Question # 1

Replacement of hydrogen atom by - SO₃H group in benzene is called

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Nitration

Alkylation

Sulphonation

Acylation

Which of the following elements is not present abundantly in earth's crust?

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Silicon

Aluminium

Sodium

Oxygen

What is not a common use of methane

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As a fuel

For the preparation of haloaklanes

For the preparation of methyl alcohol

For the preparation of sulphuric acid

The elements of group lA are called

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Chalocogens

Halogens

Alkali metals

Alkaline earth metals

The organic compounds which are derivative of hydrocarbons of oxygen are:

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Carbohydrates

Phenols

Alcohals

All of these

B-B'-dichloroethyl sulphide is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

The chemical reactivity of glass is reduced by the use of

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Fluxes

Formers

Stabilizers

None of these

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

Corrosion of iron can be prevented by coating the surface with

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Zn

Sn

Ni

Any of the above

Protein may have

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Primary structure

Secondary structure

Tertiary structure

All of these

Dipole moment of CO molecule is:

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0.0

1.112 D

0.112 D

2.112 D

The energy required to break one mole of bonds to form neutral atoms is called

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Bond length

Bond strength

Bond energy

None of these

Alkanes containing carbon C₁₈ownwards are

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Gases

Liquids

Waxy solids

Solids

Sp³hybridization occurs when carbon is bound to

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Four other atoms

Three other atoms

Two other atoms

One other atoms

1 mole of N₂and 2 moles of H₂are allowed to react in a 1 dm³vessel. At equilibrium 0.8 mole of NH₃is formed. The concentration of H₂in the vessel is

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0.6 mole

0.8 mole

0.2 mole

0.4 mole

Heat,. work and internal energy of the system and surroundings are related into an equation which is called

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First law of thermodynamics

Hess's law

Henry's law

Born-haber cycle

Which one of the following is a buffer

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HCI + NaCI solution

CH₃COOH + CH₃COONH₄solution

H₂SO₄+ CaSO₄solution

CH₃COOH + CH₃COONa

Number of sigma bonds in P₄O₁₀is

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6

7

17

16

Complex protein molecules which catalyses the organic reactions in the living cells are called

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Living organisms

Enzymes

Viruses

Bacteria

Li has the lowest reduction potential while the element with highest reduction potential is

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H

F

O

N

The chemist who synthesized urea from ammonium cyanate was

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Berzelius

Kolbe

Wholer

Lavoisier

In a period, melting points of elements

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Increases

Decreases

Remain constant

First increases then decreases

Which one is primary alcohol?

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Buten-2-ol

Propan-2-ol

Butaon-1-ol

2,3-Dimethylhexane-4-ol

The process of electrical coating of one metal on another to protect, decorate or to have greater resistance to corrosion is called

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Electroplating

Electrolysis

Conduction

Induction

Half life period of a reaction is inversely proportion to the initial concentration of the reactant, then order of reaction is

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Third order

Second order

Fist order

Zero order

Acetylene gives

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White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2

White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12

White ppt. with both

Red ppt. with both

As a fixing agent in photography, sodium thisoulphate is used for

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Dissolving out unreacted silver bromide

Converting silver

Reducing solubility of AgBr

Preventing overdeveloping and fogging

When fused PbBr2 is electrolyzed :

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Lead appears at anode.

Lead appears at cathode.

Bromine appears at cathode.

Lead appears at both electrodes.

Which acid is used in the manufacture of synthetic fibre?

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

Carboxylic acids generally exists in cyclic

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Monomers

Dimers

Trimers

Tetrameter

BiCl₃on hydrolysis forms a white precipitate of

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Bismuthio acid

Bismuth oxychloride

Bismuth pentachloride

Bismuth hydroxide

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