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Chemistry

Chemistry
The oxidation number of nickel in K4[Ni(CN)4] is

4
8
–4
Zero

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

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

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

Isotopes
Higgs-boson
Anions
Cations

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Chemistry
The iron ore which contains 72% of iron is :

Limonite
Haematite
Magnetite
Siderite

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Chemistry
The luster of a metal is due to

its chemical inertness
presence of free electrons
its high density
its high polishing

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Chemistry
The acid which fails to liberate carbon dioxide from sodium bicarbonate is :

Carbonic acid
Sulphuric acid
Formic acid
Acetic acid

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