1.Copper is an interference of iron determination using the thiocyanate method. Explain the mechanism of interference and suggest a method to overcome the interference.

2.The standard and sample solutions are prepared in 2 M HCl to acidify the sample. Explain if H2SO4can be used instead of HCl .

3.Suggest an alternative complexing agent for spectrophotometric determination of iron

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.