Teaching Rajasthan 3rd Grade REET Mains (Level I & II) Mock Test General Science Chemistry Chemical Reaction
Which statement is not true?
1
In presences of oxygen, heating zinc oxide when yellow color is found, it is a physical change
2
Swallowing a small glass ball is a chemical change
3
Digesting pure sugar crystal is a chemical change
4
In presence of air, heating mercury when red color is found, it is a chemical change