Post Utme Chemistry Past Questions and Answers

Question 686:

A gaseous molecule chloride \(\mathrm{MClx}\) consist of \(20.22 \%\) of \(M\) by mass. The formula of the chloride is ____________
\((\mathrm{M}=27, \mathrm{Cl}=35.5)\)

A. \(\mathrm{MCl}\)
B. \(\mathrm{MCl}_{2}\)
C. \(\mathrm{MCl}_{3}\)
D. \(\mathrm{M}_{2} \mathrm{Cl}_{16}\)

Question 687:

In which of the following are water molecule in the most disorderly a management ____________

A. Ice at \(-10^{\circ} \mathrm{C}\)
B. Ice at \(-0^{\circ} \mathrm{C}\)
C. Water at \(-100^{\circ} \mathrm{C}\)
D. Steam at \(-100^{\circ} \mathrm{C}\)

Question 688:

In order of remove one electron from 3 s-orbltal of gaseous sodlum atom, about \(496 \mathrm{KJ} \mathrm{mol}\) mof \(^{-1}\) on engy is require. This energy referred to as ____________

A. Electron affinity
B. Ionizatlon energy
C. Activation energy
D. Electronegativity

Question 689:

Nitrogen obtained from the liquefactlon of air a higher density than that obtained from nitrogen contalning compounds because the former contains ____________

A. Water vapour
B. Oxygen
C. Carbon(iv)oxide
D. Rare gases

Question 690:

The method that can be used to convert hard water to soft water is ____________

A. Chlorination
B. Passage over activated charcoal
C. The use of an ion exchange
D. Aeration