Question # 1

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

Which of the following does not form stable diatomic molecule.

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Nitrogen

Phosphorus

Hydrogen

Oxygen

Which of the following have +3 oxidation states.

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B & AI

In & TI

B & In

AI & TI

Most electronegative element is.

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C

Si

Pb

Sn

NH3 has a not dipole moment while BF3 has zero dipole moment Thsi is because.

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NH3 is not a planar molecule while BF3 is a planar molecule.

NH3 is a planar molecule, while BF3 is a planner molecule.

Fluorine is more electronetative than nitrogen

Born is more electronegative than nitrogen

Which of the following reactions is employed to produce ozone in the laboratory.

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Exposure of air to UV light

Reaction of F2 with H2O at low temperature

Reaction SO2 with H2O2

Passage of silent electric discharge through oxygen

Which of the following elements forms maximum number of compounds.

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Carbon

Silicon

Hydrogen

Fluorine

Stainless steel contains

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Fe+Cr+Ni

Fe+Ni+Cu

Fe + Cr+ Cu

Cu + C + Ni

Setting of plaster of Paris volves.

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Oxidation with atmospheric oxygen

Combination with atmosphere CO2

Dehydration

Hydration to yield another hydrate

Which of the following statement is not true for carbon.

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Its forms compounds with multiple bonds

Its ionization energy is very high

It undergoes catanation

It shows inert pair effect

In German Silver copper is alloyed with which metal.

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Zn

Ni

Ai

Zn and Ni

The boiling point of water is unexpectedly high because.

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H2O molecule in linear

Sp3 hydrogen bonding is involved in the formation of water

There is hydrogen bonding and consequent association of H2O molecules.

Oxygen is the first member of the VI group

The fluoride tooth paste contains

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SnF2 and Sn2P2O7

NaF

CaF2

None of these

Dry ice is

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Solid CO

Solid CO2

Solid NH3

Solid SO2

The correct order of reactivity among I , Ii, and III IS.

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i > ii >iii

i > iii > ii

II > III > I

III > II > I

The H2SO4 obtained by the contact process having purity

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70%

74%

78%

82%

The movement of an electric charge produce a magnetic field is known from the

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Elementary Physics

Elementary Chemistry

Both A and B

None of above

Keeping in view the periodic law and periodic table, suggest which of the following elements should have maximum electronegative character.

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Oxygen

Nitrogen

Fluorine

Astatine

Flourine differs from the other members of its own group due to.

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Its small size and low bond energy

Its higher electornegativity

None-availability of d-orbitals in its valence shell

All the above

SO3 exists in form

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a -so3

b-SO3

gama SO3

All above

The dipole moments of the given species are such that.

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BF3 > NF3 > NH3

NF3 > BF3 > NH3

NHE > NF3 >BF3

NH3 > BF3 > NF3

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