Post Utme Chemistry Past Questions and Answers

Question 386:

The rate of production of hydrogen gas from the reaction between zinc granules and hydrochloric acid can be increased by ____________

A. Cooling the reaction mixture
B. Using zinc powder instead of zinc granules.
C. Using zinc rod instead of zinc granules.
D. Carrying out the reaction at a higher pressure.

Question 387:

Nitrogen is prepared on a large scale by the ____________

A. Fractional distillation of liquefied air.
B. Decomposition of ammonium dioxonitrate (iii).
C. Electrolysis of brine.
D. Haber process

Question 388:

Which of the following metals will be the most suitable for use where lightness and resistance to corrosion are of importance?

A. Lead
B. Aluminum
C. Iron.
D. Coppe

Question 389:

The products formed when sodium hydrogen trioxocarbonate (IV) is heated strongly are ____________

A. Carbon (IV) oxide and sodium hydride.
B. Carbon (IV) oxide and sodium trioxocarbonate (IV).
C. Carbon (IV) oxide and steam.
D. Sodium trioxocarbonate (IV), carbon (IV) oxide and steam.

Question 390:

Pipe-borne water is usually chlorinated in order to ____________

A. Improve the taste of the water.
B. Remove the hardness. in the water.
C. Coagulate sediments in the water.
D. Kill harmful bacteria in the water.