The correct answer is: B. Shape
Flocculated particles are particles that have been brought together to form larger aggregates. This can happen through a variety of mechanisms, including chemical reactions, electrostatic attraction, and van der Waals forces. The shape of the flocculated particles will depend on the nature of the particles and the forces that are acting on them. However, the size and weight of the particles will not change.
Option A is incorrect because the size of the particles will not change. Flocculated particles are simply larger aggregates of individual particles. The size of the individual particles will not change, and therefore the size of the flocculated particles will not change either.
Option C is incorrect because the weight of the particles will not change. The weight of a particle is simply the product of its mass and the acceleration due to gravity. The mass of the individual particles will not change, and therefore the weight of the flocculated particles will not change either.
Option D is incorrect because only option B is correct.