Question # 1

The standard enthalpy change in the formation of 1 mole of a compound from its elements in their standard physical states is

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Enthalpy of formation

Enthalpy of atomization

Enthalpy of neutralization

Internal energy change

The degree of unsaturation in fats or oils is usually measured by numbers of grams of iodine required by 100 grmas of fat, this is called

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Oil number

Saturation number

Iodine number

Un saturation number

In the reaction K₂Cr₂O₇+ HCl + CrCl₃+ Cl₂+ H₂O the element which is reduced is

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K

Cl

Cr

H

Which has highest 1st I.E.

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Br

Cl

F

l

In which of these processes are smell organic molecules made into macromolecules?

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethane

The hydrolysis of proteins

Hydrocarbans, SO₂, CO, NH₃, nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Group VI-B of transition elements contains:

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Zn, Cd, Hg

Fe ,Ru ,Os

Cr, Mo ,W

Mn, Te, Re

The polymers which can not be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ion in filtrate?

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Ag⁺ and NO_3- only

Ag⁺ and Ba² and NO^-3

Ba² and NO^-3

Ba² and NO^-3and Cl-

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di(4-bormophenyl) method

Methanol

Propan-1-ol

Propan-2-ol

Which statement in not correct about alcohol?

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Ethyl alcohol is heavier than water

Ethyl alcohol ecaporates more quickly

Alcohol with less number of carbon atoms is more soluble in water than alcohol with more number of carbons atoms

Alcohol produces H₂by reaction with sodium metal

Interstitial compounds have

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Half formula

Fixed formula

Indefinite formula

None

Which is more active ?

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Alkanes

Alkenes

Alkynes

Benzene

Alkyl halides react with Mg in dry ether to form

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Magnesium halide

Grignard's reagent

Alkene

Alkyne

2SO₂+ O₂⇌2SO₂H= 188KJ mole^-1

Which statement about following equilibrium is correct :

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The value ofK_pfalls with arise in temperature.

The value ofK_pis equal tok_c.

The value ofK_pfalls with the increase pressure.

Adding V₂O₅catalyst increase the equilibrium yield of Sulphur trioxide.

Soil salinity can be measured by

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Calorimeter

Potometer

Porometer

Conducitvity meter

A nucleophilic reagent will readily Attack

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Ethylene

Ethanal

Ethanol

Ethylamine

Alkyl halides ae considered to be very reactive compounds towards nucleophiles because

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They have an electrophilic carbon

They have an electrophilic carbon and a good leaving group

They have an electrophilic carbon and a bad leaving group

They have a nucleophilic carbon and a good leaving group

Sodium should be stored in

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Air free from moisture

Air free form carbon dioxide

Under water

Under kerosene oil

Cracking products are :

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Only alkanes

Only alkenes

Alkanes and alkenes

Alkynes

When electrically is passed through molten Al₂O₃+ Na₃AlF₆and 13.5 gms of Al are deposited, the number of farady must be

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0.5

1.0

1.5

2.0

Metallic conduction is due to the

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Movement of electrons

Movement of ions

Both a and b

None of these

Elements combine together due to inherent tendency to stabilize themselves by:

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Losing electron.

Sharing electrons.

Gain in electrons.

All of above.

P₂O₅is heated with water to give

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Hypophosphorus acid

Phosphorus acid

Hypophosphorus acid

Orthophosphorus acid

In a heterollytic bond fission reaction

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A molecule of H₂O is formed

A molecule of H₂O is eliminated

A free radical is formed

A positive and a negative ion is formed

The number of antibonding electron pairs in O^2-molecular ion on the basis of MOT is

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4

3

2

5

Which one of the following has discontinuous solubility curve

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CaCI₂6H₂O

NaCI

KCI

NaNO₃

Half life period of N₂O₅is 24 minutes and it remains same where we increase or decrease its initial concentration, then reactions

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Zero order

First order

Second order

Third order

It rate law of an equation is written asdx/dt=K[A][B] ?

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Reaction is independent of the concentration of A and B.

Product is decreasing with passage of time.

Reactant in increasing with passage of time.

Reactant is increasing with passage of time.

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

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3

2

1

0

Oxidation of ter-alcohol gives:

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Aldehyde

Formaldehyde

Ketone

Alkens

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