Jamb Chemistry 1994 Past Questions and Answers

Question 41:

• JAMB 1994

The set-up above would be useful for determining the amount of

A. Oxygen in air
B. Water vapour in air
C. CO₂ in air
D. Arygen in air

Question 42:

• JAMB 1994

The ∆H for the reaction represented by the energy profile above is

A. -100 kJ mol-^-1
B. + 100 kJ mol^-1
C. +50 kJ mol^-1
D. -50 kJ mol^-1

Question 43:

• JAMB 1994

In the diagram above the activation energy is represented by

A. Y - x
B. X
C. X - z
D. Y

Question 44:

• JAMB 1994

2HCL_(ag) + CaCO_3(ag) → CaCL_2(ag) + H₂O₍₁₎ + CO from the reaction above, which of the following curves represents the consumption of calcium trioxocarbonate (IV) as dilute HCL is added to it?

A. L
B. M
C. N
D. P

Question 45:

• JAMB 1994

In the diagram above, R is a mixture of

A. Potassium tetraxochlorate (VII) and concentrated H₂SO₄
B. Potassium trioxochlorate (V) and concentrated H₂SO₄
C. Potassium tetratoxomanganate (VII) and concentrated HCI
D. Manganes (IV) oxide and concentrated HCI