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Chemistry

Chemistry
Silicon is used in

Semiconductors
All of these
Solar energy devices
Transistors

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Chemistry
Oxygen which is vital for life is a product of photosynthesis and comes from

Oxides of mineral elements
Carbonates from soil
Water
Carbon dioxide

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Chemistry
Percentage of lead in lead pencils is

31-66
80
40

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Chemistry
The process of removing calcium and magnesium from hard water is known as

Flocculation
Filtration
Sedimentation
Water softening

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Chemistry
One property of ammonia is

It is insoluble in water
It is a yellowish gas
It is a odourless gas
Its aqueous solution turns red litmus blue

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Chemistry
Carbon monoxide is an inflammable gas. Which one of the following is also inflammable?

Nitrogen
Hydrogen
Oxygen
Helium

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