Almandine is the mineral name of the deep red gemstone known as a garnet, and ha

Question

Almandine is the mineral name of the deep red gemstone known as a garnet, and has the formula Fe_3Al_2(SiO_4)_3, where iron is in the +2 oxidation state. What is the oxidation state of formula Fe oxygen in almandine? A. -2 B. -1 C. -4 D. 0 E. +1 A chemical company uses mercury ions in a production line, and needs to reduce the concentration of toxic Hg^2+ as much as possible before dumping the wastewater. The company decides to try to precipitate the mercury as HgS(s). If the equilibrium concentration of S^2- in the solution is 0.75 M, what is the Hg^2+ concentration in a saturated solution at 25 degree C? The K_sp of HgS is 4.0 times 10^-53 A. 6.3 times 10^-27 M B. 8.4 times 10^-27 M C. 5.3 times 10^-53 M D. 4.0 times 10^-53 M E. 7.1 times 10^-53 M How many electrons are transferred in the following unbalanced redox reaction? Al(s) + Cd(NO_3)_2 (aq) rightarrow Al(NO_3)_3 (aq) + Cd (s) A. 1 B. 2 C. 3 D. 5 E. 6

Explanation / Answer

The general oxidation state of oxygen is -2 except in peroxide (-1) superoxide(-1/2) & in oxygen fluoride.

The given compound is not a peroxide or super oxide or oxygen fluoride ,it's oxidation state is -2.

Therefore option A is correct

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