Question

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 –

विकल्प

• proper combustion of fuel

• improper cooking of potato curry

• improper combustion of fuel

• burning of copper vessel

Answer 1

improper combustion of fuel

Explanation - 

Due to incomplete combustion of fuel, copper vessel was getting blackened from outside.