Question # 1

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

CCl4 has zero dipole moment because of.

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Planar structure

Tetrahedral structure

Similar size of C and Cl atoms

Similar electrons affinity of C and Cl

The ions Sc3+ , Ca2+ and K+ have same electronic configuration as that of.

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Neon

Argon

Krypton

Xenon

The concept is also known as electron pair donor acceptor system.

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Bronsted Lowery

Lewis

Lux -Flood

Usanovich

Which one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

iodine is used as

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Tincture of iodine

Iodex and antiseptic

Treatment of goiter

All above

Which of the following configuration is associated with biggest jump between second and third IE.

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1s2, 2s2, 2p2

1s2, 2s2, 2p6, 3s1

1s2,2s2,2p6, 3s2

1s2, 2s2,2p6

Acid rain effects

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Human being

Crops

Aquatic life

All above

According to systematic nomenclature which hydrogen compound is sulphane.

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HF

Si H4

SF4

H2S

Which of the following steps in involved in the metallurgy of aluminium.

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Purification of bauxite

Electrolytic reduction of alumina

Refining of aluminum

All above

The oxidation state of HCiO4

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+ 7

+ 3

+ 5

+ 1

The increase in boiling points of noble gases from He to Xe is due to the

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Decreases in ionization energy

Increases in polarizability

Increase in electron affinity

Increase in atomic volume

Among group IA elements, melting point

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Increases down the group

Decreases down the group

Do not show any regular trend

Remains constant

Which one of the following ions is colourless.

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Cu+

Co2+

Ni2+

Fe3+

The pH of the tears is

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7.0

7.4

7.8

8.2

Oxygen and sulphur exist in state

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Free

Combined

_{Both free & combined}

None of above

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.

Which number of halogen family does not show positive oxidation state.

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Fluorine

Chlorine

Bromine

Iodine

The first ionization energy in electron volts of nitrogen and oxygen atoms are respectively given by.

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14.6, 13.6

13.6, 14.6

13.6, 13.6

14.6, 14.6

Pick out incorrect statemtn about K2r2O7

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It oxidizes acidified solution of H2S to S

It oxidizes Ki TO i2

It oxidizes HCl to Cl2

It gives oxygen, when treated with cold conc. H2SO4

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