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Answer :
Yes, limestone is dissolving by acid rain.
Calcite dissolves when sulfuric, sulfuric, and nitric acids in polluted air and rain react with calcite in marble and limestone. Exposed areas of buildings and statues show rough surfaces, worn materials, and loss of sculptural detail. Stone face material can be lost anywhere or only in more reactive areas.
Protected areas of stone buildings and monuments can be expected to be immune to acid rain. However, in protected areas of limestone and marble buildings and monuments, detached darkened crust can be seen in some places, exposing the crumbling rock underneath. This black crust is mostly composed of gypsum, a mineral formed from the reaction between calcite, water, and sulfuric acid. Gypsum is water soluble. It can form anywhere on the surface of carbonate stones exposed to sulfur dioxide (SO2) gas, but is usually washed away. It remains only on protected surfaces that are not washed directly by rain.
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