Classify each chemical equation as a combination/synthesis, decomposition, single replacement , double replacement, or combustion
a. pb(s) + hg2so4 (s) > pbso4(s) +2 hg(i)
b. naci(aq) + agno3(aq) > agci(s) +nano3(aq)
c. 2h20(> 2h2(g) + 02(g)

Lab reagent, hypothesis test.a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl.these six measurements are assumed to be an srs of all possible measurements from solution.they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution.carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.