Correct option is C
Hydrometer analysis
- A hydrometer is a device used to measure the specific gravity of liquids.
- In hydrometer analysis, the soil under testing is firstly boiled with little distilled water to wet and break up the particles.
- After that, hydrogen peroxide is added to remove any organic material.
- Then the whole mixture is allowed to stand still for a night and then boiled again to remove hydrogen peroxide.
