Ans. Boron compounds are being evaluated for treating arthritis. The alloys of aluminum are used in the construction of aircraft and rockets. Gallium is used to dope semiconductors and for producing solid-state devices. Indium is used in low melting point alloys, making bearing alloys, transistors, thermistors, photoconductors, and rectifiers. Thallium is used in selenium rectifiers, gamma radiation detection equipment, and infrared radiation detection and transmission equipment.