Question

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Answer 1

ans 1 Tyndall effect is in fact the definite test to show the difference between a true and a colloidal solution. it works on the principle that light beams scatter due to the presence of large colloidal particles in the solution which separate the light however in a true solution the particles are not as large enough to scatter the light particles, thats why Tyndall effect is not seen in true solution.
ans 2 The formula for the % calculation:

percentage by mass = mass of solute  x 100% (mass of solute = 60g
                                 mass of solution            mass of solution= 340 +60= 400g)

% concentration = 60/400*100% = 15% answer is 15%

Answer 2

Because a colloidal solution or substance (like fog) is made up of scattered particles (like dust and water in air), light cannot travel straight through. ... The light is not reflected when passing through the water because it is not a colloid.