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1. Chemical formula for water is
NaAlO2
H2O
Al2O3
CaSiO3
2. Washing soda is the common name for
Sodium carbonate
Calcium bicarbonate
Sodium bicarbonate
Calcium carbonate
3. The hardest substance available on earth is
Gold
Iron
Diamond
Platinum
4. Which of the following metals forms an amalgam with other metals?
Tin
Mercury
Lead
Zinc
5. Bromine is a
black solid
red liquid
colourless gas
highly inflammable gas
6. The variety of coal in which the deposit contains recognisable traces of the original plant material is
bitumen
anthracite
lignite
peat
7. Brass gets discoloured in air because of the presence of which of the following gases in air?
Oxygen
Hydrogen sulphide
Carbon dioxide
Nitrogen
8. Quartz crystals normally used in quartz clocks etc. is chemically
silicon dioxide
germanium oxide
a mixture of germanium oxide and silicon dioxide
sodium silicate
9. Tetraethyl lead is used as
pain killer
fire extinguisher
mosquito repellent
petrol additive
10. Chlorophyll is a naturally occurring chelate compound in which central metal is
copper
magnesium
iron
calcium
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