Among the following, total number of compound(s) which reduce(s) the yellow solution of `FeCI_(3)` are:
`{:("Tin(II)chloride",,"potassium iodide",),("hydroxylamine",,"hydrazine sulphate",),("ascorbic acid",,"hydrogen sulphide",),("sulphur dioxide",,"potassium dichromate",),("conc.nitric acid",):}`