Why are powdered substances more effective adsorbents than their crystalline forms?

Why are medicines more effective in colloidal state ?

Give reasons why a finely divided substance is more effective as an adsorbent.

Why is thermoregulation more effectively achieved in larger animals than in smaller ones?

The substance that gets adsorbed on the surface of the solid is called

The crystals of compound A on keeping in air get converted into a white powder. Its solution in water gives blue colour with red litmus. It is used to remove permanent hardness of water. Identify the substance. Write chemical formula of its crystalline form.

Why is the closed circulatory system more efficient than the open system?