Question 721:

• JAMB 1991

The electrons of two atoms Y and Z are arranged in shells as shown above. The bond formed between the atoms of Y and Z is

A. Ionic
B. Covalent
C. Dative
D. Metallic

Question 722:

• JAMB 1991

50 cm³ of sulphur (lV) oxide, 800 cm³ of carbon (IV) oxide will respectively saturate 1.0cm³ of water at 15^oC. Which of the following is suitable for demonstrating the fountain experiment?

A. Sulphur (IV) oxide and hydrogen chloride.
B. Carbon (IV) oxide and ammonia
C. Ammonia and hydrogen chloride
D. Carbon (IV) oxide and Sulphur (IV) oxide

Question 723:

• JAMB 1991

The data in the table above shows the rate of reaction of nitrogen (ll) oxide with chlorine at 25^oC It can be concluded that doubling the initial concentration of NO increase the rate of reaction by a factor of

A. Two
B. Three
C. Four
D. Five

Question 724:

• JAMB 1992

There is a large temperature interval between the melting point and the boiling point of a metal because?

A. Metals have very high melting points
B. Metals conduct heat very repaidly
C. Melting does not break the metalic bond but boiling does
D. The crystal lattice of metals is easily broken

Question 725:

• JAMB 1992

There is a large temperature interval between the melting point and the boiling point of a metal because?

A. Metals have very high melting points
B. Metals conduct heat very repaidly
C. Melting does not break the metalic bond but boiling does
D. The crystal lattice of metals is easily broken