Post Utme Chemistry Past Questions and Answers

Question 1161:

\(70 cm ^{3}\) of hydrogen are sparked with \(25 cm ^{3}\) of oxygen at S.T.P. The total volume of the residual gas is ____________

A. \(20 cm ^{3}\)
B. \(35 cm ^{3}\)
C. \(45 cm ^{3}\)
D. \(25 cm ^{3}\)

Question 1162:

A solution \(X\), on mixing with \(AgNO _{3}\) solution, gives a white precipitate soluble in \(NH _{3}\). A solution \(Y\) when added to \(X\), also gives a white precipitate which is soluble on boiling. Solution \(Y\) contains

A. \(Ag ^{+}\)
B. \(Pb ^{2+}\)
C. \(Pb ^{4+}\)
D. \(Zn ^{2+}\)

Question 1163:

Which of the following is an exception in the assumptions of the kinetic theory of gases?

A. The particles are of negligible size.
B. The particles are in constant random motion
C. The particles are of negligible mass
D. The particles collide with each other

Question 1164:

A saturated solution \(AgCl\) was found to have a concentration of \(1.30 \times 10^{-5} moldm ^{-3}\). The solubility product of \(AgCl\) therefore is

A. \(1.30 \times 10^{-5} mol ^{2} dm ^{-6}\)
B. \(2.60 \times 10^{-12} mol ^{2} dm ^{-6}\)
C. \(1.30 \times 10^{-7} mol ^{2} dm ^{-6}\)
D. \(1.69 \times 10^{-10} mol ^{2} dm ^{-6}\)

Question 1165:

\(0.06 g\) of a hydrocarbon occupies \(32 cm ^{3}\) at S.T.P. Its formula is ____________

A. \(C _{3} H _{6}\)
B. \(C _{2} H _{2}\)
C. \(C _{2} H _{4}\)
D. \(C _{2} H _{6}\)