Question # 1

The element having highest ionization energy and least electron affinity belong to

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Period 1 , group 18

Period 2, group 17

Period 2, group 1

Period 2, group 2

The pH of the 0.0032 M H2SO4 is.

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3.2

4.0

2.198

1.0

A mixture containing S2- and SO4 ions on trating with dil HCl will produce

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H2S gas

SO2 gas

H2S and SO2 gas

CO

Which of the following substance is most abundant of all components of atmospheric air.

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O2

N2

CO2

A2

Pick out the incorrect statement for SO2

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It turns filter paper moistened with acidified K2Cr2O7

It turns starch iodate paper blue

It does not react with chlorine in presence of charcoal

It decolourises acidified KMnO4 solution.

In DTA , theriac effect may be exothermic of endothermic These are cause by

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Fusion

Crystal structure inversion

Destruction of crystal lattice

All of above

Transition elements, in general, exhibit the following properties, except one, Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

Among the unit cells given below, which has the highest symmetry

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Monoclinic

Cubic

Hexagonal

Orthorhombic

Reaction in which molecules absorbing light do not themselves react but induce other moleculaes to react are called.

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Chain reactions

Photosenaitized reactions

Reversible reactions

Free radical reactions

Pauling has suggested that the calculate of energy can be improved by considering.

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Screening effect

Polarization effect

Both A and B

None of abvoe

Which of the following is not a characteristic of covalent compound.

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They have low melting and boiling points.

They ionize on dissolution in polar solvents

Their molecules have definite geometry

They are generally insoluble in water

The correct increasing order of bond dissociation energy for N2, O2, F2 and Cl2 is

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N2 < O2 < F2 < Cl2

F2 < Cl2 < O2 < N2

F2 < Cl2 < N2 < O2

N2 < Cl2 < F2 < O2

The value of an Einstein

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Is independent of wavelength

Decrease with increase in wavelength

Increase with increase in wavelength

Depends on the temperature of the absorbing system

When a strong beam of light is passed through a colloidal solution, the light will

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Be reflected

Be scattered

Pass unchanged

Be dispersed

Which of the following compounds has highest dipole moment.

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Dichloromethane

Chloroform

Chloromathane

All above

When orthoboric acid is heated strongly it gives.

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B2O3

H2B3O7

HBO2

B

What refers to the application of any process whereby the surface of steel is altered so that it will become hard.

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Caburizing

Case harden zing

Ammealing

Surface hardening

Which of the following solution has pH= 11?

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1 X 10^-11 m NaOH

1 x 10^-11 m HCl

1 x 10^-3 M NaOH

1 X 10 ³ M NaOH

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

Air pollution is not caused by

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Pollen grains

Hydroelectric power

Industries

automobiles

Which of the following statements is not a part of Bohr's theory of the hydrogen atom.

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An electron in an atom revolves aroung the nucleus only in circular paths.

An electron does not absorb energy in the stationary orbit

An electron does not emit energy in the stationary orbit

Energy is emitted or absorbed in a discrete amount from the stationary orbit

Which of the following is not biological characteristics of water.

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COD

Animals

Plants

Viruses

Which of the following does not represent Lewis acid.

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ZnCl2

FeCl2

BF3

Bul4

Which librates H2 with NaOH

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B

AI

Zn

All

1 nanometre =___________ cm

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10^-9

10^-8

10^-7

10^-6

Which of the following element is usually determined by flame photometry.

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Li

Na

K

All above elements

In which of the following compounds does hydrogen bonding occur.

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CCl4

NaH

HI

NH3

The geometry of Xe F2 is

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Triangular planar

Square planar

Linear

Trigonal bipyramidal

Metal are

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Hard

Ductile

Malleable

All

What refer by the ability of steel to be hardened through to its centre in large section?

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Malleability

Hardenability

Ductility

Rigidity

The most electronegative and the most electromotive elements of the first period is

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H and He

Na and Cl

Li and F

H and He

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