Classification Of Elements And Periodicity In Properties Question 91
Question: Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides-
Options:
A) $ Al_2O_3<MgO<Na_2O<K_2O $
B) $ Mg,O $ $ <K_2O $ $ < $ $ AI_2O_3 $ $ <Na_2O $
C) $ Na_2O $ $ <K_2O $ $ <MgO $ $ < $ $ AI_2O_3 $
D) $ K_2O $ $ <Na_2O $ $ < $ $ AI_2O_3 $ $ <MgO $
Show Answer
Answer:
Correct Answer: A
Solution:
[a] In a period, the nature of oxides varies from basic to acidic while in a group, basic nature of oxides increases. $ Oxides\underleftarrow{Decreaes} $ In a period, basic nature Changes to acidic nature $ \downarrow $ Basic nature Increases in a group Group 1 2 13 Period 3 $ \to $ $ Na_2O $ $ MgO $ $ Al_2O_3 $(Amphotiric oxide)
Period 4 $ \to $ $ K_2O $ (Strongly basic)
Hence, basic nature of oxides are as follows $ Al_2O_3<MgO<Na_2O<K_2O $
BETA
