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Question

Which of the following oxides is neutral?


A

ZnO

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B

SnO2

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C

SiO2

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D
CO
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Solution

The correct option is D CO

Clearly, ZnO and SnO2 are amphoteric.

With HCl, Zn forms Zinc (II) chloride. With NaOH, ZnO forms sodium zincate.

Likewise, SnO2 reacts with acid as well as NaOH.

SiO2 reacts with a basic oxide like CaO to form CaSiO3.

Only carbon monoxide is neutral.


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