Post Utme Chemistry Past Questions and Answers

Question 676:

What is the molar mass of a substance, If 004 mole of the ____________

A. \(62.5 \mathrm{~g}\)
B. \(40.0 \mathrm{~g}\)
C. \(6.3 \mathrm{~g}\)
D. \(2.5 \mathrm{~g}\)

Question 677:

The colour imparted of a flame by calclum ion ____________

A. Green
B. Blue
C. Bricks
D. Yellow
E. Iilac

Question 678:

In the reaction \(M+N=P: H=+Q K\), which of the following would increase the concentration product?

A. Decreasing the concentration \(\mathrm{N}\)
B. Increasing the concentration P
C. Adding suitable catalyst
D. Decreasing the temperature

Question 679:

\(200 \mathrm{ml}\) each of \(0.1 \mathrm{M}\) solutlon 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
\( (\mathrm{Pb}=207, \mathrm{Cl}=35.5, \mathrm{~N}=14, \mathrm{O}=16)\)

A. \(2.78 \mathrm{~g}\)
B. \(5.56 \mathrm{~g}\)
C. \(8.34\)
D. \(11.0 \mathrm{~g}\)

Question 680:

\(56.00 \mathrm{~cm}\) of a gas at s.t.p weighted \(0.1 \mathrm{~g}\). What is the vapour density of the gas?
(molar volume of a gas at s.t.p \(=22.4 \mathrm{dm}^{3}\) )

A. \(11.00\)
B. \(22.00\)
C. \(33.00\)
D. \(44.00\)