Waec Chemistry 2002 Past Questions and Answers

Question 16:

• WAEC 2002

A hydrogen atom which has lost an electron contains

A. One proton only
B. One neutron only
C. One proton and one neutron
D. One proton, one electronic and one neutron

Question 17:

• WAEC 2002

Which of the following elements has a ground state electronic configuration with an incomplete penultimate shell?

A. Iron
B. Sodium
C. Aluminium
D. Calcium

Question 18:

• WAEC 2002

The conclusion from Rutherford's alpha-scattering experiment is that

A. Atoms are mostly empty space with a small nucleus
B. Emissions from radioactive substances consist of three main components
C. There is nuclear pull on orbital electrons
D. Electrons are deflected by both magnetic and electric fields

Question 19:

• WAEC 2002

An element Y has the electronic configuration 1s²2s²2p⁶6²3p₄. To what period does it belong in the periodic table?

A. 3
B. 4
C. 5
D. 6

Question 20:

• WAEC 2002

If a metal R forms a compound with the formula R(NO₃)² , the formula of its tetraoxosulphate (IV) is

A. R(SO₄)₂
B. RSO₄
C. R₂SO₄
D. R₂(SO₄)₃