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Chemistry

Chemistry
Which of the following is the petroleum wax ?

Carnauba wax
Jojoba wax
Paraffin wax
Bees wax

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Chemistry
The elements with atomic numbers 9, 17, 35, 53, 85 are all

Halogens
Noble gases
Heavy metals
Light metals

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Chemistry
Percentage of carbon in steel ranges from

0.1 to 1.5
1.5 to 3.0
4.0 to 6.0
3.0 to 4.0

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Chemistry
The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of

atomic structure
periodic table of contents
discovery of elements
metallurgy

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Chemistry
Phosphorus is kept in water because

Its ignition temperature is very low
Its critical temperature is high
Its critical temperature is low
Its ignition temperature is very high

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Chemistry
The depletion in Ozone layer is caused by ________ .

Methane
Carbon dioxide
Nitrous oxide
Chlorofluorocarbons

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MORE MCQ ON Chemistry

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