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Chemistry

Chemistry
The structure of (HPO3)3 is

Linear
Tetrahedral
Octahedral
Cyclic

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Chemistry
Diamond is lustrous because

It is hard
Its refractive index is high
It is colourless
It is pure

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

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Chemistry
The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

oxygen
hydrogen
nitrogen
carbon

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Chemistry
When a nutrient like fertilizer is present in large quantities in a water bodies, plants grow and decay in large numbers because of suffocating of pond that does not leave enough oxygen needed to support life. This type of pollution is called

Green house effect
Smog
None of these
Eutrophication

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Chemistry
Which one of the following does not form oxyacid ?

Sulphur
Chlorine
Nitrogen
Fluorine

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