Alcoholic fermentation is brought about the action of -
1). ?yeast
2). $CO_{2}$
3). $O_{2}$
4). CO
1. The noble gas used in radiotherapy is
2. Muscles get tired when there is shortfall of ___________.
3. Which of the following is not a natural source of air pollution ?
4. Bleaching powder is used in drinking water as a an
5. Aqua regia is a 1:3 mixture by volume of
6. Tar roads get damaged if there is
7. A powerful eye irritant present in smog is
8. Bakelite is a co-polymer of Phenol and