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Chemistry

Chemistry
Piped Natural Gas (PNG) is used for

Cooking
Welding
Anaesthesia
Mining

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Chemistry
Iron and manganese present as pollutants in water cannot be removed by________

Chlorination
Lime soda process or manganese zeolite process
Oxidation followed by settling and filtration
Ion exchange process

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Chemistry
For a spontaneous chemical process, the free energy change is

Zero
Positive
Negative
Depends on whether the reaction is exothermic or endothermic

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Chemistry
The chemical bahaviour of an atom depends upon

The number of protons in its nucleus
The number of neutrons in the nucleus
The number of electrons orbiting around the nucleus
The number of nucleons in the nucleus

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Chemistry
Which of the following elements is not present in stainless steel?

Tungsten
Nickel
Chromium
Iron

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Chemistry
Nucleons are regarded as composites sub-particles known as

Quarks
Leptons
Photons
Mesons

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