That really depends what is growing in the rotten pear juice. If it contains pathogens, then illness could happen. How sick one gets would again depend on the pathogen and one's susceptibility to the disease.
Bleach
He swallowed him whole, and alive.
A+ She swallowed hot coals she put hot coal in her mouth she swallowed fire
yes because it is toxic gas
Anything dead in a tank will go rotten and poison the water. This could kill all the occupants of the tank. It MUST be removed immediately.
A mixture of lemon juice cannot be used to kill ants.
If they are rotten, why eat them in the first place. You would certainly be very ill and may need to seek medical attention.
yes, the chemicals will kill the chicks if a lot is swallowed.
The acidity of the juice can be harmful to plants. Unlike the advice in the movie "Idiocracy", the sport's drink Brawndo is not what plants crave!
Yes
It will probably kill it, tomato juice is very acidic.
If you swallowed the ant 'whole' without chewing it (to kill it) it 'could' survive in your esophagus, and for a limited time in your stomach (until killed by the gastric acids). During this time it could bite you, yes.