Post Utme Chemistry Past Questions and Answers

Question 1131:

The relationship between the density (d) of a gas and the rate (r) at which the gas diffuses is ____________

A. R=Kd
B. $r=Kd-12$
C. $r=K{d}^{1/2}$
D. $r=K{d}^{-1}$

Question 1132:

The pressure exerted by a sample of a gas confined in $5.86$ $d{m}^3$ container at ${20}^{\circ }C$ is $4.1atm$. What is the number of moles of the gas in the sample?
$(R=0.082d{m}^{3}atm{\text{mol }}^{-}$ $1K^{-1})$

A. $1.00$
B. $2.00$
C. $3.00$
D. $4.00$

Question 1133:

$50c{m}^3$ of hydrogen are sparked with $100c{m}^3$ of oxygen at ${110}^{\circ }C$ and $1atm$. If the whole reaction mixture passes through an alkaline solution pyrogallol, the volume of the residual gas is ____________

A. $125c{m}^3$
B. $100c{m}^3$
C. $75c{m}^3$
D. $50c{m}^3$

Question 1134:

Inter-atomic combinations involve the ____________

A. Neutrons in the nucleus only
B. Protons in the nucleus only
C. Electrons in the outer shell only
D. Electrons in all the shells

Question 1135:

Which of the following is not a characteristic property of ionic compounds?

A. Solubility in polar solvents
B. Low melting points
C. Conduction of electricity in aqueous solution
D. Fast reactions in solution