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Chemistry

Chemistry
If the sewage is fully oxidized, the nitrogen is in the form of

Ammonia
Nitrites
Nitrates
Nitramines

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Chemistry
Plastic is a type of

Polyester
Polymer
Acrylic
None of these

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Chemistry
Number of neutrons in an atom of hydrogen is

Two
One
Zero
Three

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Chemistry
Maximum permissible concentration of total hardness in drinking water is

50
500
100
200

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Chemistry
Atoms having the same number of protons but different number of neutrons are called :

Higgs-boson
Cations
Anions
Isotopes

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Chemistry
A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed?

From pink to blue-green
From blue to pink
From brown to orange-red
From brown to blue-black

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