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Chemistry

Chemistry
________ is a by product of sewage treatment and can be decomposed to produce biogas

Sewage
Sludge
Scum
Sewer

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

N3- > Na+ > O2- > F-
N3- > O2- > F- > Na+
Na+ > O2- > N3- > F-
O2- > F- > Na+ > N3-

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

2
3
1
4

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Chemistry
Which of the following is not a donor atom?

Aluminium
Antimony
Arsenic
Phosphorus

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Chemistry
DDT and BHC may act as

Carcinogens
Asthematic agents
None of these
Allergens

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Chemistry
Rutherford’s scattering experiment proved the presence of

Atoms in all matter
Nucleus in atoms
Neutrons in atoms
Electrons in atoms

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