A solid which is not transperent to visible light and whose conductivily increase with temperature is formed by

A solid which is transparent to visible light an whose conductivity increases with temperature is formed by ……..

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decrease with temperature and has high melting ponit?

Which one of the following bonds produces a solid taht reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

Which statement concerning visible light is correct ?

The substance whose solubility decreases with increase in temperature

A solid reflects incident light and its electrical conductivity decreases with temperature. The binding in this solids