fatigue30-40%Nausea, vomiting, dizziness, dimness of vision, confusion, cherry red color40-50%Increasing confusion, ataxia, rapid respirations & collapse with attempts at exertion. Symptoms resemble alcohol intoxication50-60%Coma with intermittent convulsions, tachycardia with weak pulse & red discoloration of skin60-70%Increasing depth of coma with incontinence of urine & feces70-80%Profound coma with absent reflexes, thread pulse, shallow' respirations & death>80%Rapid death from respiratory arrest.