Jamb Chemistry 1997 Past Questions and Answers

Question 41:

• JAMB 1997

25 cm³ of 0.02 M KOH neutralized 0.03 g of a monobasic organic acid having the general formula C_nH_{2n + 1} COOH. The molecular formula of the acid is?
(C = 12, H = 1, O = 16)

A. HCOOH
B. C₂H₅COOH
C. CH₃COOH
D. C₃H₇COOH

Question 42:

• JAMB 1997

(1 /(2) N_2(g) + (1) / (2)O_2(g) → NO_(g) ∆H° 89 KJ mol^-. If the entropy change for the reaction above at 25°C is 11.8 J mol^-, calculate the change in free energy. ∆G°, for the reaction at 25°C?

A. 88.71 KJ
B. 85.48 KJ
C. -204.00 KJ
D. -3427.40 KJ

Question 43:

• JAMB 1997

Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR. The section PQ indicates that X is

A. A mixture of salts
B. A hydrated salt
C. An ionic salt
D. A pure compound

Question 44:

• JAMB 1997

Use the graph above to answer this question. A sample, X, solid at room temperature, was melted, heated to a temperature of 358 K and allowed to cool as shown in OPQR.The section OP suggests that X is in the

A. Liquid sate
B. Solid/liquid state
C. Solid state
D. Gaseous state

Question 45:

• JAMB 1997

In the diagram above the gas Y could be

A. Hydrogen chloride
B. Oxygen
C. Carbon (IV) oxide
D. Chlorine