Suppose that there are typically 20 average-sized drops in 1.0 mL of an aqueous solution.
Will a precipitate form when 1 drop of 0.010 m NaCl(aq) is added to 10.0 mL of
(a) 0.0040 m AgNO3(aq);
(b) 0.0040 m Pb(NO3)2(aq)

answer: i would say b.

explanation:

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

i think   the answer is c hope i'm right

what is the question here. i think you messed up.