Question # 1

Helical structure of protein is stabilized by

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Peptide bond

Dipeptide bond

Van der wall's forces

Hydrogen bonding

In Purification of potable water the coagulant used is

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nickel sulpahte

copper sulpahte

barium sulphate

alum

Evaporation occurs at all temperatures and is effected by

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surface area

temperature

intermolecular forces

all of these

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

The high molecular weight materials which yield on hydrolysis the amino acids is called:

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Carbohydrates

Lipids

Fatty acids

Proteins

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

When purely alcoholic solution of sodium/potassiumhydroxide and halogenoalkanes are reacted an alkene is formed, what is the mechanism of reaction?

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Elimination

Debromination

Dehydration

Reduction

Which one of the following is not true relationship

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The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

Which of the following alkyl halides shows higher reactivity?

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R __ F

R __ CI

R __ Br

R __ I

The composition mixture of clay and lime stone in a raw material is:

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75% limestone & 25% clay

15% limestone & 55% clay

25 limestone & 75% clay

55% limestone & 15% clay

The relative lowering of vapour pressure is equal to the mole fraction of the solute is statement of

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Rault law

Henry law

Dalton law

Grahms law

The number of unpaired electrons in ferrous ion ( Z - 26) is

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3

2

4

5

Which compound will not dissolve in H₂O

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C₆H₆

C₂H₅OH

CH₃CH₂CH₂OH

CH₃- OH

By the use of catalysis the energy of activation is

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Decreased

Increased

Not affected

None

UV radiations bring about

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Skin cancer

Mouth cancer

Lung cancer

Liver cancer

Pb has inert pair of electrons:

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One

Two

Three

Four

The condition for standard enthalpy change is

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1 atm 30°C

1 atm 50°C

1 atm 25°C

760 atm 25°C

In the atmosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

The oxidation state of Fe in [Fe(CN)₆]^3-is

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+2

+3

+4

-3

Aromatic hydrocarbons are the derivatives of

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Normal series of paraffins

Alkene

Benzene

Cyclohexane

A suitable solvent should dissolve maximum amount of solute at its boiling point and minimum amount at :

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Freezing point.

Room temperature.

Boiling point.

Sea level temperature.

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