Question # 1

The temp. and pressure used for PVC polymerization is

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10°C and 10 atm

20°C and 20 atm

52°C and 9 atm

100°C and 10 atm

Newspaper can be recycled again and again by how many times?

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2

3

4

5

How much quantity of total water is available as fresh water

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3%

1%

10%

21%

The red brown ppt. of Fehling solution and benedict solution tests are of

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Ag

Cu2O

CuO

AgBr

Primar structure of proteins refers to

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Coling and folding in form of specilie structure

3d structure

Number of amino acids in a chain

Alpha and Beta sheets

If internal energy of the system is increased

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Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

All of these

Plastic toys are

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Copolymer

Thermoplastic polymer

Thermosetting polymer

Homopolymer

In gasses and liquid, temperature is the measure of:

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Average transnational kinetic energies of molecules.

Average vibrational kinetic energies of molecules.

Average rotational kinetic energies of molecules.

None of above.

Optimum temperature for enzyme activity is

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125°C

37°C

40°C

100°C

Cotton is an example of

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animal fibre

mineral fibre

vegetable fibre

synthetic fibre

In Case of elements the polymorphism is called

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Isotopic form

Allotropy

Isomorphism

Crystalline forms

In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction

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Electrophilic addition

Electrophilic substitution

Nucleophilic addition

Nucleophilic substitution

If a salt bridge is removed between the two half cells, the voltage

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Drops to zero

Does not change

Increases gradually

Increases rapidly

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Gypsum is applied to the soil to provide calcium and

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Oxygen

Nitrogen

Phosphorous

Sulphur

An electron with n = 3 , l = 2 will be in the sub-shell

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3p

3d

3f

3s

Chlorobenzene on heating with aqueous NH₃under pressure in the presence of cuprous chloride gives

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Benzamide

Nitrobenzene

Aniline

Chloroaminobenzene

Elements in the same family have

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Same atomic number

Molecular wt same

Same chemical properties

Same electronic configuration

Besides Zn and Cu , German silver contains the metal

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Sn

Ag

Ni

Mg

Which of the following reagents is used to distinguish acetone and acetophenone

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NaHSO₃

Grinard reagent

Na₂SO₄

NH₄Cl

Select from the following the one which alcohol

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How many alcohol (including both structural isomers and stereoisomers) can have the molecular formula C₄H₁₀O

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3

4

5

6

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