Chemical combination - Jamb Chemistry Past Questions and Answers

Question 121:

• 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 122:

• 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 123:

• JAMB 2011

What is the concentration of a solution containing 2g of NaOH in 100cm³ of solution?
[Na = 23, O = 16, H = 1]

A. 0.40 mol dm^-3
B. 0.50 mol dm^-3
C. 0.05 mol dm^-3
D. 0.30 mol dm^-3

Question 124:

• JAMB 2011

What is the concentration of a solution containing 2g of NaOH in 100cm³ of solution?
[Na = 23, O = 16, H = 1]

A. 0.40 mol dm^-3
B. 0.50 mol dm^-3
C. 0.05 mol dm^-3
D. 0.30 mol dm^-3

Question 125:

• 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