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Chemistry

Chemistry
Among the following, carbonate ore of Zinc is

Zincblende
Calamine
Sphalerite
Zincite

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Chemistry
The items amenable to detection by soft x-rays are

lead in bullets
genuine coins from counterfeit coins
contrabands
narcotics

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Chemistry
Solder metal is an alloy of

Copper and tin
Copper and zinc
Lead and antimony
Lead and tin

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Chemistry
The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

helium
oxygen
ozone
methane

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Chemistry
Which is the highest quality of hard coal?

Anthracite
Peat
Lignite
Bituminous

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Chemistry
The total energy of revolving electron in an atom

Will always be positive
Can never be positive
Cannot be negative
Can have any value above zero

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