Q.

Which one of the following oxides is neutral

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a

CO

b

SnO2

c

ZnO

d

SiO2

answer is A.

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Detailed Solution

CO is neutral towards litmus. SnO2​ and ZnO are amphoteric as they form salts and water with acids and bases. SiO2​ is acidic as it forms salts with bases. SiO2​ + 2NaOH →Na2​SiO3​+H2​O.
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