engineering recuitment PGCIL Junior Technician Trainee (Electrician) Mock Test 2023 Electrician and Wireman Power Systems Earthing
Which chemical is not used to improve soil erosion resistance by soil treatment?
1
Copper sulfate
2
Sulfur hexafluoride (electro-negative)
3
Magnesium sulfate (Epsom salts)
4
Potassium Nitrate