Q. Which pair consists only acidic oxides?
A) ${CrO}_{3},{Mn}_{2}O_{7}$
B) ${ZnO}_{2},\ {Al}_{2}O_{3}$
C) $CaO,\ ZnO$
D) ${Na}_{2}O,\ {Al}_{2}O_{3}$
Explanation
(a)
${CrO}_{3}$and ${Mn}_{2}O_{7}$ are acidic oxide. Since, they react with water and form the acids.
$e.g.,{CrO}_{3} + H_{2}O \longrightarrow H_{2}{CrO}_{4}$
chromic acid
${Mn}_{2}O_{7} + \ H_{2}O \longrightarrow {2HMnO}_{4}$
permanganic acid
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.