Question # 1

Ionic solids are characterized by

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low melting points

good conductivity in solid state

high vapour pressure

solubility in polar solvents

Which one of the following groups is indicated when HCI is formed by reaction of ethanol with phosphorous pentachloride?

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Amino group

Halide group

Hydroxyl group

Hydride group

In a cubic lattice a unit cell is shard equally by how many unit cells?

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4

2

6

8

When enzyme fumarase is exposed to UV light, then

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Its activity is enhanced

It converts into Glucokinase

It is inactivated

None

The formation of PVC from vinyl chloride is an example of

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subtsitution reaction

addition polymerization

condensation polymerization

condensation reaction

In a crystal the atoms are locate at the position of:

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infinite potential energy

minimum potential energy

Zero potential energy

maximum potential

Temperature at which molecular motion ceases is called

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Absolute zero

Absolute temperature

Critical temperature

Difficult to predict

The highest temperature above which a gas cannot be liquified no matter how much pressure is applied, is called as

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critical temperature

absolute zero

liquefaction temperature

boiling point

The oxidation of 1 - propanol in the presence of H2SO4, +K2Cr207 produces final product

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Acetaldehyde

Propanal

Acetone

Propanoic acic

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

Benedict solution gives a positive test with

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Glucose

Fructose

Sucrose

Starch

The gasoline with high octane No. has ______

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More knocking

Less knocking

No knocking

Only knocking

Which of the following is a non-typical transition elements

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Cr

Mn

Zn

Fe

The coinage metals are

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Ni, Pd, Pt

Cu, Ag, Au

Zn, Al, Pb

Fe, Si, Sn

The catalytic activity of Pt is much higher when

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It is mixed with asbestos

It is mixed with Pd

It is mixed with arsenic

In is made colloidal platinum

There are 20 amino acids found in protein which is not the property of these amino acids

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They are allα-amino acids

They are all optically active

They have high decomposition point

They are water soluble

How is the secondary structure of protein stabilized

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Through hydrogen bonding

Through ionic bonding

Through van der wall forces

Through covalent bonding

Preparation of vegetable ghee involves

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Halogenations

Hydrogenation

Hydroxylation

Dehydrogenation

Peat contains about

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60% carbon

80% carbon

78% carbon

50% carbon

Which of the following is not related to transition metals

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They have a high tensile strength

They are ductile

They are malleable

They have low melting points

Which represents nucleophilic aromatic substitution reaction?

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Reaction of benzene with Cl₂in sunlight

Benzyl bromide hydrolysis with water

Reaction of NaOH with dintrofluoro benzene

Sulphonation of benzene

Cotton has cellulose in it:

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96%

97%

98%

99%

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