Waec Chemistry 2006 Past Questions and Answers

Question 1:

• WAEC 2006

How many orbitals are in the d-sub shell?

A. 1
B. 3
C. 5
D. 7

Question 2:

• WAEC 2006

How many orbitals are in the d-sub shell?

A. 1
B. 3
C. 5
D. 7

Question 3:

• WAEC 2006

An element X has isotopic masses of 6 and 7. if the relative abundance is 1 to 12.5 respectively, what is the relative atomic mass of X?

A. 6.0
B. 6.1
C. 6.9
D. 7.0

Question 4:

• WAEC 2006

An atom ²³⁸₉₂X decays by alpha particle emission to give an atom Y. The atomic number and mass number of Y are

A. 90 and 234 respectively
B. 91 and 238 respectively
C. 92 and 236 respectively
D. 93 and 238 respectively

Question 5:

• WAEC 2006

If 1 mole of sodium contains 6 x 10²³ atoms, how many atoms are contained in 0.6 g of sodium? [Na = 23]

A. 1.56 x 10²³
B. 1.56 x 10²²
C. 3.6 x 10²³
D. 3.6 x 10²²