Chemistry

The difference between the highest valency of an element and its active valency is considered as latent valency.

The acids that are 100% decomposed in water are called concentrated acids or strong acids.

The substances with sour taste that turn blue litmus to red and donate hydrogen ion in aqueous solution are called acids.

The attractive force by which the metal atoms are bonded together is called metallic bond. Author’s recommendation

Universal indicator is the mixture of various acid and base indicators. Universal indicator turns to different colours for different values of pH.

A compound is a substance formed when two or more chemical elements are chemically bonded together.

Around the nucleus, there are some circular stable axes on which electron moves around. These are called energy levels or orbit. Author’s recommendation

Negatively charged atoms or radicals are called anion.