JAMB Chemistry Past Questions & Answers - Page 140

697.

Which of the gas laws does the above graph illustrate?

A.

Boyle

B.

Charles

C.

Graham

D.

Gay-Lussac

Correct answer is B

No explanation has been provided for this answer.

698.

In the experiment above, ammonium chloride crystals deposit on the walls of the tube is as a result of

A.

evaporation

B.

recrystallization

C.

sublimation

D.

fractional precipitation

Correct answer is C

No explanation has been provided for this answer.

699.

Use the option above to answer this question. The structure of benzoic acid is

A.

A

B.

B

C.

C

D.

D

Correct answer is D

No explanation has been provided for this answer.

700.

The times taken for iodine to be liberated in the reaction between sodium thiosulphate and hydrochloric acid at various temperature are as follows. These results suggest that

A.

for a 10o rise in temperature, rate of reaction is double

B.

for a 10 o rise in temperature, rate of reaction is halved

C.

time taken for iodine to appear does not depend on temperature

D.

for a 10 o rise in temperature rate of reaction is tripled

Correct answer is B

The iodine liberation process is significantly affected by the amount of acid, that of potassium iodide added, the waiting time for the liberation, and light; therefore, the process plays a key role for the accuracy of the titration results.

for a 10 o rise in temperature, rate of reaction is halved