A commonly used chemical for loading is

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Hydrogen

Alum

Sulphur

Common salt

answer is B.

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Detailed Solution

A commonly used chemical for loading is an alum.
Loading is a method wherein heavy debris settles at the bottom of the box, and water lies above it. Alum is used to speed up the process of loading. Alum reacts with the heavy debris making it settle faster than before. Loading is the method to expedite the sedimentation of finer particles of impurities. At times, we get muddy water in our taps. Mud particles are fine particles of impurities like clay, which remain suspended in water for a long time. A crystalline piece of alum is moved along the surface of muddy water to obtain clean water in a short time. Some alum get dissolved in water. Its particles or molecules get attached to the dust particles, making them heavy. Heavy particles settle down fast. This results in early sedimentation of fine dust particles, leaving clear water above.

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