Acids, bases and salts - Jamb Chemistry Past Questions and Answers

Question 61:

• JAMB 1990

Which of the following compounds gives a yellow residue when heated and also reacts with aqueous sodium hydroxide to give a white gelatinous precipitate soluble in excess sodium hydroxide solution?

A. (NH₄)CO₃
B. ZnCO₃
C. Al₂(SO₄)₃
D. PbCO[sub][/sub]3

Question 62:

• JAMB 1990

Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?

A. Carbon (IV) oxide
B. Coal tar
C. Charcoal
D. Toxic fumes

Question 63:

• 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 64:

• 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 65:

• JAMB 1991

What volume of CO₂ at s.t.p would be obtained by reacting trioxocarbonate (IV) with excess acid?
(G.M.V at s.t.p = 22.4 dm³)

A. 2.240 cm ³
B. 22.40 cm ³
C. 224.0 cm ³
D. 2240 cm ³