Question # 1

Coenzymes are the species which increase the activity of enzymes. They are chemically

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Metal ions

non-metals

Organic acids

Organic bases

Gases show uniform behavior towards their:

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Internal conditions.

External conditions.

Internal and external conditions.

None of above.

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

A molecule of polysacharide on hydrolysis produces ______ molecules of monosacharide

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2 - 10

3

10

2

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

Glucose forms a polymer which is stored in liver the name of this polymer is:

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glycogen

starch

cellulose

arnylose

For a particular halogen, the reactivity of alkyl halides

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remains same with C-increase

decreases with C-increase

increases with C-increase

decreases with C-decrease

Wt. of 112 ml of oxygen at NTP on liquifaction would be

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0.32 g

0.64 g

0.16 g

0.96 g

If the volume term is present in denominator of Kc expression, then which one is correct

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Increase in pressure will shift the reaction backward

Increase in pressure will shift the reaction forward direction

Decrease in volume will shift the reaction forward direction

Reaction will not effected

Rate of which reaction increases with temperature?

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Exothermic and endothermic reactions

Endothermic reactions

Exothermic reactions

None of these

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

Which one of the following substance is use as decolonizing agent

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Asbestos

Animal charcoal

conc, H₂SO₄

Silica gel

Fe⁺³and Mn²⁺are strong paramagnetic because the number of unpaired electrons in each is

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4

5

6

7

Cotton has cellulose in it:

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96%

97%

98%

99%

Which one of the following gases is used for artificial ripening of fruits

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Ethane

Ethyne

Methane

Propane

Alkyne is :

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CH_3-CH₃

CH₄

CH₂₌CH₂

C₂H₂

Which of the following sets of atomic numbers belong to that of the alkali metals?

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1,12,30,4,62

37,19,3,55

9,17,35,53

12,20,56,88

Enzymes are catalysts which contain other than carbon and hydrogen one other element

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Oxygen

Sulphur

Phosphorus

Iodine

With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because

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Increase in number of collisions

Number of molecules having energy more than Ea is doubled

Increase in order of reaction

Increase in surface area

The protection of steel by chrome plating is due to

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Cathodic protection

Anodic protection

Covering of steel surface

Formation of alloy with iron

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

Organic synthetic or man made polymers are plastics, rubber and fibre. Which is not a synthetic polymer

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Silk

Polyester

Polyvinyl chloride

Nylon

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