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 –
(a) proper combustion of fuel
(b) improper cooking of potato curry
(c) improper combustion of fuel
(d) burning of copper vessel
Solution:
(c) Due to incomplete combustion of fuel, copper vessel was getting blackened from outside.