Question

which of the following processes involve a chemical reaction?
a)storing of oxygen gas under pressure in a gas
b)liquefaction of air
c)keeping petrol in a china dish in the open
d)heating copper wire in presence of air at high temparature

Answer 1

Answer:

b is the answer i think so

Answer 2

Answer:

D) Heating copper wire in presence of air at high temperature

Explanation:

Remaining 3 processes belonging to physical change only. But in th heating of copper wire, some gases are released and this causes chemical reactions. Hence it is a chemical process.

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