Atomic structure and bonding - Jamb Chemistry Past Questions and Answers

Question 66:

• 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

Question 67:

• JAMB 1994

The shape of ammonia molecule is?

A. Trigonal planar
B. Octahedral
C. Square planar
D. Tetrahedral

Question 68:

• JAMB 1994

The number of electrons in the valence shell of an element of atomic number 14 is?

A. 1
B. 2
C. 3
D. 4

Question 69:

• JAMB 1994

Which of the following physical properties decreases down a group in the periodic table?

A. Atomic radius
B. Ionic radius
C. Electropositivity
D. Electronegativity

Question 70:

• JAMB 1994

Element X, Y and Z belong to a groups I, V and VII respectively. Which of the following is TRUE about the bond types of XZ and YZ₃?

A. Both are electrovalent
B. Both are covalent
C. XZ is electrovalent and YZ₃ is covalent
D. XZ is covalent and YZ₃ is electrovalent