Question # 1

In which of the following molecules, strongest H-bond is shown?

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hydrogen fluoride

water

hydrogen sulphide

ammonia

Air contains 78% N₂, 21% O₂ and 1% other gases at sea level the partial pressure of O₂ is

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760 torr

159 torr

592 torr

7.6 torr

In which molecule. all atoms are coplanar?

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CH4

BF3

NH3

PH3

In Case of elements the polymorphism is called

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Isotopic form

Allotropy

Isomorphism

Crystalline forms

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

In big/metropolitan cities, atmosphere is mostly polluted due to

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

Diamond and silicon carbide are insoluble in all solvents because

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they have high melting and boiling points

absence of three electrons

they are huge giant three dimensional molecules (macromolecules)

their unit cells have tetrahedral geometry

Liquefaction of gas can only be carried out if the:

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without caring for the value critical volume at critical stage

the temperature is more than critical and pressure is 1000 atm

the temperature is below the critical and pressure is very high

temperature is above the critical temperature and pressure can have any value

If a salt bridge is removed from two half cells the emf is

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Increased

Decreased

Dropped to zero

Electrodes will be reversed

Types of bonds between C terminal and N terminal is

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Covalent

Disulphide bond

Peptide

Ionic

During the nitration of benzene the nitrating agent is

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NO3

NO2+

NO2-

HNO3

Which of the following ion has the highest value of ionic radius?

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Li⁺

F^-

O^2-

B³⁺

C- X bond is strong in

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CH₃Cl

CH₃Br

CH₃F

CH₃I

pH and pKa of the buffer are related by Henderson equation which is

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Which responds to +ve iodoform test?

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Butanol-1

Butan-1-al

Butanol-2

2-pentanone

Which one gives acidic reactions?

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CH₃----C≡C-------CH₃

CH₃-----CH₂-----HC=CH----CH₂

CH₃----CH=CH₂

CH₃-----C≡CH

Which property is not present in lipids?

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Liquid

Solid or semi solid

Soluble in water

Form emultion

Hydrolytic coversion of sucrose into glucose and fructose is known as

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Induction

Inversion

Insertion

Inhibition

The spectrum of He is expected to be similar to that of

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H

Na

He⁺

Li⁺

Paraffins are also called

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Alkanes

Alkynes

Alkenes

None of these

As compared to molar solution, in the molal solution the quantity of solvent is :

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Comparatively lesser

More or less equal

Comparatively greater

Very large

Aldehydes are produce in atmosphere by

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Oxidation of secondary alcohols

Reduction of alkenes

Reaction of oxygen atoms with hydrocarbons

Reaction of oxygen atoms with ozone

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