Chemical bonding - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1991

The ions X_- and Y₊ are isoelectronic, each containing a total of 10 electrons.
How many protons are in the nuclei of the neutral atoms of X and Y respectively?

A. 10 and 10
B. 9 and 9
C. 11 and 9
D. 9 and 11

Question 7:

• JAMB 1991

Which of the following represents the type of bonding present in ammonium chloride molecule?

A. Ionic only
B. Covalent only
C. Ionic and dative covalent
D. Dative covalent only

Question 8:

• 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 9:

• JAMB 1993

An element, E, has the electronic configuration 1s²2s²2p⁶3s²p³. The reaction of E with a halogen X can give?

A. EX₃ and EX₅
B. EX₃ only
C. EX₅ only
D. EX₂ and EX₃

Question 10:

• JAMB 1993

Which of the following is a property of ionic chlorides?

A. They can be decomposed by heat
B. They react with aqueous AgNO₃ to give a white precipiate which is soluble in excess ammonia
C. They explode when in contact with dry ammonia
D. They react with concentrated tetraoxosulphate (IV) acid to give white fumes of chlorine gas