OnlineCBT
Chemistry · PYQ NEET UG 2023
हिन्दीWhich of the following statements are INCORRECT?\nA. All the transition metals except scandium form \( \text{MO} \) oxides which are ionic.\nB. The highest oxidation number corresponding to the group number in transition metal oxides is attained in \( \text{Sc}_2\text{O}_3 \) to \( \text{Mn}_2\text{O}_7 \).\nC. Basic character increases from \( \text{V}_2\text{O}_3 \) to \( \text{V}_2\text{O}_4 \) to \( \text{V}_2\text{O}_5 \).\nD. \( \text{V}_2\text{O}_4 \) dissolves in acids to give \( \text{VO}^{3-} \) salts.\nE. \( \text{CrO} \) is basic but \( \text{Cr}_2\text{O}_3 \) is amphoteric.\nChoose the correct answer from the options given below :
Correct answer · Option 4
C and D only
Explanation
Basic character decreases as oxidation state increases (V2O3 is basic, V2O4 is amphoteric, V2O5 is acidic). V2O4 dissolves in acids to form VO2+ salts, not VO3-.
