The formula Al3O2 is incorrect because the charges do not balance. Aluminum typically forms a 3+ cation and oxygen forms a 2- anion. Therefore, the correct formula should be Al2O3.
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The chemical formula i2Ca is incorrect because the element symbol "i" is not recognized in the periodic table. The correct chemical formula for calcium iodide is CaI2, where calcium has a +2 charge and iodine has a -1 charge.
Li = +1; Al = +3; F = -1 but I think your formula is wrong Li3AlF6
cacl2 This refers to Calcium Chloride and is wrong. The actual formula of copper chloride is CuCl2 for cupric chloride and CuCl for cuprous chloride. The formula for urea is NH2CONH2
Proteins are not hydrocarbons. The question likely includes the wrong word (e.g. pentane, propane).
C A: Writing only the chemical symbols without the correct subscript Ca2+: Adding a positive charge without specifying the charge in a chemical formula