## Answer

Solution A **1.31% (m/v) starch** will decrease in
volume.

Solution D **11.7% NaCl** will increase in volume.

1.
When two solutions are separated by a semi-permeable membrane,
the solvent molecules (water molecules) move across the membrane
from the solution having low concentration of solute to the
solution having high concentration of solute.
Solution A has 1.31% starch and solution B has 7.48 % starch. So
solution B is the solution of higher concentration. As a result,
water molecules will move from solution A to solution B across the
membrane. Hence, the **volume of solution A will
decrease**.
2.

Solution C has 6.75 % NaCl and solution D has 11.7% NaCl. So,
solution D is having higher concentration and water molecules will
move from solution C to solution D. Hence **solution D will
increase in volume**.