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Chemistry

Chemistry
The purest form of Iron is :

Wrought iron
Steel
Pig iron
Cast iron

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Chemistry
The method that cannot be used for removing permanent hardness of water is

adding sodium carbonate
boiling
distillation
adding caustic soda

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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

A
D
B
C

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Chemistry
The influence of temperature on reaction rate is predicted by

Lewis equation
Kirchhoff's equation
Arrhenius equation
Van der Waals equation

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Chemistry
The coating of a thin layer of zinc on steel or iron objects is known as

Galvanising
Electroplating
Hot dipping
Tinning

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Chemistry
Name two elements that find wide application in transistor industry

Carbon and Platinum
Tungsten and Platinum
Silicon and Germanium
Iridium and Germanium

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