Question

Which of the following is amphoteric oxide?
$Mn_2O_7$, $CrO_3$, $Cr_2O_3$, $CrO$, $V_2O_5$, $V_2O_4$

• A. $V_2O_5$, $Cr_2O_3$
• B. $Mn_2O_7$, $CrO_3$
• C. $CrO$, $V_2O_5$
• D. $V_2O_5$, $V_2O_4$

Answer 1

Answer: (A)

In chemistry, an amphoteric species is a molecule or ion which can react as an acid as well as a base. This word is derived from the Greek word amphotericin which is meant for "both": Many metals like zinc, tin, lead, aluminium, beryllium, etc formamphoteric oxides or hydroxides.

Here both $V _{2} O _{5}$ and $Cr _{2} O _{3}$ can show the property of acidic as well as basic oxide both. Thus option $A$ is correct.