Question # 1

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

When fused PbBr₂is electrolyed then

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Bromine appears at cathode

Lead deposited at the cathode

Lead appears at the anode

None of these happens

Of the following which is a step growth polymer

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Bakelite

Polyethylene

Teflon

PVC

Which one of the following mixture shows positive deviation form Rault's law and forms an azetrope with minimum boiling point

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Methanol + CCI₄

Methanol + acetone

Ether + HCI

Acetone + chloroform

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300 cm³

200 cm³

150 cm³

100 cm³

A chemical reaction is in equilibrium when

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Formation of product is minimum

Reactants are completely transformed into products

Rates of forward and backward reactions are equal

Equal amounts of reactants and products are present

Freezing point depression is measured by

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Beckmann's apparatus

Lands Berger's method

Antifreeze apparatus

All of the above

The self linking property of carbon is called as

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Linking polymerization

Addition

Catenation

Elimination

Which has highest 1st I.E.

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Br

Cl

F

l

Which of the following half molar solutions will have lowest freezing point

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Solution of non-volatile, none electrolyte

Solution of non volatile, weak electrolyte

Solution of non volatile strong electrolyte

Solution of volatile, non electrolyte

Closed chain compound can be classified into

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Homocyclic

Hetrocyclic

Aliphatic

Both a and b

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

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Hund's rule

Heisenberg's principle

Paulit exclusion principle

Auf bau principle

The geometrical shape of a transition complexion is related to the state of hybridizing of the central atom. What is trigonal bipyramidal

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sp³

dsp²

dsp³

d²sp³

A zero order reaction is one in which :

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Rate is not affected by changing concentration of reactants.

concentration of reactants do not change with the passage of time.

Reactants do not react.

One reactants in large excess.

E.D.T.A is

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Mono-dentate

Bi-dentate

Polydentate

Having three lone pairs of electrons

If two lone pairs are present then bond angle of tetrahedral compound reduces to ______ degrees

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109.5°

107.5°

104.5°

None

Which of the following statement about electron affinity of two elements is correct

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Carbon has greater than oxygen

Sulphur has less than oxygen

Iodine has greater than bromine

Bromine has less than chlorine

The alkyl halide is converted into an alcohol by

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Addition

Substitution

Dehydrohalogenation

Elimination

[Ti(H₂O)₆]⁺³ion absorbs colour:

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Blue

Yellow

Green

Red

Kolb's method is not useful for the production of

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Methane

Ethane

Propane

Butane

Which is not an enzyme

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Transverses

Lipase

Lyase

None of these

Molecular orbitals are filled with the available electrons according to:

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Hund's of rule.

Pauli's exclusion principle.

Aufbau principle.

All of above.

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

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Greater.

same.

Smaller.

Not fixed.

Number of elements in the first period of the periodic table are

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Two

Four

One

Eight

Which of the following is a method of converting a unsaturated ketone into unsaturated hydrocarbon?

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Aldol condensation

Reimer Tiemann reaction

Cannizaaor's reaction

Wolf-kishner reduction

The best electrode used in salt bridge is KCl. Which other electrolyte an also be used for the purpose :

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NaCl

NH₄NO₃

KNO₃

NaNO₃

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Introduction of an inert gas at constant volume

Introduction of PCl₃(g) at constant

Introduction of PCl₅(g) at constant volume

Introduction of Cl₂at constant volume

In the particular reaction for the valueK_{c 1 x}10^-25which statement is correct :

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Almost forward reaction is completed.

Amount of reactant is negligible as compared to product.

Amount of product is negligible as compared to reactant.

Amount of product is equal to amount of reactant.

Charge to mass ratio (e/m) of the electron is determined by

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R. A. Millikan

J. J. Thompson

G. J, Stoney

None of these

Which statement is not true. A solution is a homogeneous mixture of

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Two ionic substance like NaCl and HCl

Two molecular substances sugar and water

A solute and a solvent 1% NaHCO₃in water

NaCl and sand

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