Question

1) Which chemical is the reason behind the brown colour of human faces?
2) What is sodium carbonate commonly known as?
3) Which metal is used in the making of microchips?
Answer these fast

Answer 1

Bilirubin
Washing soda or soda ash
Silicon
marked it as brainliest

Answer 2

1) Bilirubin is the chemical reason behind the brown colour of human faces.
2) sodium carbonate is commonly known as washing soda.
3)  Silicon is the metal  used in making microchips.
Hope this helps.