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Chemistry

Chemistry
The metal ion present in Vitamin B12 is

Iron
Nickel
Zinc
Cobalt

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Chemistry
The heat energy produced when the human body metabolises 1 gram of fat is

29 KJ
1 KJ
39 KJ
30 KJ

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Chemistry
Galena is a mineral of

Lead
Gold
Iron
Calcium

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Chemistry
Brass is a

Heterogeneous mixture
Compound
Element
Homogeneous mixture

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Chemistry
Which of the following is not a noble gas ?

Argon
Hydrogen
Helium
Neon

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Chemistry
High concentration hydrocarbon pollutants in atmospheric air causes

Silicosis
Cancer
Respiratory diseases (e.g.asthma)
Reduced crop yield

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