Question # 1

H-Bond has more energy than the van der Waals forces i.e.

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1.0 kcal/mole

2.0 k cal/mole

10.0 kcal/mole

20. 0 kcal mole

The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of.

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4000 A^o

5000 A^o

6000 A^o

10000 A^o

Helium oxygen mixture is used by deep sea divers in preference to nitrogen oxygen mixture, because.

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Helium is much less soluble in blood than nitrogen

Nitrogen is much less soluble in blood than helium

Due to high pressure deep under the sea, nitrogen and oxygen react to give poisonous nitric oxide.

Nitrogen is highly soluble in wateer

Phosphorus has the oxidation state of +3 in

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Orthophosphoric acid

Hypophosphoric acid

Metaphosphoric acid

Orthophosphorus acid

The value of Kw increase with temperature because the ionization of water.

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Positive

Negative

Endothermic

Exothermic

The bond order for BO molecule is.

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2.5

3.0

2.0

3.5

The polarity of bonds can lead to polarity of molecules and affect

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Melting point

Boiling point

Solubility

All of above

Dibornae is used

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Fro high energy fuel

For welding torches

as reducing agent

All above

The alkali metal that react with nitrogen directly to form nitrides.

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Na

K

Rb

Li

Valence bond theory is also called as

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Electron pair theory

Band theory

Electron gas theory

Electron pool theory

Which of the following is a false statement.

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Halogens are strong oxidizing agent

Halogens show only (-I) Oxidation state

Hf molecules from intermolecular H-Bonds

Fluorine is highly reactive

The formula of Borax is.

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Na2B4O7 6H2O

Na2B4O7 8H2O

Na2B4O7 10H2O

Na2B4O7 12H2O

d2 sp3 is oriented in a manner

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Trigonal

Tetrahedral

Octahedral

Trigonal bipyramidal

Xenan hexaflouride at 47.7 ^oC is

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Colorless solid

yellow solid

Yellow liquid

Colorless liquid

Which of the following hydroxides is most stable.

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Mg (OH)2

Ca(OH)2

Sr (OH)2

Ba (OH)2

Finely divided iron combines with CO to give.

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Fe(CO)5

Fe2(CO)9

Fe(CO)12

Fe(CO)6

Which one of the following statements is not true.

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Transition metals form alloys

Transition metals form complexes

Zn, Cd and Hg are transition metals

K2[PtCl6] is a well known compound but corresponding nikel compound is not knonwn

Four elements A, B,C,D have atomic numbers Z , 1 ,Z, Z +1 and Z +2 Respectively If Z is 9, then bond between which pair of elements will be ionic.

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A and C

D and C

D and B

B and C

Which of the following pairs shows diagonal relationship

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Li and Mg

Na and K

Zn and Cd

Li and BE

Pi bond is formed

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By the overlapping of atomic orbitals on internuclear axis

By transference of electrons

By sidewise overlapping to half filled p orbitals

By overlapping of s-orbitals with p orbitals

The electrolytic method super passes all other methods due to.

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Furity

Cheapness

Easy available

All above

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