Simple Chemical Reactions
Burning of fossils fuel results in the production of
bio gas
oxygen
carbon dioxide
nitrogen
carbon dioxide
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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
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
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