Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Chemical Reaction
Which one of the following processes involves chemical reaction?
1
Evaporation of petrol
2
Burning of magnesium ribbon in air
3
Storing of oxygen gas under pressure in a gas cylinder
4
More than one of the above
5
None of the above