SSC MTS EXAM

Detailed explanation-1: -Physical properties include color, density, hardness, and melting and boiling points.

Detailed explanation-2: -Two elements whose names are derived from the color of blue are indium (atomic number 49) and cesium (55). Indium was named after indigo based on the blue color of its emission spectrum, and cesium was named after the Latin caesius, which means sky blue, because it also showed blue emission spectrum.

Detailed explanation-3: -Color is an observable characteristic of matter, therefore, color is a physical property, not a chemical property. Color is observed as the portion of the visible electromagnetic spectrum that is reflected by the substance.