Question

. a. Which zone of the flame does a goldsmith use for melting gold and silver and why?

b. Explain how the use of CNG in automobiles has reduced pollution in our cities?​

Answer 1

Required Solution:-

A) A goldsmith uses the outer part of the candle flame for melting gold and silver.

☆ Because in this zone of flame, the temperature is the highest helping these metals to melt easily$.$

B) Combustion of fuels like petroleum causes the addition of many harmful pollutants like un-burnt carbon, particulate matter and many fume gases enter the air and cause respiratory diseases.

Answer 2

Required answer:-

A) A goldsmith uses the outer part of the candle flame for melting gold and silver.

☆ Because in this zone of flame, the temperature is the highest helping these metals to melt easily..

B) Combustion of fuels like petroleum causes the addition of many harmful pollutants like un-burnt carbon, particulate matter and many fume gases enter the air and cause respiratory diseases.