Question # 1

Which of the following does not apply to metallic bond.

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Overlapping valence orbitals

Mobile valency electron

Delocalized electrons

Highly directed bonds

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 element amongst the following has the highest boiling point.

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Na

Mg

Ca

K

The concept of telluric helisx was developed by

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Lother meyer

A.E. de Chancourtois

New lands

Doberieiner

The noble gas used or treatment of cancer is

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Helium

Argon

Radon

Krypton

An sp3 hybrid orbital contains

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1/4 a character

1/2 a character

2/3 a character

3/4 a character

Which of the following will exhibit variable electro Valency due to intert pair effect.

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Fe

Sn

K

Both Fe and Sn

In German Silver copper is alloyed with which metal.

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Zn

Ni

Ai

Zn and Ni

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

Which of the following does not form stable diatomic molecule.

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Nitrogen

Phosphorus

Hydrogen

Oxygen

AI Cl3 acts as a strong Lewis acid, because it is.

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A covalent compound

Readily hydrolyzed

Electron deficient

An ionic compound

In which of the following species the bonds are non directional.

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NCl3

RbCl

BeCl2

BCl3

Which of the following carbides reacts with H2O to form propane.

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Al4C3

CaC2

SiC2

Sic

Which of the following exists as polymeric chains in solid state.

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Sr Cl2

Ba Cl2

MgCl2

BeCl2

Which of the following is not an ore of nickel.

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Pentalandite

Siderite

Garnierite

Nicollite

Ferrochrum contains Cr up to

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60-70%

70-80%

80-90%

40-50%

Which is the purest form of iron.

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Pig iron

Cast iron

Wrought iron

Steel

In the Lewis structure of H2SO4 molecule the total number of unshared electrons in valence shell of various atoms is.

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8

16

12

20

Which of the following statements false about transition metals.

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They form complexes

They show variable valency

All transiting metal compounds are paramagnetic

They form coloured ions

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

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

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