What happens when 50 grams of sugar is dissolved in 200 ml of water and a table spoon of yeast is added in a pet jar and kept in a room where the humans sleep?

Answer 1

The sugary solution would start fermenting as the yeast multiplied. Carbon dioxide and alcohol are given off as the waste products of fermentation. Of the amount stated in the question, there would be little danger to anyone sleeping in the same room. As a once keen home wine-maker, it was not unusual for me to have three or four demijohns of fermenting wines in my bedroom, and I survived!