Choose the correct statements from the following:
A. $$Mn_2O_7$$ is an oil at room temperature
B. $$V_2O_4$$ reacts with acid to give $$VO_2^{2+}$$
C. CrO is a basic oxide
D. $$V_2O_5$$ does not react with acid
Choose the correct answer from the options given below:

We need to identify the correct statements about transition metal oxides.

Statement A: $$Mn_2O_7$$ is an oil at room temperature.

$$Mn_2O_7$$ (dimanganese heptoxide) is indeed a dark green oily liquid at room temperature. It is the anhydride of permanganic acid ($$HMnO_4$$). Statement A is CORRECT.

Statement B: $$V_2O_4$$ reacts with acid to give $$VO_2^{2+}$$.

$$V_2O_4$$ is essentially $$VO_2$$ (vanadium(IV) oxide). When $$VO_2$$ reacts with acid, it forms the vanadyl ion $$VO^{2+}$$, not $$VO_2^{2+}$$. The reaction is: $$VO_2 + 2H^+ \rightarrow VO^{2+} + H_2O$$. Statement B is INCORRECT.

Statement C: CrO is a basic oxide.

CrO (chromium(II) oxide) is a basic oxide. In general, lower oxidation state oxides of transition metals are basic. CrO dissolves in acids to form $$Cr^{2+}$$ salts: $$CrO + 2HCl \rightarrow CrCl_2 + H_2O$$. Statement C is CORRECT.

Statement D: $$V_2O_5$$ does not react with acid.

$$V_2O_5$$ (vanadium(V) oxide) is amphoteric. It reacts with both acids and bases. With acid: $$V_2O_5 + 6HCl \rightarrow 2VOCl_3 + 3H_2O$$. Statement D is INCORRECT.

The correct statements are A and C only.

The correct answer is Option 2: A and C only.