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Chemistry

Chemistry
The most abundant element in the earth’s atmosphere is

Argon
Krypton
Oxygen
Nitrogen

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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
D
B
A

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Chemistry
When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to

SO2
NO2
N2O
SO3

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Chemistry
The greenhouse effect is caused by the higher level of which gas in the atmosphere ?

Carbon monoxide
Sulphur dioxide
Nitrous oxide
Carbon dioxide

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Chemistry
Copper substances when exposed to air gains a green coating due to the formation of:

Cu(NO3)2
CuO
CuCO3 Cu(OH)2
CuSO4

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Chemistry
Which one of the following metals does not react with water to produce Hydrogen ?

Lithium
Cadmium
Sodium
Potassium

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