Waec Chemistry Past Questions and Answers

Question 1711:

• WAEC 2021

An element, Q, contains 69% of\(^{63}\)Q and 31% of \(^{65}\)Q. What is the relative atomic mass of Q?

A. 63.0
B. 63.6
C. 65.0
D. 69.0

Question 1712:

• WAEC 2021

The following ions have the same electron configuration except
\(_{8}\)O, \(_{12}\)Mg, \(_{13}\)AI, \(_{17}\)CI

A. CI\(^{-}\)
B. O\(^{2-}\)
C. Mg\(^{2+}\)
D. AI\(^{3+}\)

Question 1713:

• WAEC 2021

The region around the nucleus where electrons can be located is called?

A. A spectra
B. An orbital
C. A quanta
D. A field

Question 1714:

• WAEC 2021

Protons and electrons are called fundamental particles because they ____________

A. Are indivisible
B. Have different charges
C. Are the lightest particles
D. Are found in all matter

Question 1715:

• WAEC 2021

Consider the following energy profile diagram and use it to answer the question that follows



The activation energy of the reaction is

A. E\(_{A}\)
B. E\(_{B}\)
C. E\(_{C}\)
D. E\(_{D}\)