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Chemistry

Chemistry
What is the chemical symbol of mercury

Mg
Hg
None of these
Mr

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

2
4
1
3

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Chemistry
Food cans are coated with tin and not with zinc because

Zinc has a higher melting point than tin
Zinc is costlier than tin
Zinc is more reactive than tin
Zinc is less reactive than tin

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Chemistry
Which one of the following mineral does not contain oxygen ?

Calcite
Haematite
Bauxite
Cryolite

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Chemistry
Which metal does not undergo corrosion due to the formation of oxide layer?

Zinc
Aluminium
Iron
Copper

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Chemistry
The material known in commerce as Terylene is a

Synthetic fibre
Blend of cotton and silk
Natural fibre
Modified natural fibre

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