A) \[{{H}_{2}}S\]
B) \[N{{H}_{3}}\]
C) \[C{{H}_{4}}\]
D) \[C{{O}_{2}}\]
Correct Answer: A
Solution :
Sewage water turns black due to action of\[{{H}_{2}}S{{O}_{4}}\], the elements like lead or radicals of II group. They form black precipitate with\[{{H}_{2}}S\].
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