Post Utme Chemistry Past Questions and Answers

Question 731:

According to Charles's law, the volume of a gas becomes zero at ____________

A. \(0^{\circ} \mathrm{C}\)
B. \(-100^{\circ} \mathrm{C}\)
C. \(-273^{\circ} \mathrm{C}\)
D. \(-373^{\circ} \mathrm{C}\)

Question 732:

The allotrope of carbon used in the decolourization of sugar is.

A. Graphite
B. Soot
C. Charcoal
D. Lampblack

Question 733:

Oxyacetylene flame is used for iron welding because it ____________

A. Makes the iron metal solidify very quickly
B. Combines with oxygen to give a prop sound
C. Evolves a lot of heat when burnt
D. Dissociation to produce carbon (IV) oxide and oxygen

Question 734:

The nucleus of an atom consist of ____________

A. Electrons and neutrons
B. Electrons and protons
C. Protons and neutrons
D. All of the above

Question 735:

The number of moles of solute present in 1kg of a solvent is called its ____________

A. Molality
B. Molarity
C. Normality
D. Formality