Neco Chemistry Past Questions and Answers

Question 91:

• NECO 2008

The reaction of hydrochloric acid and calcium trioxocarbonate (IV) produces

A. Calcium chloride, carbon (IV) oxide and water
B. Calcium chloride, and trioxocarbonate (IV) acid
C. Calcium hydroxide, carbon (IV) oxide and chlorine gas
D. Calcium hydroxide, carbon (IV) oxide and water
E. Calcium metal and water.

Question 92:

• NECO 2008

If two elements X and Z with electronic configurations 2,8.3 and2,8,6 respectively combine, the compound formed will have the formula

A. XZ
B. XZ₂
C. X₂Z
D. X₂Z₃
E. X₃Z₂

Question 93:

• NECO 2008

The following gases are diatomic EXCEPT

A. Fluorine
B. Helium
C. Hydrogen
D. Nitrogen
E. Oxygen

Question 94:

• NECO 2008

Which of these is NOT a physical property f water?

A. Can be used to dissolve organic substances
B. Has a boiling point of 100 ° C
C. Has a density of 19cm3 at 40 °C
D. Has a freezing point of 0 ° C
E. Is neutral to litmus

Question 95:

• NECO 2008

During the electrolysis of sodium Chloride solution, hydrogen is discharged at the carbon cathode because ____________

A. Hydrogen ions are in greater concentration than sodium ions.
B. Hydrogen is higher than sodium in the electrochemical series.
C. Hydrogen is lower than sodium in the electrochemical series.
D. Of the nature of the electrodes.
E. The concentration of sodium ions is greater than that of the hydrogen ion in the electrolyte.