Simple Chemical Reactions
Fuel obtained from fossils is known as
decayed animal’s oil
decayed plant’s extract
fossils fuel
crude oil
fossils fuel
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Power machines in factories and vehicles are examples ofA. combustion
B. thermal decomposition
C. evaporation
D. combination
Zinc salt reacts with dilute shulphuric acid to form zinc salt and
A. hydrogen
B. oxygen
C. carbon dioxide
D. carbon monoxide
The process in which reactants react together to form a product, is called
A. chemical reaction
B. chemical change
C. chemical process
D. chemical procedure
At room temperature iron and sulphur
A. do no react
B. react
C. vigorously react
D. somehow react
Irreversible changes include
A. burning of paper
B. rusting of iron
C. corrosion of material
D. all of them
The conservation of mass is obtained when the total mass of reactants is equal to total mass of
A. products
B. molecules
C. protons
D. atoms
The change which is not accompanied by formation of new substance is called a
A. physical change
B. chemical change
C. complex change
D. electrical change
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