E-PolyLearning

6. Chemical formula for water is
a. NaAlO2
b. H2O
c. Al2O3
d. CaSiO3
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Answer: (b).H2O

7. The gas usually filled in the electric bulb is
a. nitrogen
b. hydrogen
c. carbon dioxide
d. oxygen
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Answer: (a).nitrogen

8. Washing soda is the common name for
a. Sodium carbonate
b. Calcium bicarbonate
c. Sodium bicarbonate
d. Calcium carbonate
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Answer: (a).Sodium carbonate

9. Quartz crystals normally used in quartz clocks etc. is chemically
a. silicon dioxide
b. germanium oxide
c. a mixture of germanium oxide and silicon dioxide
d. sodium silicate
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Answer: (a).silicon dioxide

10. Which of the gas is not known as green house gas?
a. Methane
b. Nitrous oxide
c. Carbon dioxide
d. Hydrogen
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Answer: (d).Hydrogen

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