First slide

Periodicity in atomic properties

Question

Which one of the following oxides is neutral

Moderate

A

$CO$
B

${SnO}_{2}$
C

$ZnO$
D

${SiO}_{2}$

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.

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