Question

state reason for the following metals are good conductor of heat second hand addition of some silver to pure gold for making ornaments third one inability of non material for displaying hydrogen from dilute sulphuric acid

Answer 1

Metals are good conductors of heat because of following two reasons :
a) Metal ions are closely packed in the metal lattice and thus the transfer of heat from one end to another is more efficient.
b) Availability of free electrons makes transfer of heat easier making it a good conductor of heat.
2.This is so because pure gold i.e. 24carats is very soft if it is served in the same pure form
3.Because of absence of free electrons and high binding energy of non metal.