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Exercise

"Nothing in life is to be feared, it is only to be understood."
- Marie Curie
6. 

Chemical formula for water is

A. NaAlO2B. H2O
C. Al2O3D. CaSiO3

7. 

The gas usually filled in the electric bulb is

A. nitrogen
B. hydrogen
C. carbon dioxide
D. oxygen

8. 

Washing soda is the common name for

A. Sodium carbonate
B. Calcium bicarbonate
C. Sodium bicarbonate
D. Calcium 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

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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