Crevice corrosion is a localized form of corrosion which occurs between any two local areas of metal, whenever there is a difference in ionic concentration. Bolt heads are one of the areas, where crevice corrosion takes place.

The term ‘acid rain’ refers to the deposition of wet or dry acidic materials from the atmosphere on the earth’s surface. Smokes emitted from the industries are the major source of sulfur dioxide whereas smokes emitted from the motor vehicle are the major source of nitrogen oxide. These emissions mixed with atmospheric moisture form the sulphuric acid and nitric acids which precipitate on earth in form of Acid rain.

 Acid rain tends to make ocean water acidic which destroys the coral reefs. Coral reefs are tropical rainforest of oceans that capture a huge amount of carbon dioxide thereby combating climate change. The decline in coral reefs may hasten climate change. Acidic conditions affect the reproductive capabilities of fish, resulting in a slow decline in the fish population. This all also reduces biodiversity.

Acid rain results in the shifting of bacterial community to fungal community as bacteria can’t tolerate acidic conditions; hence, Acid Rain increases incidences of fungal diseases.

Each of the two boron atoms in diborane undergoes -hybridization of one 2s and the three 2p orbitals including the empty p-orbital.

Antacids are a group of mild bases that have no toxic effects on the body. Being basic, antacid reacts with an excess of acid in the stomach and neutralizes it. This gives relief to the person concerned. Example: aluminum hydroxide and magnesium hydroxide.

As per the universal indicator, the solution Y will be stronger acid because it turns to red which indicated the pH is 1 and the orange color indicates the value is higher than 1.