Jamb Chemistry 1999 Past Questions and Answers

Question 1:

• JAMB 1999

200cm³ each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16]

A. 2.78g
B. 5.56g
C. 8.34g
D. 11.12g

Question 2:

• JAMB 1999

200cm³ each of 0.1M solutions of lead (II) trioxonitrate (V) and hydrochloric acid were mixed. Assuming that lead (II) chloride is completely insoluble, calculate the mass of lead (II) chloride that will be precipitated.
[Pb = 207, Cl= 35.5, N = 14, O = 16]

A. 2.78g
B. 5.56g
C. 8.34g
D. 11.12g

Question 3:

• JAMB 1999

56.00cm³ of a gas at S.T.P. weighed 0.11g. What is the vapour density of the gas?
[Molar volume of a gas at S.T.P = 22.4dm³]

A. 11.00
B. 22.00
C. 33.00
D. 44.00

Question 4:

• JAMB 1999

Which of the following gases will diffuse fastest when passed through a porous plug?
[H = 1, C = 12, N = 14, O = 16]

A. Propane
B. Oxygen
C. Methane
D. Ammonia

Question 5:

• JAMB 1999

Which is the temperature of a given mass of a gas initially at 0°C and 9 atm, if the pressure is reduced to 3 atm at constant volume?

A. 91K
B. 182K
C. 273K
D. 819K