Silt in water remains suspended. It is removed by sedimentation and filtration. For increasing its sedimentation aluminium sulphates and calcium hydroxide (slaked lime) are added. As a result sticky aluminium hydroxide.

Destroys slit particles

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Attracts the particles of slit

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Mixes with slit particles

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Makes slit particles increases in size and deposit at the bottom

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Solution

The correct option is B Attracts the particles of slit
The silt in $H_{2} O$ remains suspended. To attract some more silt particles, $A l (O H)_{3}$ is used. It is used to absorb the silt particles and make the liquid more pure.

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