Question # 1

The crystal system are of

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7 types

10 types

5 types

8 types

S.I units for measurements of pressure

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Pascal

mm of Hg

atm

Torr

Which of the following is the element not present in all proteins

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Carbon

Hydrogen

Nitrogen

Sulphur

Allotropic forms of carbon are:

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five

three

four

two

Chemical equilibrium involving reactants and products in more than one phase is called:

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Homogeneous

Heterogeneous

Dynamic

Static

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges form:

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2ppm - 6ppm

2ppm - 4ppm

4ppm - 8ppm

2ppm - 3ppm

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

Dichlorodifluoromethane, CC/2F2 has been used in aeroso propellants and as a refrigerant.
Which statement helps to explain why dichlorodifluromethane is chemically inert ?

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The carbon-fluorine bond energy is large

The carbon-fluorine bond has a law polarity

Fluorine is highly electronegative

Fluorine compound are non-flammable

Choose the correct statements

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SO₂affects the nucleus

SO₂affects plasmodesmata

SO₂affects cell wall

SO₂affects all membrane systems

The substance upon which an enzyme acts is known as its

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domain

field

substrate

reactant

The polymers which can not be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

The saturated hydrocarbons usually end with suffix ______

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Ane

Ene

Yne

Oic

Electrochemical series is a list of element S arranged into the increasing order of their

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Standard oxidation potential

Standard reduction potential

Cell voltage

Ionization potential

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

Which of the following compounds will not react with sodium metal to release hydrogen

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CH₃CH₂CH₃

CH₃CH₂OH

C₆H₅OH

C₆H₅CH₂OH

Which of the following is a thermosetting plastic

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PVC

Polyethylene

Polystyrene

Melamines

Which of the following derivative can not be prepared directly from acetic acid

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Acetamide

Acetyl chloride

Acetic anhydride

Ethyl acetate

Which structure shows a primary alcohol

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C₁₈and onward hydrocarbons are normally

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Gases

Liquids

Solids

Plasma

White P when boiled with strong solution of caustic soda produces

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Phosphine

Posh acid

Phosphorous acid

None

Which of the following is halo form

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CHBr₃

CHCI₃

CHI₃

All of these

A compound containing carboxyl group in them are called:

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Ketone

Ether

Carboxylic acids

Polycarboxylic acid

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