Question # 1

Which of the following statements is not correct about noble gases.

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Their ionization energies are very high

Their electron affinities are nearly zero

They do not form any chemical compounds

They are not easily liquefied

The suffix "ate" at the end of the name of the compiled signifies that it is.

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Cation

Anion

Neutral

None of above

Which of the following is not true of ozone.

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It is a strong electilizing agent

It attacks organic compounds containing carbon carbon double bond

Its molecular is linear and has two different O-O bond lengths

It is more powerful oxidising agent at molecular oxygen

Electronegativity of Oygen is.

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2.5

3.5

2.4

2.1

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

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

In the formation of H2O molecule, the oxygen atom makes use of.

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2p orbitals

sp hybrid orbitals

Sp2 hybrid orbitals

Sp3 hybrid orbitals

Blue color of glass of due to the presence of .

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Cobalt (II)

Chromium (III)

Iron (III)

copper (II)

Which of the following is not a property of Cr.

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it is brilliant silvery metal

it is malleable

It can take very high polish

Its surface is tarnished easily

The first ionization energy of Mg is lower than

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Na

Ca

Al

Be

H-Bonding also ox in ling system like

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Protein

DNA

Botha A and B

None of above

All the halogen form oxyacide, except

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Florine

Chlorine

Bromine

Iodine

Which of the following statement is incorrect.

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An alloy is a mixture of two or more metals

An alloy is a mixture of two or more metal and non metal elements that have metallic properties

An alloy has a fixed composition

An amalgam is an alloy containing Hg

Tetra halides do not undergo hydrolysis

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C

Si

Sn

Pb

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

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Fluorine

Chlorine

Bromine

Iodine

Glass obtained by placing a layer of butyral plastic with a suitable adhesive between two layers of glass and cementing them by heat and pressure is called.

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Glass wool

Safety glass

Optical glass

Jena glass

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

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

The valence shell electronic configuration of group III A is.

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ns1 p2

ns2 p1

ns3p2

ns2p2

The secondary valency of Conc. CoCl3. 6NH3.

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2

4

6

8

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

Electron gas theory is able to explain

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Metallic lusture and optical properties

Malleability and ductility

High electrical and thermal conductivity

All of the above

Which of the following statements is incorrect.

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The elements of group 18 are known as aerogens.

Group 2 elements are all metals

Metallic character increase on going down a group

All the elements belonging to a particular period have same valence shell configuration.

In Serpekr's process the ore is treated with which of the following.

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Carbon

Nitrogen gas

Both A and B

None of these

Metal are generally elements

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Electronegative

Electropositive

Neutral

None of the above

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