These substances are called amphoteric.
HI
Substances like antacids contain bases that can quickly bind to excess protons (H+) in the stomach, temporarily neutralizing stomach acid and providing quick relief from acid reflux or heartburn. These substances work by increasing the pH of the stomach, reducing acidity.
Acids, bases, and oxidizing agents are some of the most common types of corrosive chemicals. Acids like sulfuric acid and hydrochloric acid, bases like sodium hydroxide, and oxidizing agents like hydrogen peroxide are examples of corrosive substances that can cause damage on contact with living tissue.
If I read your question correctly the answer is DNA or deoxyribonucleic acid. The reason being that the arrangement of bases in the DNA code for the amino acids that make up the proteins. A section of DNA starting with a "start code" of bases can be read in sets of three. Each set of three bases (e.g. TGG or ATG or ACT) codes individually for an amino acid, much like a recipe. The DNA read from one end to the other is a list of bases that, when connected up, form a protein or proteins.
Polynucleotides
The oxides of tin are amphoteric in nature as SnO, with acid it behaves like a base and with a base like an acid.
Ascorbic acid acts like an acid because it is one.
Detergent solutions are usually slightly basic because they contain surfactants that can act as weak bases.
Because water is amphoteric and acts like a Bronsted-Lowry base when mixed with an acid, it will gain a proton and produce hydronium. This is just as a base gains a proton and forms a conjugate acid.
Am amphoteric substance can react as a base but also as an acid.
No, sulfuric acid is not an amphoteric substance. It is a strong acid and only acts as an acid, donating protons in chemical reactions. Amphoteric substances can act as both acids and bases in different chemical reactions.
Acids or bases change character based on the solution in which they exist. For instance, HCl is a strong acid in water, but is a weak acid when dissolved in glacial acetic acid. This has to do with the proton affinity of the respective acids and bases. So, nitric acid may act as a base when placed in a solvent that has a lower proton affinity, i.e., the nitric acid will accept the proton as a Bronsted-Lowry base. I'm not as familiar with Lewis acids and bases, but Lewis bases donate electron pairs, and Lewis acids accept them. I'm sure there is a circumstance in which nitric acid will donate an electron pair to a Lewis acid.
Corrosive substances can be either acids or bases. Acids like hydrochloric acid and sulfuric acid are corrosive, as are bases like sodium hydroxide and potassium hydroxide. Their corrosive nature is linked to their ability to cause damage to living tissues and materials on contact.
HI
A refrigerator is neutral, neither acid nor base. It does not have a pH level like acids or bases.
Electrolytes can be a combination of both acids and bases. Electrolytes are substances that ionize in water to produce ions that conduct electricity. This can include acids like hydrochloric acid and bases like sodium hydroxide that dissociate into ions in solution.
Yes. When bases are dissociated in water an anion is formed with the formation of a conjugate acid.