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Chemistry

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

3
1
4
2

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Chemistry
Solder metal is an alloy of

Copper and tin
Copper and zinc
Lead and antimony
Lead and tin

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Chemistry
If lime water is kept in the air, it turns milky due to presence of :

Nitrogen
Oxygen
Carbondioxide
Sulphurdioxide

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Chemistry
Helium gas is used in gas balloons instead of hydrogen gas because it is

Non-combustible
Lighter than hydrogen
More abundant than hydrogen
More stable

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Chemistry
Which is not an anasthetic agent in surgical operations?

Acetone
Nitrous oxide
Chloroform
Ether

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Chemistry
Which one of the following vegetable oils is used in the manufacture of paints?

Cottonseed oil
Sunflower oil
Palm oil
Linseed oil

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