Choose the incorrect statement...

Choose the incorrect statement

The chemical symbol of nickel is Ni.

An element is a material made of different kind of atoms.

The physical state of bromine is liquid.

The physical and chemical properties of the elements are periodic functions of their atomic numbers

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PERIODIC CLASSIFICATION OF ELEMENTS
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Choose the incorrect pair

Benzene and nitro benzene : Distillation

Coal tar and crude oil : Fractional distillation

Aniline and turpentine : Steam distillation

Naphthalene and benzoic acid : Crystallization

`BaSO_(4)` : White colour precipitate

`Ag_(2)S` : Black colour precipitate

`Fe(CNS)_(3)` : Prussian blue colour

PbS : Black colour precipitate

propanal and propropane : Functional isomerism

Nitrite form and nitro form : Tautomerism

Pent-1-ene and pent-2-ene : Chain isomerism

Propanoic acid and methyl acetate : Functional isomerism