A1.0 l buffer solution is 0.12 m in hno2 and 0.060 m in kno2. which action destroys the buffer? part a adding 0.060 mol of kno2 adding 0.060 mol of koh adding 0.060 mol of hno3 none of the above

The buffer is NO2- (notice how the acid and conjugative base has same anion) since this a base we will need an acid to destroy as adding more base just allow a higher buffer capacity so the only available option is adding HNO3 as its the only acid.
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The answer to that would be magnesium