1)Antibiotics are
a) products of metabolism in bacteria
b) collective name of useful bacteria
c) toxins produced by bacteria
d) drugs manufactured to kill viruses
2) The solubility of a salt in water at 75°C is 155. When 80gm of it's saturated solution of 75°C was cooled at 15°C, 40gm of salt was crystallized out. The solubility of salt at 15°C is:
a)21 b)27.5 c)155 d)None​