Arrange the following oxides in the decreasing order of their acidic strengths.
$I . Z n O$ $I I . K_{2} O$ $I I I . P_{2} O_{5}$ $I V . M g O$

I > I I I > I I > I V

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I I I > I > I V > I I

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I I I > I V > I > I I

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I V > I > I I I > I I

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Solution

The correct option is B $I I I > I > I V > I I$
Since the anions are same, we have to check the charge of the cations. Higher the charge on the cations, acidic nature will be higher. Here $M g^{2 +}$ and $Z n^{2 +}$ having same charge however size of $M g^{2 +}$ is smaller than $Z n^{2 +}$ .
So, the correct of acidic strength is
$P_{2} O_{5} > Z n O > M g O > K_{2} O$
$I I I > I > I V > I I$

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