Question # 1

Green houses are responsible for keeping our plant warm and sustaining life on the earth.

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CO2 & water vapours

CO2 & CFC

CO2 & H2O

CO2 & CH4

Valences bond theory was put forward by

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Pauling and Slatter

Heitler and London

Lewis

Pauli

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

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Sr Cl2

Ba Cl2

MgCl2

BeCl2

Group III A of the periodic table consist of elemetns.

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3

4

5

6

The pH of the tears is

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7.0

7.4

7.8

8.2

Berllium has diagonal relationship with

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Li

Al

B

Na

Which of the following elements has the highest value of IE.

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Na

K

Mg

Ca

Which of the following is a pseudohalide.

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I3-

IF7

CN-

ICI

If steel is heated to a temperature well below red heated and is then cooled slowly the process is called.

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Annealing

Quenching

Tempering

Nitriding

Which of the following gas is lightest.

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Dihydrogen

Helium

Dinitrogen

Dioxygen

Sulphate ores of aluminium

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Alumite

Cryolite

Fekdsper

Kaolin

In whihc period, the element with least ionization enthalpy belong to

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Group I

Group 2

Group 17

Group 18

Acid rain effects

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Human being

Crops

Aquatic life

All above

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

Aluminium halides is.

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White crystalline solid

Hygroscopic

Sublimes at 180^oC

All above

Xenon reacts best with

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The most electropositive elements

The most electronegative elements

The hydrogen halides

Non metals

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 type of bonding in HCl is

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Pure covalent

Polar covalent

Highly polar

Hydrogen bonding

Which one of the following elements shows the most stable oxidation state of +1

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AI

Ga

In

TI

Which one of the following has the highest boiling point.

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H2O

H2S

H2Se

H2Te

Which can be purified by sublimation

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F2

Cl2

Be2

I2

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