Post Utme Chemistry Past Questions and Answers

Question 46:

Chlorine, bromine and iodine resemble one another since they ____________

A. Dissolve in alkalis
B. React violently with \(\mathrm{H}_{2}\) without heating
C. Displace each other from solutions of their salts
D. Are gases
E. Are liquids

Question 47:

Liquid oxygen may be produced by condensation of air using this coolant

A. Liquid phosphorus
B. Liquid gas
C. Liquid paraffin
D. Liquid nitrogen
E. Butane

Question 48:

One of these is another form of oxygen

A. Hydroxide
B. Ozone
C. Peroxide
D. Sulphoxide
E. Water

Question 49:

One of these metals is not an alkali metal

A. \(K\)
B. \(\mathrm{Cs}\)
C. \(\mathrm{Sr}\)
D. \(\mathrm{Rb}\)
E. \(\mathrm{Fr}\)

Question 50:

One of these reactions represents the laboratory preparation of hydrogen.

A. \(\mathrm{C}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{I}) \rightarrow \quad \mathrm{E}\) \(\mathrm{CO}(\mathrm{g})+\mathrm{H}_{2}(\mathrm{~g})\)
B. \(2 \mathrm{Na}(\mathrm{s})+2 \mathrm{H}_{2} \mathrm{O}(1) \rightarrow 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})\)
C. \(\mathrm{Cu}(\mathrm{s})+\mathrm{H} \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{CuO}(\mathrm{s})+\mathrm{H}_{2}(\mathrm{~g})\)
D. \(2 \mathrm{Al}(\mathrm{s})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{Al}_{2} \mathrm{O}_{3}(\mathrm{~s})+3 \mathrm{H}_{2}(\mathrm{~g})\)
E. \mathrm{Zn}(\mathrm{s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{ZnCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})\)