Unit#13: Biochemistry + Ch 14

1

Chemical equilibrium can be achieved in:

A Open system only B Closed system only C Any system D Vacuum

2

Which nutrient is mainly required for energy?

A Proteins B Carbohydrates C Vitamins D Minerals

3

The equilibrium constant (Kc) is expressed in terms of:

A Initial concentrations B Equilibrium concentrations C Rate of reaction D Temperature only

4

Which nutrient is required in small amounts?

A Carbohydrates B Proteins C Fats D Vitamins

5

Chemical industries are important because they:

A Reduce population B Increase unemployment C Provide useful products D Destroy environment only

6

Enzymes speed up reactions by:

A Increasing temperature B Lowering activation energy C Changing products D Increasing pressure

7

Which nutrient is essential for enzyme formation?

A Proteins B Carbohydrates C Lipids D Water

8

Which of the following is an example of environmental chemistry?

A Study of acids B Study of polymers C Study of pollution effects D Study of atomic structure

9

The basic unit of carbohydrates is:

A Fatty acid B Amino acid C Monosaccharide D Nucleotide

10

Denaturation of enzyme is caused by:

A Low temperature B Optimal pH C High temperature D Low substrate

11

Acid rain is mainly caused by oxides of:

A Nitrogen and sulphur B Carbon and hydrogen C Oxygen and nitrogen D Chlorine and fluorine

12

Which enzyme is present in saliva?

A Pepsin B Trypsin C Amylase D Lipase

13

Smog is a mixture of:

A Smoke and fog B Gas and dust C Water and oxygen D Nitrogen and oxygen

14

Which biomolecule provides structural support in plants?

A Starch B Glycogen C Cellulose D Sucrose

15

Natural gas mainly consists of:

A Ethane B Methane C Propane D Butane

16

Which of the following is a strong base?

A NH₄OH B NaOH C Al(OH)₃ D Mg(OH)₂

17

A substance that accepts a proton is known as:

A Bronsted–Lowry base B Arrhenius acid C Lewis acid D Neutral compound

18

The raw material for urea manufacture includes:

A Ammonia and carbon dioxide B Nitrogen and oxygen C Sulphur dioxide D Methane only

19

A substance that can donate a proton is called:

A Lewis acid B Arrhenius base C Bronsted–Lowry acid D Bronsted–Lowry base

20

Which petroleum fraction is used as fuel for cars?

A Kerosene B Petrol C Bitumen D Lubricating oil

21

For a reversible reaction, if Kc is very large, it indicates:

A Reaction favors reactants B Reaction favors products C Reaction is very slow D No reaction occurs

22

The equilibrium constant changes with change in:

A Concentration B Pressure C Temperature D Catalyst

23

Which enzyme breaks down starch into maltose?

A Lipase B Protease C Amylase D Pepsin

24

The main function of fertilizers is to:

A Kill pests B Increase soil fertility C Control pollution D Increase rainfall

25

The pH of acid rain is usually:

A Above 7 B Equal to 7 C Below 7 D Equal to 14