Question # 1

Which one of following statement about three about three states of matter is incorrect?

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in solids the particles vibrate about fixed positions

energy is released when a gas turns back to a liquid

particles in gases move in a random manner

the closer particles are together, smaller the force of attraction between them

Which of the following substance has maximum critical temperature

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H₂O

N₂

SO₂

Ne

When a compressed gas is allowed to expand into a region of low pressure, it produce:

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Vapours

Cooling effect

Heating effect

None of above

All of following acids have hydrogen bond in liquid state except:

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nitric acid

sulphuric acid

hydrochloric acid

hydrofluoric acid

Water is purified by:

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Filtration

aeration

coagualation

All of these

A single chlorine free radical can destory how many ozone molecules

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10

100

1000

10000

Boiling point of water remains 100°C although heat is continuous supplied. it is because

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decomposition of water takes place

hydrogen bonding is increased

external atmospheric pressure is not changing

kinetic energy of H₂O molecules is increasing

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

Which of the following has isomorphous structure

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NaF

S

Sn

N

All of the following are essential amino acids except

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Lysine

Aspartate

Tryptophan

Hisitidine

Macromolecules are classified:

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inorganic

organic

biopolymer

synthetic

From ₃₉Y to ₄₈Cd are called

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Transition elements

Outer transition elements

Inner transition elements

2nd transition series

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

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3

2

1

0

Which of the following is a characteristic of a reversible reaction?

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It never proceeds to completion

It can be influenced by a catalyst

It proceeds only in the forward direction

Number of moles of reactants and products are equal

Phenol is also known as

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Acetic acid

Carbolic acid

Tararic acid

Trichloroacetic acid

When alkyl halide is heated with aqueous solution of ammonia at 100°C the major product is

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Primary amine

Secondary amine

Tertiary amine

Mixture of amines and salt

Easter are pleasant smelling compounds. Which ester posseses odour like pineapple

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Amylacetate

Amylbutyrate

Ethylbutyrate

Benzylacetate

The film forming components of paints are

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Resins

Thinners

Pigments

Driers

The number of coulombs required for the deposition of 107.870 g of silver is

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96500

48250

193000

10000

A molecule in which sp²hybrid orbitals are used by the central atom in forming covalent bonds in

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He₂

SO₂

PCl₅

N₂

The gasoline with high octane No. has ______

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More knocking

Less knocking

No knocking

Only knocking

Sp³hybridization occurs when carbon is bound to

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Four other atoms

Three other atoms

Two other atoms

One other atoms

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