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Pencils are made from ?

Copper
Phosphorous
Graphite
Mercury


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Which of the below is not a green house gas ?

Water vapour
Chlorofluorocarbons
Methane
Hydrogen


The most abundant greenhouse gases in Earth''s atmosphere are Water vapor, Carbon dioxide, Methane, Nitrous oxide, Ozone and Chlorofluorocarbons

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In which variety of coal, the deposit contains recognisable traces of the original plant material

Bitumen
Sub bitumen
Lignite
Peat


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After an iron nail gets rusted, iron oxide is formed

without any increase in the weight of the nail
with change in the colour of the nail
With increase in the weight of the nail
without change in the colour of the nail


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Among the various allotropes of carbon, which of the following statement(s) are true ?

Diamond is the hardest
Graphite is the softest
Both A & B
None of the above


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Potassium nitrate can be used in

Ammunition
Fertiliser
Transport
Glass


Potassium nitrate is a chemical compound with the formula KNO3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−. It occurs as a mineral niter and is a natural solid source of nitrogen. Potassium nitrate is one of several nitrogen-containing compounds collectively referred to as saltpeter or saltpetre.

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Which of the following is most soluble in water

Lime
Sugar
Mercury
Sulphur


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Which is the lightest metal found on earth

Copper
Gold
Lithium
Mercury


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Which metal remain in liquid form under normal conditions

Mercury
Sulphur
Zinc
Carbon


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Which of the following is an element?

Sapphire
Diamond
Ruby
Emerald


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