1. Which one of the following is the most basic? a) MgO b) BaO c) CaO d) SrO ... Answer is b) Explanation: Basic character of oxides of metals increases with increase in electropositive character (ability to loose the electron). Down the group, electropositive character of metal increases as atomic size or atomic radius increaeses due to increase in shells and decrease in effective nuclear charge due to increase in sheilding effect. As Ba is at bottom of these elements, therefore, Ba can loose valence electron easily and hence shows the most electropositive character. So, BaO is the most basic . show Answer 2. Which of the following oxides is amphoteric oxide? a) Na 2 O b) Al 2 O 3 c) MgO d) SO 2 ... Answer is b) Explanation: Amphoteric oxides are compounds which have ability to react as acid and base. Al 2 O 3 can act as an acid and base depending upon the conditions. Therefore, Al 2 O 3 is amphoteric....
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