Question # 1

The number of unpaired electrons in ferrous ion ( Z - 26) is

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3

2

4

5

By applying Hess's law, we can calculate

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ΔH

ΔS

ΔF

K

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+712 KJ mol^-1

+492 KJ mol^-1

-932 KJ mol^-1

-960 KJ mol^-1

The credit of discovering neutron goes to

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Rutherford

Langmuir

Chadwick

Austen

In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Classical smog occurs in palces of

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Excess SO₂

Low temperature

High temperature

Excess NH₃

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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Low value

Higher value

Both values

None of these

Chromatography is derived from Greek word 'Khromatos' means:

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Type writting

Printing

Color writing

Writing

The hydroxyl derivatives of aromatic hydrocarbons which have the -OH group directly bonded to the ring C-atom are called

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Alcohols

Ketones

Esters

Phenols

Acetone reacts with HCN to form a cyanohydrin. It is an example of:

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

Formation of a cation is:

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Exothermic process

Non-endothermic process

Endothermic process

None of above

Which of the following posses linear geometry

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Alkane

Alkene

Alkyne

Benzene

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Fe is reduced

Fe is oxidized

Cl₂is oxidized

None of these

For spontaneity of a cell, which is correct?

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ΔG = 0,ΔE = 0

ΔG = -ve ,ΔE = 0

ΔG = +ve ,ΔE = 0

ΔG = -ve

For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test

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HCHO and CH₃CHO

CH₃CHO and CH₃COCH

CH₃COCH₃and C₆H₅COCH₃

CH₃COOH and CH₃COOCH₃

Value of rate constant k is specific for a reaction, and varies from reaction to reaction. The value of k of a reaction changes with

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Time

Temperature

Concentration of reactants

Order of reaction

During the formation of a chemical bond the potential energy of the system

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Decreases

Increases

Does not change

None of these

Aldehydes are oxidizes are to give:

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Primary alcohol

Sec-alcohol

Ter-alcohol

Carboxylic acid

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Plank's equations

de Broglie's equations

Heisenburg's equation

None

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

The tendency of atoms to attain a maximum of eight electrons in the valence shell is known as:

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Duplet rule.

Triad rule.

Octet rule.

Tetrade rule.

A carboxylic acid contains:

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A hydroxyl group

A carboxyl group

A hydroxyle & carboxyl group

A carboxyl &aldehyde group

Most transition elements show

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Diamagnetic behavior

Ferromagnetic behavior

Paramagnetic behavior

None of these

In the chemical combination of hydrogen and fluorine to form HF:

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Sodium atom donates major share of its electrons.

Hydrogen atom donates the major share of its electrons.

Both the atoms share the electrons equally.

None of above.

Hypo is used in photography for

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Developing picture

Picture printed

The colour of picture

The fixation of picture

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

Which of the following is used as disinfectant

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K₂Cr₂O₇

KMnO₄

K₂MnO₄

K₂CrO₄

Which of the following compound is no formed according to octet rule:

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KrF₂

XeF₂

XeO₃

SF₆

The group linkage present in fats is

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Peptide linkage

Ester linkage

Glycosidic linkage

None of these

In which of the following cases, the reaction goes farthest to completion

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K = 10³

K = 10^-2

K = 10

K = 10⁰

SN₂reaction has order of reaction :

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First

Second

Third

Zero

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