Post Utme Chemistry Past Questions and Answers

Question 1051:

When water drops are added to calcium carbide in a container and the gas produced is passed through jet and ignited, the resulting flame is called ____________

A. Oxyethane flame
B. Oxyethylene flame
C. Hydrogen flame
D. Oxyacetylene flame

Question 1052:

Brass and bronze are both metallic alloys, which of the following constituents is common to both alloys?

A. Tin
B. Zinc
C. Copper
D. Lead

Question 1053:

In the process of silver plating a metal \(M\), the metal \(M\) is the ____________

A. Anode and a direct current is used
B. Cathode and an alternating current is used
C. Anode and an alternating current is used
D. Cathode and a direct current is used

Question 1054:

The ammonium compound used in the manufacture of dry cell is ____________

A. \(NH _{4} Cl\)
B. \(NH _{4} NO _{3}\)
C. \(\left( NH _{4}\right)_{2} SO _{4}\)
D. \(\left( NH _{4}\right)_{2} NO _{4}\)

Question 1055:

In the extraction of iron in the blast furnace, the role of limestone is to ____________

A. Decompose the iron ore
B. Remove the silicate impurities
C. Convert red hot coke to carbon (IV) oxide
D. Reduce iron ore to iron