Chemistry
NULL
Medium
Question
Which of the following produces black spots when it comes in contact with organic substances such as skin and cellulose?
A
CuSO4
B
AgNO3
✓ Official correct answer
C
K2MnO4
D
CH3COOH
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A
CuSO4
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B
AgNO3
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C
K2MnO4
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D
CH3COOH
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Explanation
Silver nitrate stains skin and other organic material black, as light and organic reducing agents convert the silver ions to metallic silver.
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