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Chemistry

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

4
1
3
2

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Chemistry
Which of the following laser types is used in a laser printer?

Dye laser
Semiconductor laser
Excimer laser
Gas laser

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Chemistry
Which one of the following metals is used to galvanise iron ?

Lead
Zinc
Copper
Mercury

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Chemistry
An inert gas mixed with oxygen given to patients suffering from restricted breathing is

Radon
Argon
Helium
Krypton

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Chemistry
Aquaregia is a mixture of the following in the ratio 1 : 3 by volume

Dil. HCl and dil. HNO3
Conc. HCl and conc. HNO3
Conc. HNO3 and conc. HCl
Conc. HNO3 and conc. H2SO4

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Chemistry
Which of the following has least negative electron gain enthalpy

F
P
S
Cl

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