Jamb Chemistry 1987 Past Questions and Answers

Question 31:

• JAMB 1987

An isotope has an atomic number of 17 and a mass number of 36. Which of the following gives the correct number of neutrons and protons in an atom of the isotope?

A. Neutrons 53, Protons 17
B. Neutrons 17, Protons 36
C. Neutrons 19, Protons 17
D. Neutrons 36, Protons 17

Question 32:

• JAMB 1987

An element Z, contained 90% of ¹⁶₈Z and 10% of Z¹⁸₁₈ its relative atomic mass is?

A. 16.0
B. 16.2
C. 17.0
D. 17.8

Question 33:

• JAMB 1987

Use the option above to answer this question. Which is the correct set of results for tests conducted respectively on fresh lime juice and ethanol.

A. A
B. B
C. C
D. D

Question 34:

• JAMB 1987

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 10^o 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