Question

A metallic statue under "acid - rain" attack is turned bluish-green. What can be the probable metal and the ion formed?
A.Probable metal – Cr, Salt formed - $C{r^{2 + }}$
B.Probable metal – Cu, Salt formed - $C{u^{2 + }}$
C.Probable metal – Fe, Salt formed - $F{e^{2 + }}$
D.Probable metal – Zn, Salt formed - $Z{n^{2 + }}$

Answer 1

Hint: Acid rain, also known as acid deposition, is a general term that refers to any kind of precipitation that contains acidic elements, such as sulfuric or nitric acid, which falls to the ground in wet or dry form from the atmosphere. This can involve acidic rain, snow, smoke, hail, or even ashes.

Complete answer:
Acid rain is described as rain or other precipitation that is unusually acidic, meaning it contains high amounts of hydrogen ions (low pH). It has the potential to damage trees, marine animals, and facilities. Sulphur dioxide and nitrogen oxide pollutants react with water molecules in the atmosphere to create acids, resulting in acid rain. Since the 1970s, some countries have worked to reduce the amount of sulphur dioxide and nitrogen oxide released into the atmosphere, with promising effects.
Sulphur dioxide is formed by volcanic eruptions, and nitrogen oxides are produced spontaneously by lightning strikes. Acid rain has been shown to have negative effects on trees, freshwaters, and soils, destroying insect and marine life-forms, peeling wood, deterioration of steel structures and bridges, and weathering of stone buildings and monuments, as well as affecting human health. Copper salts have a blue colour to them. As a result, the metal produced could be copper, and the metal ion could be $C{u^{2 + }}$. The metallic statue turns a bluish green colour as a result of this.
Hence option B is correct.

Note:
When some form of precipitation (rain, snow, etc.) extracts acids from the atmosphere and transports them to the Earth's surface, this is known as wet deposition of acids. This may occur as a result of acids deposited in raindrops (see aqueous phase chemistry above) or as a result of precipitation extracting acids in clouds or below clouds. Wet deposition necessitates the removal of gases as well as aerosols.