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
Correct Answer: (c) improper combustion of fuel
Explanation: Due to incomplete combustion of fuel, copper vessel was getting blackened from the outside.
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