During an experiment the students prepared three mixtures: A)Starch in water B) Sodium chloride solution C) Tincture of Iodine.

i) Students observed a visible beam of light through mixture A. Why?
ii) Tincture of Iodine did not show Tyndall effect. Explain reason.
iii) How can you relate particle size to the Tyndall effect?

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The correct answer would be b) volume versus temperature, because they are also directly proportional.

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.

The answer would be 25.3