Match the following limit test reagents correctly.
| A) Arsenic | 1) Dithizone |
| B) Lead | 2) Thioglycolic acid |
| C) Iron | 3) Barium chloride |
| D) Barium | 4) Mercuric chloride |
Match the following:
I. True density (P) Reciprocal of bulk density
II. Granule density (Q) Graduated cylinder method
III. Bulk density (R) Helium Pycnometer
IV. Bulkiness (S) Mercury displacement method