Answer
a, b & c have same no. of significant figures
Work Step by Step
a. There are 3 significant figures in 3.44 x 10^-3 and 3 significant figures in 0.0344, hence same
b. There are 2 significant figures in 0.0098 and 2 significant figures in 9.8 x 10^4, hence same
c. There are 2 significant figures in 6.8 x 10^3 and 2 significant figures in 68 000, hence same
d. There are 6 significant figures in 258.000 and 3 significant figures in 2.58 x 10^-2, hence different
