Statement I: Zinc oxide is a covalent substance.
Statement II: All oxides are covalent compounds.

Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

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Both the Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

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Statement 1 is correct but Statement 2 is not correct.

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Statement 1 is not correct but Statement 2 is correct.

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Both the Statement 1 and Statement 2 are not correct.

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Solution

The correct option is E Both the Statement 1 and Statement 2 are not correct.
if the difference is < 0.5, it is non polar covalent
if it's between 0.5 and 1.5, it's polar covalent
if it's between 1.5 and 2 and contains a metal, it's ionic,otherwise polar covalent
if it's > 0.2, it's ionic
Zn has EN = 1.65
O has EN = 3.44
difference is 1.79 and it contains a metal, so it's ionic.
Generally, Non metal oxides are covalent in nature whereas metal oxides are usually ionic.
So,both the statements are not correct.

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Statement I: Zinc oxide is a covalent substance.Statement II: All oxides are covalent compounds.

Statement I: Zinc oxide is a covalent substance.
Statement II: All oxides are covalent compounds.