Simple Chemical Reactions
At room temperature iron and sulphur
do no react
react
vigorously react
somehow react
do no react
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Fuel obtained from fossils is known asA. decayed animal’s oil
B. decayed plant’s extract
C. fossils fuel
D. crude oil
Power machines in factories and vehicles are examples of
A. 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
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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