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Chemistry

Chemistry
Zone refining is used for the purification of

Au
Ge
Cu
Ag

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Chemistry
A mixture of water and alcohol can be separated by

Distillation
Evaporation
Filtration
Decantation

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

genuine coins from counterfeit coins
narcotics
lead in bullets
contrabands

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Chemistry
In galvanization, iron is coated with

Copper
Zinc
Tin
Nickel

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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

methane
oxygen
ozone
helium

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Chemistry
Dry ice is the solid form of :

Air
Nitrogen
Carbon di–oxide
Water

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