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1. Chlorophyll is a naturally occurring chelate compound in which central metal is
copper
magnesium
iron
calcium
2. Bromine is a
black solid
red liquid
colourless gas
highly inflammable gas
3. Which of the following is a non metal that remains liquid at room temperature?
Phosphorous
Bromine
Chlorine
Helium
4. Chemical formula for water is
NaAlO2
H2O
Al2O3
CaSiO3
5. Which of the following is used as a lubricant?
Graphite
Silica
Iron Oxide
Diamond
6. Quartz crystals normally used in quartz clocks etc. is chemically
silicon dioxide
germanium oxide
a mixture of germanium oxide and silicon dioxide
sodium silicate
7. Tetraethyl lead is used as
pain killer
fire extinguisher
mosquito repellent
petrol additive
8. Which of the following metals forms an amalgam with other metals?
Tin
Mercury
Lead
Zinc
9. The hardest substance available on earth is
Gold
Iron
Diamond
Platinum
10. Brass gets discoloured in air because of the presence of which of the following gases in air?
Oxygen
Hydrogen sulphide
Carbon dioxide
Nitrogen
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