Question # 1

Oxygen and sulphur exist in state

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Free

Combined

_{Both free & combined}

None of above

The most stable oxidation state shown by lead is.

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+2 , +4

+2 only

+3 , +4

+4 only

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

When two atoms of hydrogen combine to form a molecule of hydrogen gas the energy of the molecule.

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higher than that of the separate atoms

Equal to that of the separate atoms

Lower than that of the separate atoms

Sometimes lower and sometime higher.

Pick out incorrect statement.

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NF3 molecule has trigonal pyramidal structure.

It is practically incoluble in water and is only hydrolyzed, an electric spark is passed through a mixture with water vapour.

Dipole moment of NF3 is more than that of NH3

Nitrogn (III) oxide (N2O3) is an acidic oxide.

A trend which is common to elements of both the group IA and group VII A ongoing from top to bottom.

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Boiling point increases

Electron affinity increases

Oxidizing power increases

Ionization energy decrease

Of the molecules, SF4, XeF4, and CF which has square planar geometry.

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SF4, XeF4 and CF4

Sf4 only

CF4 only

XeF4

B.P of heavy water is

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equal to that of ordinary water

greater than that of ordinary water

Less than that of ordinary water

equal to that of distilled water

The concept of telluric helisx was developed by

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Lother meyer

A.E. de Chancourtois

New lands

Doberieiner

Helium is used in weather balloons and airships instead of H2 becuse it is.

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Lighter than hydrogen

Incombustible

More abundant than hydrogen

Radiactive

A mixture of weak acid and its salt is.

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Alkaline buffer

Acidic buffer

Neutral buffer

All of above

The noble gas which was discovered first in the sun and then on the earth is.

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Helium

Neon

Argon

Xenon

Which one of the following noble gas is obtained by radioactive disintegrastion

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Kr

Br

Rn

Xe

Principal constituents of noble gases is

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Argon

Neon

Xenon

Helium

Phosphorus has the oxidation state of +3 in

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Orthophosphoric acid

Hypophosphoric acid

Metaphosphoric acid

Orthophosphorus acid

Black and white photographic film contain small grains of.

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Silver bromide

Silver cholride

Silver iodide

Any of above

VBT is unable to explain the nature of some of the complexes of.

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Cobalt

Copper

Nickle

Manganese

In urea the amount of nitrogen is

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82.0%

46.0%

33.0%

21.0%

Which of the following statements is wrong.

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Covenant compounds are generally soluble is polar solvents.

Covalent compounds have low melting and boiling points

Lower than that of separate H atoms

Sometimes lower and sometimes higher than that of separate H

Which of the following orbitals has maximum penetration effect.

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s

p

d

f

Chromium is found in nature in the the form of.

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Oxides

Silicates

Borates

Sulphides

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