Question # 1

By convention, the standard heat of formation of all elements is assumed to be

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Zero

positive

Negative

Infinity

Which of these polymers is a synthetic polymer?

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Animal fat

Starch

Cellulose

Polyester

Which of the following compound shows the geometrical isomerism

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2-butene

2-butyne

2-butanol

Butanol

The enzyme which is found in saliva, accelerates the conversion of starch into sugar is

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Pepsin

Thrombin

Ptyalin

Fumarase

Which of the following is NOT thermoplastic

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PVC pipes

Plastic toys

Varnish

Both A and B

The normal amount of overhead ozone is about in DU:

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150

250

350

450

Which is not a calcareous material?

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line

clay

marble

marine shell

The protein which only yield amino acids and their derivatives

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Simple proteins

Complex proteins

Derived protein

All of these

The boiling point of higher alkanes are greater than those of lower alkanes due to reason that

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higher alkanes have greater number of atoms

the polarizabilities of higher alkanes are greater

higher alkanes have greater hydrogen bonding

higher alkanes have zig-zag structures

Choose the correct statements

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SO₂affects the nucleus

SO₂affects plasmodesmata

SO₂affects cell wall

SO₂affects all membrane systems

The structure of a polymer depends upon how the monomer-repeating unit joins to makes a polymer, What is not the type of structure of a polymer?

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synthetic polymer

linear polymer

branched

cross linked or inter connected polymer

What will react differently with the two isomeric pentols, (CH₃)₃CCH₂OH and (CH₃)₂CH CH₂CH₂OH

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Acidified (aq) KMnO₄

Concentrated H₂SO₄

PCl

Sodium

Which is not a calcarious material?

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Lime

Clay

Marble

Marine shell

Which one of the following solution will have higher vapour pressure than that of water

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Aqueous solution of methanol

Aqueous solution of HCI

Aqueous solution of glucose

Aqueous solution of urea

The total number of orbitals possible for the quantum number n is

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n

n²

2n

2n²

How many moles of hydrogen atoms does 3.2 g of methane, CH₄, contain?

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0.02

0.2

0.4

0.8

Ethanol can be converted into ethanoic acid by

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Hydrogenation

Hydration

Oxidation

Fermentation

How many structural acid cis-trans isomers are there for dichloroprepe, C₃H₄Cl₂

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3

5

6

7

Diethyl ether is obtained by Williamsons synthesis using

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Ethanol + Na + C₂H₅Br

Ethanol + Mg + C₂H₅Br

Methanol + Na + CH₃Br

Methanol + Mg + CH₃Br

Organic compounds are soluble in all except

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Benzene

Petroleum

Ether

Water

In which of the following theories the hybridizationis considered

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Vsepr

Lewis

Molecule orbital

Valence bond

Which of the following is fully fluorinated polymer?

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Neoprene

Teflon

Thiokol

PVC

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