Jamb Chemistry 1983 Past Questions and Answers

Question 26:

• JAMB 1983

In the reactions
(I) H₂ (g) + 1/2O₂(g) → H₂O(l); ∆H = -286 KJ
(II) C(s) + O₂g) → CO₂ (g); ∆H = -406 KJ the equations imply that

A. More heat is absorbed in (l)
B. More heat is absorbed in (ll)
C. Less heat is evolved in (l)
D. Reaction (ll) proceeds faster than (l)
E. Reaction (l) proceeds faster than (ll)

Question 27:

• JAMB 1983

Which of these metals, Mg, Fe, Pb and Cu will dissolve in dilute HCI?

A. All the metals
B. Mg ,Fe and Cu
C. Mg, Fe and Pb
D. Mg and Fe only
E. Mg only

Question 28:

• JAMB 1983

Stainless steel is an alloy of

A. Carbon, iron and lead
B. Carbon, iron and chromium
C. Carbon, iron and copper
D. Carbon, iron and silver
E. Carbon and iron only

Question 29:

• JAMB 1983

Which volume of 0.5 M H ₂SO₄ will exactly neutralize 20 cm ³ of 0.1 M NaOH solution?

A. 2.0 cm ³
B. 5.0 cm ³
C. 6.8 cm ³
D. 8.3 cm ³
E. 10.4 cm ³

Question 30:

• JAMB 1983

Which of the following pair of gases will NOT react further with oxygen at a temperature between 30^oC AND 400^oC

A. SO₂ and NH₃
B. CO₂ and H₂
C. NO₂ and SO₃
D. SO₃ and NO
E. CO and H₂