Question # 1

The synthesis of ethene from ethyl alcohol is a reaction

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Dehydration

Polymerization

Addition

Substitution

Which of these polymers is a synthetic polymer?

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starch

animal fat

polyester in an addition polymer

cellulose

Glucose and fructose are isomers

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Chain isomers

Position isomers

Functional group isomers

Metamers

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

Macromolecules or polymers are large molecules built up from small molecules called monomers. This hypothesis put forward by

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schrodixger

standinger

Lewsi

newton

Polymerisation of vinyl acetate is a type of:

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homopolymer

copolymer

ter polymer

All of these

Ozone acts as:

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Pollutant

saver

oxidatant

All of these

What is effect of polluted air on enviroment:

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Ozone

Global warming

Acid rain

Smog

When two ice cubes are pressed together they unite to form one cube. Which of the following forces is responsibles for holding them together

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Van der Waal's

covalent bonding

hydrogen bonding

dipole-dipole interaction

An amion acid exists in the form of Zwitter-ioin which has:

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one + ve charge

one - ve charge

one +ve and -ve charge

two +ve charge

Stronger is the oxidizing agent, stronger is the

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emf of cell

Oxidation potential

Reduction potential

Third structure of protein structure refers to

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Number and sequence of amino acids

Three dimensional structure of protein

Proteins formed of more than one monomer

Bending of protein molecule

Diamond is a bad conductor because

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it has light structure

it has a high density

there are no free electron present in the crystal of diamond to conduct electricity

it transparent to light

Etherification is catalyzed by

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Acids

Gases

Salts

None of the these

Ozone hole refers to

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Hole in ozone layers

Reduction in thickness of ozone layer in stratosphere

Reduction of thickness of ozone in troposphere

Increase concentration of ozone

Reaction of Grignard's reagent eith aldehyds other formaldehyde gives: Reaction of Grignard's reagent with formaldehyde gives:

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Pri-alcohol

Sec-alcohol

Ter-alcohol

Carboxylic

According to Lewis concept ethers behave as:

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Acid

Base

Acid as well as a base

None of them

SN2 reaction can be best carried out with

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Primary alkyl halides

Secondary alkyl halides

Tertiary alkyl halides

All the three

The most acidic of the following compounds is

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P₂O₃

Sb₂O₃

B₂O₃

As₂O₃

A compound contains 75% carbon and 25% hydrogen, by mass. What is the molecular formula of the compound/

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C₃H₈

CH₄

C₂H₄

C₂H₆

Phenol is a weak acid. The correct order of acid strength of carboxylic acid, phenol and alcohol is

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Carboxylic acid > phenol > alcohol

Carboxylic acid > alcohol > phenol

Phenol > carboxylic acid > alcohol

Alcohol > phenol > carboxylic acid

Energy can neither be created nor destroyed, although it can be transformed from one form to another. This is a statement of

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Law of conservation of matter

Law of definite proportions

Law of conservation of energy

None of these

The conversion of chemical energy into electrical energy requires :

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Electrolytic cell

Galvanic cell

Voltaic cell

Both (b) and (c)

If Grignard reagent is allowed to react with another alkyl halide the main product is

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An alkane

Cyclo alkane

Alkyne

An alkene

The total number of transition elements is

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10

14

40

50

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

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CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

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

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K

Cl

Cr

H

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