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Taj mahal: a case study - class-V
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The gas which causes yellowing of Tajmahal:
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A
$SO _{2}$
💡 Explanation:
In general, marbles that make palaces, other monuments and forms of architecture, limestone and natural sources of ammonia are severely affected by the action of oxides of sulphur($SO _2$).
The passage of $SO _2$ gas has caused the yellowing of Taj Mahal over these years.