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Chemistry

Chemistry
The number of hydrogen bonds between guanine and cytosine in DNA is

4
2
1
3

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Chemistry
Polythene is polymer of

Aniline
Acetylene
Propylene
Ethylene

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Chemistry
Zinc sulphide is commonly used as

Herbicide
Fungicide
Deodorant
Rodenticide

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Chemistry
The high reactivity of fluorine is due to

its high electro negativity
availability of d-orbitals
strong F - F bond
small size of fluorine atom

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Chemistry
Which of the following is used as a lubricant in heavy machines?

Graphite
Phosphorus
Sulphur
Bauxite

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Chemistry
Ethanol containing 5% water is known as

Methylated alcohol
Denatured spirit
Power alcohol
Rectified spirit

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