Stoichiometry - Jamb Chemistry Past Questions and Answers

Question 96:

• JAMB 2008

0.05 mol dm^-3 HCl is neutralized by 25 cm³ NaOH. If the volume of acid used is 32.00cm³, what is the concentration of the base

A. 0.016 mol dm^-3
B. 0.032 mol dm^-3
C. 0.039 mol dm^-3
D. 0.064 mol dm^-3

Question 97:

• JAMB 2009

0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 mole of a solution of hydrochloric acid. The volume of gas evolved at s.t.p is
[Molar volume of a gas at s.t.p = 22.4 dm³]

A. 224cm³
B. 168cm³
C. 112cm³
D. 100cm³

Question 98:

• JAMB 2009

If 10.5g of lead (II) trioxonitrate (V) is dissolved in 20cm³ of distilled water at 18^oC, the solubility of the solute in mol dm^-3 is
[Pb = 207, N = 14, O = 16]

A. 1.60
B. 5.25
C. 16.00
D. 525.00

Question 99:

• JAMB 2009

What volume of 1.5M solution of KOH would contain 0.045 moles

A. 67.50 cm³
B. 30.00 cm³
C. 6.75 cm³
D. 3.00 cm³

Question 100:

• JAMB 2012

How many atoms are present in 6.0g of magnesium?
[Mg = 24, N_A = 6.02 x 10²³ mol^-1]

A. 1.20 x 10²²
B. 2.41 x 10²²
C. 1.51 x 10²³
D. 3.02 x 10²³