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Chemistry

Chemistry
Which of the following is ozone depleting pesticide ?

D.T.
Benzene
Ethylene ozonide
Methyl bromide

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Chemistry
What is the covalency of nitrogen in ammonia molecule

4
5
3
2

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Chemistry
Which of the following is used in welding broken pieces of iron rails and machine parts?

Solder
Aluminium sulphate
Aluminium powder
None of these

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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

C
A
B
D

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Chemistry
Which one of the following is not a characteristic feature of alloys? They are

Compounds
Solutions
Homogeneous systems
Mixtures

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Chemistry
Galena is a mineral of

Calcium
Lead
Iron
Gold

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