NECO Past Questions and Answers - Page 78

386.

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.

387.

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.

388.

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.

389.

Two elements X and Y with electronic configurations 2,8,2 and 2,8,7 respectively, are likely to combine by _________bonding

A.

covalent

B.

dative

C.

electrovalent

D.

hydrogen

E.

metallic

Correct answer is C

No explanation has been provided for this answer.

390.

The furring of kettles and boilers are caused by

A.

calcium hydroxide

B.

calcium hydrogen trioxocarbonate (IV)

C.

calcium trioxocarbonate (IV)

D.

calcium tetraoxocarbonate

E.

magnesium tetraoxocarbonate (VI)

Correct answer is C

The furring of kettles or boilers - this is as a result of the decomposition of Ca(HCO3)2 into CaCO3, and this coats the inside of a kettle or boiler used in heating water containing dissolved Ca(HCO3)2.