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"You cannot shake hands with a clenched fist."
- Indira Gandhi

Chemical formula for water is

A. NaAlO2B. H2O
C. Al2O3D. CaSiO3


The gas usually filled in the electric bulb is

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


Washing soda is the common name for

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


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


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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