Question # 1

Which one of the following enzymes brings about the hydrolysis of fats?

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Urease

Maltase

Zymase

Lypase

Glyoxal molecule has?

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two carbonyl groups

One aldehydic and one carbonyl group

Two aldehydic groups

Two carboxyl group

Bonding in MgO is an example of

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lonic bond

Polar bond

Covalent bond

Coordination covalent bond

At present the number or cement factories in Pakistan are:

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20

22

25

30

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of:

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2 days

6 days

5 days

7 days

Nitro alkanes exhibit the:

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Chain isomerism

Positional isomerism

Functional group

Metamerism

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

An excellent source of energy without causing pollution is

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Fossil fuel

Sun

Petroleum

Nuclear reactor

The temperature in the incineration of industrial and hazardons waster process had a range

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950 to 1300°C

500 to 900°C

250 to 500°C

900 to 1000°C

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

Amino acids are buildng blocks of:

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protein

Carbohydrates

Lipids

fats

Which compound has the maximum repulsion with water?

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C₆H₆

C₂H₅OH

CH₃CH₂CH₂OH

CH₃----O---CH₃

Stainless steel contains Cr upto

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12%

18%

10%

5%

What is wrong about transition metals?

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Diamagnetic

Paramagnetic

Form complexes

Shows variable oxidation state

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

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Temperature is increased

Pressure is increased

HCl is added

HCl is removed

In Millikan method for determination of charge on electron the air in the chamber is ionized by

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Protons

Electric field

X-rays

a - particles

H-bonding is not present in

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Glycerine

Water

Hydrogen sulphide

Hydrogen fluride

Photons of yellow colour are ______ energetic than violet colour

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More

Less

Equal

None

Borax is a common mineral of alkali metal sodium. Its formula is

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Na₂B₄O₇

Na₂,B₄O₇. 10H₂O

Na₂B₃O₆. 10H₂O

Na₂B₄O₇- 5H₂O

Alcohols of low molecular weight are

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Soluble in water

Soluble in water on heating

Insoluble in water

Insoluble in all solvents

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