Brainliest will be awarded..
what is the cause behind the colour change of taj mahal from white to yellowish?

Air Pollution is the cause, air pollutants over the years weathered and eroded the Taj Mahal giving it a different color. But natural discoloration is normal since the Taj Mahal is over 400 years old.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

c, liquids evaporate, creating a gas