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Chemistry

Chemistry
The iron ore magnetite consists of

3Fe2O3 .. 3H2O
Fe2O3
Fe3OH4
FeCO3

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Chemistry
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

p-electrons in Ne(Z = 10)
p-electrons in CI(Z = 17)
s-electrons in Mg(Z = 12)
d-electrons in Fe(Z = 26)

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Chemistry
What is the atomic number of Oxygen

5
12
8
22

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Chemistry
The maximum number of covalent formed by nitrogen is

4
1
2
3

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Chemistry
Atoms having the same number of protons but different number of neutrons are called :

Anions
Higgs-boson
Isotopes
Cations

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

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

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