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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
The compound that has the least value for octane number is :

2,2-dimethyl hexane
N-heptane
2-methyl heptane
Iso-octane

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Chemistry
Oxide of sulphur present in the atmosphere are washed down by rains to cause :

Eutrophication in lakes
Lowering of pH of soil
Industrial smog formation
Depletion of fossil fuel reserves

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Chemistry
The name of plastic polymer from which combs, toys, bowls etc., can be made, is

Polystyrene
Metallic polysulphides
Teflon
Polyurethane

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Chemistry
Silica gel is a

Moisturizer
Delicious food
Drying agent
Flavouring agent

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Chemistry
Dry ice is the solid form of :

Nitrogen
Carbon di–oxide
Air
Water

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MORE MCQ ON Chemistry

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