Question # 1

Xenon reacts best with

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The most electropositive elements

The most electronegative elements

The hydrogen halides

Non metals

In C4-axis of rotation, an object in rotated through an angle of.

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120^o

180^o

100 ^o

90^o

Which of the following alkyl halide undergoes nucleophilic substitution reaction via the formation of a carboncation.

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1-chloro -2 methyl propane

2- chlro-2-methyl propane

2- chloro butane

1-Chloro, 3,3- dimethyl pentane

When of the following steps is involved in structure determination of an organic compound.

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Purification of compund.

Qualitative and quantitative analysis of elements present

Determination of molar mass

All above steps

Which of the following statements is not correct with the concept of Bronsted concept of acids and bases.

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An acid can donate a proton

A base can accept a proton

This concept has many bases that have OH- ions

This concept is more general

Fertilizers are classified into

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Two major categories

Three major categories

Four major categories

None of above

H2SO4 is used

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In the preparation of aqua regia

In the purification of gold and silver

In the dental filling

None of above

The experimental relationship between rate of the reaction and concentration of the reactants is called.

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Rate law

Law of mass action

Le-Chatelier's principle

Rate constant

The mole of photon is known as

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Quantum

Eienstein

Energy Packet

None of the above

Oxidation state of the chromium [Cr(NH3)6]3+ complex ion is

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+2

+3

+4

+5

Maximum desirable concentration of fluorides according to international standard is.

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10-100 ppm

1 ppm

100-200 ppm

10-20 ppm

Air pollution is not caused by

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Pollen grains

Hydroelectric power

Industries

automobiles

Which of the following statement is related with CO.

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It is a colorless and tasteless gas

It has less affinity to words hemoglobin

It has a boiling point of -192 ^oC

It is a dangerous asphyxiant

Cobalt salt imparts which colour to the borax bead

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Blue

Green

Red

Yellow

Which of the following statement is not related with the advantages of TLC.

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A variety of adsorbents can be used

The thickness of adsorbent can be varied

Fluorescence can be introduced

Different detectors can be used

Drained sewage has B.O.D.

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More than that of water

Less than that of water

Equal to that of water

None of the above

Which of the following has maximum number of unpaired electrons.

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Fe3+

Fe2+

Co2+

CO3+

_________ is preferred for horticultural crops and for tobacco and potatoes.

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Potassium Chloride

Potassium Sulphate

Potassium NItrate

None of these

In urea the amount of nitrogen is

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82.0%

46.0%

33.0%

21.0%

Potassium sulphate with 48% to 52% potash, is made from.

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Potassium phosphate

Potassium Chloride

Potassium Nitrate

None of these

An equilibrium the free energy change delta F for a reaction is.

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Maximum

Minimum

Zero

Negative

Which ionization Potential in the following equations involves the greatest amount of energy.

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Na = Na+ + e

K = K+ +e

C2+ = C3+ +e

Ca+ = Ca2+ + e

The correct order of ionization energies of alkali metals is.

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Li > Na > K > Rb

Na > K > Rb > Li

Rb > K > Na > Li

Rb > K > Li > Na

Which of the following element has six electrons in the valence shell but cannot exhibit a maximum co valency of six.

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Sulphur

Oxygen

Selenium

Both A and B

The freezing point of a solvent

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Will increase on adding a solute

Will decrease on adding a solute

Will note change on adding solute

None of the above

The smog is essentially caused by the presence of.

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O3 and N2

O2 and N2

Oxides of sulphur and nitrogen

O2 and O3

Essential oils are purified by which of the following methods.

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Steam distillation

Sublimation

Crystallization

Fractional crystallization

Alkyl cyanide and alkyl isocyanides are

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Tautomers

Metamers

Functional isomers

None of the above

On hybridization of one s and one p orbitals we get.

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Two mutualy perpendicular orbitals

Two orbitals at 180^o

Four orbitals directed tetrahedrally

Three orbitals in a plane

Select a basic amino acid.

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Glycine

Cystine

Alanine

Lysine

Enantiomers have which of the following characteristics.

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Rotate ordinary light

Have the same melting point

Are superimposable mirror images

React with optically active molecule at the same rate

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