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Chemistry

Chemistry
The metal ion present in Vitamin B12 is

Iron
Zinc
Nickel
Cobalt

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Chemistry
Maximum permissible concentration of total hardness in drinking water is

200
500
50
100

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Chemistry
The main constituent of natural gas is

Ethane
Methane
Butane
Propane

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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

B
D
C
A

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Chemistry
Which of the following elements is obtained from sea weeds ?

Vanadium
Iodine
Argon
Sulphur

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Chemistry
Mark the compound which possess ionic, covalent and coordinate bonds.

NH4Cl
SO3
SO2
H2O

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