NECO Chemistry Past Questions & Answers - Page 3

11.

The green house effect is a climatic condition associated with the presence of excess

A.

carbon (II) oxide

B.

carbon (IV) oxide

C.

hydrogen sulphide

D.

nitrogen (II) oxide

E.

oxygen

Correct answer is B

No explanation has been provided for this answer.

12.

Which of the following is a solid at room temperature?

A.

Argon

B.

Bromine

C.

Chlorine

D.

Fluorine

E.

Iodine

Correct answer is E

No explanation has been provided for this answer.

13.

The relationship between equilibrium constant and free energy change is represented as

A.

δ G ° =-nFE °

B.

δG °-RT ln K

C.

δ G °= + RT In k

D.

δG ° = δH – T S

E.

H=TδS

Correct answer is B

No explanation has been provided for this answer.

14.

Non-polar molecules are held together by

A.

co-ordinate bond

B.

covalent bond

C.

electromagnetic force

D.

hydrogen bond

E.

Van der Waals forces

Correct answer is E

No explanation has been provided for this answer.

15.

The Ideal Gas Law is expressed mathematically as

A.

P1 /T1 = P2/T2

B.

P1/V1 = P2V2

C.

PV =nRT

D.

PV =KT

E.

V1/T1 = V2/T2

Correct answer is C

The empirical relationships among the volume, the temperature, the pressure, and the amount of a gas can be combined into the ideal gas law, PV = nRT.