Question # 1

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

The pH range of the acid rain is:

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6.5 __ 6

Less than 5

8 __ 7.5

7 __ 6.5

Which of the following is not an electrophilic substitutional reaction of benzene?

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Free radical chlorination of benzene

Friedel Craft alkylation

Sulphonation

Nitration

Anline is a derivative of:

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alkane

alkene

aromatic hydrocarbon

alicyclic

Nylon 6,6 is a condensation polymer of:

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Phthalic acid and hexa ethylene diamine

adipic acid and hexaethylene diamine

phthalic acid and glycerol

The concentration of product is increasing from 30 mole/dm3 to 40mol/dm3 in 0.5 sec then rate of reaction will be------moledm-3sec-1

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0

20

15

25

NH₃shows a maximum boiling point among the hydrides of Vth group elements due to

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very small size of nitrogen

hydrogen bonding between its molecules

enhanced electronegative character of nitrogen

pyramidal structure of NH₃

Oxygen molecule is 16 times heavier than:

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Helium

Hydrogen

Neon

Aluminium

Which ion is most polarising?

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AI³⁺

Ba²⁺

Mg²⁺

Na⁺

Which of the following successive ionization energies belong to a Group ll element?

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320,600,1110,1700,5650,

577,1820,2740,1160,14800,

428,3070,4600,5860,7990

736,1451,7740,10500,13600

The mono atomic gases are

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Halogens

Noble gases

6h group elements

Nitrogen and oxygen

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

Gooch crucible is made of:

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Brass

Porcelain

Bronze

.Gold

Charge to mass ratio (e/m) of the electron is determined by

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R. A. Millikan

J. J. Thompson

G. J, Stoney

None of these

The M.P. of carboxylic acids containing even number of carbon atoms is ______ than the next

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Higher

Low

Equal

None

Nitroalkane are used in

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Fuel

Solvents

Organic synthesis

All of them

The solution of which acid is use for seasoning of food?

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Formic acid

Acetic acid

Benzoin acid

Butanoic acid

Which of the following statement about electron affinity of two elements is correct

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Carbon has greater than oxygen

Sulphur has less than oxygen

Iodine has greater than bromine

Bromine has less than chlorine

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Increase in concentration of 1

Decrease in concentration of I₂

Increase in temperature

Increase in total pressure

Pure water does not conduct electricity because it

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Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

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 maximum number of electrons in the outermost shall of s-black elements is

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One

Two

Three

Four

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