Question 56:

• JAMB 2019

Which of the following factors will speed up the rate of evolution of carbon (iv) oxide in the reaction below?
2HCl + CaCO₃ → CaCl₂ + H₂O + CO₂

A. Increasing the concentration of the acid
B. Increasing the surface area of CaCO₃
C. A and B
D. Reducing the concentration of the acid

Question 57:

• JAMB 2019

The part of the total energy of a system that accounts for the useful work done in a system is known as

A. Enthalpy change
B. None of the above
C. Gibb's free energy
D. Entropy

Question 58:

• 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 59:

• JAMB 2019

How many alkoxyalkanes can be obtained from the molecular formula C₄H₁₀O?

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

Question 60:

• JAMB 2019

The cost of discharging 6.0g of a divalent metal, X from its salt is What is the cost of discharging 9.0g of a trivalent metal, Y from its salt under the same condition?
[X = 63, Y = 27, 1F = 96,500C]

A. N12.00
B. N27.00
C. N63.00
D. N95.00