NCERT Exemplar Solutions
Class 10 - Science - CHAPTER 1: Chemical Reactions and Equations - Multiple Choice QuestionsQuestion 16
Class 10 - Science - CHAPTER 1: Chemical Reactions and Equations - Multiple Choice Questions
Question. 16
Which process involves a chemical reaction?
(a)
Storing O2 at high pressure in a cylinder
(b)
Liquefaction of air
(c)
Keeping petrol in an open dish
(d)
Heating copper wire in air at high temperature
Detailed Answer with Explanation:
Hot copper reacts with oxygen to form copper oxide (chemical change). Others are physical processes.