Waec Chemistry 2012 Past Questions and Answers

Question 6:

• WAEC 2012

Two elements, X and Y are in the same group on the periodic table because they both have the same

A. Number of electronic shells
B. Number of valence electrons
C. Atomic size
D. Atomic number

Question 7:

• WAEC 2012

The d-block elements are paramagnetic because they

A. Contain paired electrons which are repelled by magnetic field
B. Contain unpaired electrons in the partially filled 3d-orbital
C. Contain paired electrons which are repelled by magnetic field force
D. Have delocalized valence electrons

Question 8:

• WAEC 2012

Which of the following statements about a radioactive substance is/are correct? l. lt emits radiation continuously and spontaneously. ll. The emitted radiations are affected by temperature and pressure III. The radiation can penetrate opaque matter

A. Ll only
B. L and ll only
C. L and lll only
D. Ll and lll only

Question 9:

• WAEC 2012

Which of the following elements is a metalloid?

A. Carbon
B. Oxygen
C. Silicon
D. Sodium

Question 10:

• WAEC 2012

Which of the following halogens is liquid at room temperature?

A. Chlorine
B. Fluorine
C. Lodine
D. Bromine