Which of the following order is/are correct for acidic nature of oxides ?

L i_{2} O > N a_{2} O > K_{2} O > R b_{2} O

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M g O > C a O > S r O > B a O

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N i O > M g O > S r O > B a O

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A l_{2} O_{3} > M g O > S r O > B a O

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Solution

The correct options are
A $L i_{2} O > N a_{2} O > K_{2} O > R b_{2} O$
B $M g O > C a O > S r O > B a O$
C $N i O > M g O > S r O > B a O$
D $A l_{2} O_{3} > M g O > S r O > B a O$
All the four options are correct. Acids are electron acceptors. Smaller the size, higher is the tendency to gain the electrons since it is nearer to the nucleus.
A) The acidic nature of the alkali metal oxides decreases on moving down the group. The deceasing order is $L i_{2} O > N a_{2} O > K_{2} O > R b_{2} O$ .
B) The acidic nature of alkaline earth metal oxides decreases on moving down the group. The decreasing order is $M g O > C a O > S r O > B a O$ .
C) Th acidic nature of the oxides decreases in the order $N i O > M g O > S r O > B a O$
D)The acidic nature of the oxides decreases in the order $A l_{2} O_{3} > M g O > S r O > B a O$ .

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