Jamb Chemistry 2019 Past Questions and Answers

Question 136:

• JAMB 2019

How many alkoxyalkanes can be obtained from the molecular formula C\(_4\)H\(_{10}\)O?

A. 4
B. 2
C. 1
D. 3

Question 137:

• JAMB 2019

The reaction \(2H_2 S + SO_2 \to 3S + 2H_2 O\) is

A. Not a redox reaction because there is no oxidant in the reaction
B. Not a redox reaction because there is no reductant in the reaction
C. A redox reaction in which H\(_2\)S is the oxidant and SO\(_2\) is the reductant
D. A redox reaction in which SO\(_2\) is the oxidant and H\(_2\)S is the reductant

Question 138:

• JAMB 2019

A solution X, on mixing with AgNO\(_3\) solution gives a white precipitate soluble in aqueous NH\(_3\), a solution Y, when also added to X, also gives a white precipitate which is soluble when heated solutions X and Y respectively contain

A. Al\(^{3+}\), Cl\(^-\)
B. Hg\(^+\), SO\(_4 ^{2-}\)
C. Pb\(^{2+}\), Cl\(^-\)
D. Ag\(^+\), SO\(_4 ^{2-}\)

Question 139:

• JAMB 2019

How many electrons will be found in the nucleus of an atom with mass number 23 and 17 neutrons?

A. None
B. 6
C. 7
D. 8

Question 140:

• JAMB 2019

An element Z contains 80% of \(^{16} _8\)Z and 20% of \(^{18} _8\)Z. Its relative atomic mass is

A. 16.2
B. 17.6
C. 16.0
D. 16.4