The law of multiple proportions states that substances combine in predictable portions when excess reactants are used, the excess becomes leftovers when two elements combine, a and b, the ratio of the weight of b combining with a is always a whole number none of the above

answer; talc and gypsum;

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).