Jamb Chemistry Past Questions and Answers

Question 2086:

• JAMB 2019

Which of the following describes the chemical property of acids?

A. None of the above
B. Acid + XCO\(_3\) \(\to\) Salt + H\(_2\)O + NH\(_3\)
C. Acid + NaOH \(\to\) Normal salt + CO\(_2\)
D. Acid + X\(_n\)CO\(_3\) \(\to\) Salt + H\(_2\)O + CO\(_2\)

Question 2087:

• JAMB 2019

Which of the following pairs cannot be represented with a chemical formula?

A. Air and bronze
B. Bronze and sodium chloride
C. Copper and sodium chloride
D. Caustic soda and washing soda

Question 2088:

• JAMB 2019

Consider the equation below:
Cr\(_2\)O\(_7 ^{2-}\) + 6Fe\(^{2+}\) + 14H\(^{+}\) \(\to\) 2Cr\(^{3+}\) + 6Fe\(^{3+}\) + 7H\(_2\)O.
The oxidation number of chromium changes from

A. +5 to +3
B. +6 to +3
C. -2 to +3
D. +7 to +3

Question 2089:

• JAMB 2019

Which of the following is a physical change?

A. Exposing white phosphorus to air
B. Burning kerosene
C. Dissolving calcium in water
D. Freezing ice cream

Question 2090:

• JAMB 2019

In the reaction between sodium hydroxide and tetraoxosulphate (VI) solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralize 10cm\(^3\) of 1.25 molar tetraoxosulphate (vi) acid?

A. 25cm\(^3\)
B. 10cm\(^3\)
C. 20cm\(^3\)
D. 50cm\(^3\)