Chemistry 1990 Jamb Past Questions and Answers

Question 36 :

• JAMB 1990

The solubility in moles per dm³ of 20g of CuSO₄ dissolve in 100 of water at 180°C is?
(Cu = 63.5, S = 32, O = 16)

A. 0.13
B. 0.25
C. 1.25
D. 2.00

Question 37 :

• JAMB 1990

Smoke consist of?

A. Solid particles dispersed in liquid
B. Solid or liquid particles dispersed in gas
C. Gas or liquid particles dispersed inliquid
D. Liquid particles dispersed inliquid

Question 38 :

• JAMB 1990

Na₂C₂O₄ + CaCl₂ → CaC₂O₄ + 2NaCl. Given a solution of 1.9g of sodium oxalate in 50g of water at room temperature, calculate the minimum volume of 0.1 M calcium oxalate using the above equation?

A. 1.40 χ 10² dm³
B. 14.0 χ 10² cm³
C. 1.40 χ 10^-2 dm^-2
D. 14.0 χ 10^-2 cm³

Question 39 :

• JAMB 1990

2.0g of a monobasic acid was made up to 250 cm³ with distilled water. 25.00 cm³ of this solution required 20.00cm³ of 0.1 M NaOH solution for complete neutralization. The molar mass of the acid is?

A. 200 g
B. 160 g
C. 100 g
D. 50 g

Question 40 :

• JAMB 1990

What is the concentration of H⁺ ions in moles per dm³ of a sodium of pH 4.398?

A. 4.0 χ 10^-5
B. 0.4 χ 10^-5
C. 4.0 χ 10^-3
D. 0.4 χ 10^-3