Question

Reason behind blackened of copper vessel from outside while cooking

Answer 1

black colour traps heat radiations

Answer 2

Shyam was cooking potato curry on a chulha. To his surprise he
observed that the copper vessel was getting blackened from
outside. It may be due to:
(a) proper combustion of fuel.
(b) improper cooking of potato curry.
(c) improper combustion of the fuel.
(d) burning of copper vessel.

I hope you like it if yes then make me as brainlist plz plz plz plz plz