| List-I (Function) | List-II (Organism) |
| (A) Nitrogen fixation (bacterium) | (I) Saccharomyces |
| (B) Phosphorous absorption | (II) Azospirillum |
| (C) Nitrogen fixation (cyanobacterium) | (III) Glomus |
| (D) Ethanol Production | (IV) Oscillatoria |
If 0.01 mol of $\mathrm{P_4O_{10}}$ is removed from 0.1 mol, then the remaining molecules of $\mathrm{P_4O_{10}}$ will be:
An element has two isotopes having atomic masses 10 and 15 u, respectively. If the percent abundance of lighter isotopes is 80%, then the average atomic mass of the element is: