Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 71:

• JAMB 1993

In the diagram above, curve X represents the energy profile for a homogeneous gaseous reaction. Which of the following conditions would produce curve Y for the same reaction?

A. Increase in temperature
B. Increase in the concentration of a reactant
C. Addition of a catalyst
D. Increase in pressure

Question 72:

• JAMB 1994

Which of the following are produced when ammonium trioxonitrate (V) crystals are cautiously heated in a hard glass round bottomed flask?

A. N₂O and steam
B. NO₂ and ammonia
C. N₂O₂ and NO₂
D. NO and NO₂

Question 73:

• JAMB 1994

Which of these solutions will give a white precipitate with a solution of barium chloride acidified with hydrochloric acid?

A. Sodium trioxocarbonate (IV)
B. Sodium tetraoxosulphate (IV)
C. Sodium trioxosulphate (IV)
D. Sodium sulphide

Question 74:

• 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 75:

• 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