Question # 1

Which of the following analytical method is used for the separation of dissolved components from solutions.

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Chromatography

Dialysis

Solvent extraction

Distillation

The green colour of glass is due to the presence of.

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Chromium (III)

Cobalt (II)

Mn (IV)

Iron(III)

A diameter of human hair is approximately ________________ m

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75000

75

7.5 x 10^-5

7.5 x 10^-9

The unit cell having dimensions, a = b=c, alpha = beta= gama not equal 90 ^o is known.

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Cubic

Trigonal

Tetragonal

Monoclinic

Iodination of benzene takes place in the presence of iodine and

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HNO3

HIO3

HgO

All of these

Which of the following is not correct criteria for an idea solution.

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Enthalpyh of mixing = 0

Volume of mixing = 0

Free energy of mixing = 0

Obeys Reoult's law

Noble gases are sparingly soluble in water owing to.

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Dipole -dipole interactions

Dipole -induced dipole interactions

Hydrogen bonding

Induced dipole -instantaneous dipole interactions

Borax exist in the form

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Ordinary borax

Octahdral borax

Borax glass

All above

Carbides because of their hardness are

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Ionic carbides

Interstitial carbides

covalent carbides

Any of above

Pick out the incorrect statement regarding ozone.

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O3 is an unstbale dark blue diamagnetic gas

The central oxygen in O3 is sp3 hybridized

It cause the tailing of mercury

It does not react with KOH

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