E-PolyLearning

1. Conversion of carbonate into oxides and carbon dioxide is called as
a. combustion
b. Thermal decomposition
c. Neutralization
d. Respiration
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Answer: (b).Thermal decomposition

2. Conversion of Copper Hydroxide (Cu(OH)₂) into Copper Oxide (CuO) and water (H₂O) is an example of
a. combustion
b. Thermal decomposition
c. Neutralization
d. Respiration
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Answer: (b).Thermal decomposition

3. In exothermic reactions, final energy content of products
a. is lower than the energy contents of the reactants
b. is higher than the energy contents of the reactants
c. does not depend upon the energy content of the reactants
d. forms highly stable compounds
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Answer: (a).is lower than the energy contents of the reactants

4. Upon heating, sodium nitrate NaNO₃(s) gets converted into
a. sodium oxide
b. nitric acid
c. sodium hydrogen oxide
d. None of Above
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Answer: (d).None of Above

5. LPG is obtained by
a. cooling methane
b. cooling natural gas
c. cooling carbon dioxide
d. cooling nitrous oxide
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Answer: (b).cooling natural gas

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