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Chemistry

Chemistry
Among the following, which is always found in free-state in nature?

Sodium
Silver
Gold
Copper

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

narcotics
lead in bullets
contrabands
genuine coins from counterfeit coins

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Chemistry
Which of the following is not a natural source of hydrocarbon?

Natural Gas
Coal
Mica
Petroleum

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Chemistry
Pollutant from motor car exhaust that causes mental disease is

Hg
NO2
Lead
SO2

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Chemistry
Detergents used for cleaning clothes and utensils contain

Bicarbonates
Nitrates
Bismuthates
Sulphonates

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Chemistry
Phosphorus is kept in water because

Its ignition temperature is very high
Its critical temperature is low
Its critical temperature is high
Its ignition temperature is very low

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