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Chemistry

Chemistry
Which is the purest form of iron?

Cast iron
Wrought iron
Pig iron
Steel

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Chemistry
Milk tastes sour when kept in the open for sometime due to the formation of

Citric acid
Carbonic acid
Lactic acid
Acetic acid

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Chemistry
Which of the following is used to iodise common salt ?

Potassium iodide
Sodium iodide
Potassium iodate
Iodine

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Chemistry
Match the List-I with List-II and select the correct answer using the codes given below the listsList-I (Green house gas)List-II(Major source)F.Carbondioxide1.Enteric fermentation in cattleG.Methane2.Burning of fossilH.Chloroflro carbons3.Mercury compounds in waste waterJ.Nitrous oxide4.Nylon production 5.Air conditioner and refrigeration unitsCodes :FGHJA.2154B.3421C.3241D.1234

D
C
A
B

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Chemistry
Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called

Smoke
Fumes
Aerosols
Mists

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Chemistry
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?

Krypton
Argon
Helium
Neon

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