NaCl is a strong electrolyte. It undegoes complete dissociation and form its ions. These ions conduct electricity.
Hence, 0.200 M NaCl solution have higher conductivity in water.
the solution with more number of ions will have the highest conductivity.
here,
a) NaCl -----> Na+ + Cl- ( 2 ions)
b) KBr ----> K+ + Br- ( 2 ions)
c) NaF -----> Na+ + F- ( 2 ions)
d) LiCl ----> Li+ + Cl- ( 2 ions)
e) CaCl2 ----> Ca2+ + 2Cl2 ( 3 ions)
Hence the solution having highest conductivity in water is
(e) CaCl2
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