Question 661:

• 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 662:

• 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 663:

• 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 664:

• 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

Question 665:

• JAMB 1990

What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm³ of 0.05 M acid?

A. 0.05 dm³
B. 0.10 dm³
C. 0.55 dm³
D. 11.0 dm³