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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 →Na2SiO3+H2O.