241) coaxial cable is one eg. that coems to mind staright away..
8 Answers
12.the metals are identified by the characteristic colour and then further analysis of their ppts which helps in detecting the metal.
5.HgS-cinnabar
CaF2-fluorspar
1ya pritish,you are right.
Nitrous oxide has been used for anesthesia in dentistry since the 1840s. The most common use is as a 50:50 mix with oxygen (commonly known as Entonox or Nitronox) delivered through a demand valve; it is frequently used to relieve pain
courtesy:wikipedia
29Ans 3..the metals which form a black ppt wen H2S is passed through their acidified solution are HgS , CuS , PbS...
Ans 4 Iodine..NCERT Pg 192
