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Chemistry

Chemistry
The hydronium ion is

H2+
H3O+
H+
HO -

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

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

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Chemistry
The coating of a thin layer of zinc on steel or iron objects is known as

Tinning
Galvanising
Hot dipping
Electroplating

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Chemistry
The antiparticle of an electron is

Beta particles
Positron
Proton
Alpha particles

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Chemistry
Quartz is a crystalline form of

Alumina
Glass
Silica
Limestone

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Chemistry
The trans-uranium elements are the chemical elements with atomic numbers greater than

89
86
96
92

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