A) \[{{H}_{2}}S\]
B) \[C{{O}_{2}}\]
C) \[Cu\]
D) \[{{O}_{2}}\]
Correct Answer: A
Solution :
White lead reacts with \[{{H}_{2}}S\] of the atmosphere and forms lead sulphide which is black in colour. Due to this reason, the surface painted with white lead becomes dark after sometime.
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