Which of the following reactions is balanced? A)

Sn2+ + 2Fe3+ → Sn4+ + 2Fe2+

B)

Sn2+ + 2Fe3+ → Sn4+ + Fe2+

C)

Sn2+ + Fe3+ → Sn4+ + Fe2+

D)

2Sn2+ + Fe3+ → 2Sn4+ + Fe2+

A

Sn2+ + 2Fe3+ > Sn4+ + Fe2+

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).