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Yes, hydrogen cyanide.
Yes it is extremely toxic.
...from ashigakari.com ...no, because potassium cyanide can only kill when it is mixed with acid, producing hydrogen cyanide. in case of poisoning, the reaction occurs on digestion.
No. dead is dead.
You are referring to the cyanide that was substituted in Tylenol capsules. The Tylenol did not kill anyone, the cyanide it had been substituted with did.
Zyklon B, a brand name for a form of Hydrogen Cyanide
Hydrogen cyanide or Zyklon B as it was called.
Hydrogen cyanide (HCN) was identified in cigarettes smoke but very probably the concentration is not important for health. Far more significant is the nicotine content of cigarettes. Nicotine is a deadlier posion (by ld50) and is also addictive.
About 150mg of cyanide can kill a 60kg human so about 15g should kill a 6000 kg adult male elephant. The cyanide would kill the elephant in much the same way it kills humans because we are both mammals.
Yes there is cyanide in apple seeds but it would take many to kill you.
Cyanide is highly toxic, wikipedia says 1.5mg per kg body weight. There are lots of antidotes available- if using cyanide in the laboratory it is mandatory to have the antidote close to hand and people need training in how to use it.
Yes it is extremely toxic.